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Time to build the networkBelow you'll build your network. We've built out the structure. You'll implement both the forward pass and backwards pass through the network. You'll also set the hyperparameters: the learning rate, the number of hidden units, and the number of training passes.The network has two layers, a hidden layer and an output layer. The hidden layer will use the sigmoid function for activations. The output layer has only one node and is used for the regression, the output of the node is the same as the input of the node. That is, the activation function is $f(x)=x$. A function that takes the input signal and generates an output signal, but takes into account the threshold, is called an activation function. We work through each layer of our network calculating the outputs for each neuron. All of the outputs from one layer become inputs to the neurons on the next layer. This process is called *forward propagation*.We use the weights to propagate signals forward from the input to the output layers in a neural network. We use the weights to also propagate error backwards from the output back into the network to update our weights. This is called *backpropagation*.> **Hint:** You'll need the derivative of the output activation function ($f(x) = x$) for the backpropagation implementation. If you aren't familiar with calculus, this function is equivalent to the equation $y = x$. What is the slope of that equation? That is the derivative of $f(x)$.Below, you have these tasks:1. Implement the sigmoid function to use as the activation function. Set `self.activation_function` in `__init__` to your sigmoid function.2. Implement the forward pass in the `train` method.3. Implement the backpropagation algorithm in the `train` method, including calculating the output error.4. Implement the forward pass in the `run` method.
############# # In the my_answers.py file, fill out the TODO sections as specified ############# from my_answers import NeuralNetwork def MSE(y, Y): return np.mean((y-Y)**2)
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MIT
project-bikesharing/Predicting_bike_sharing_data.ipynb
pasbury/udacity-deep-learning-v2-pytorch
Unit testsRun these unit tests to check the correctness of your network implementation. This will help you be sure your network was implemented correctly befor you starting trying to train it. These tests must all be successful to pass the project.
import unittest inputs = np.array([[0.5, -0.2, 0.1]]) targets = np.array([[0.4]]) test_w_i_h = np.array([[0.1, -0.2], [0.4, 0.5], [-0.3, 0.2]]) test_w_h_o = np.array([[0.3], [-0.1]]) class TestMethods(unittest.TestCase): ########## # Unit tests for data loading ########## def test_data_path(self): # Test that file path to dataset has been unaltered self.assertTrue(data_path.lower() == 'bike-sharing-dataset/hour.csv') def test_data_loaded(self): # Test that data frame loaded self.assertTrue(isinstance(rides, pd.DataFrame)) ########## # Unit tests for network functionality ########## def test_activation(self): network = NeuralNetwork(3, 2, 1, 0.5) # Test that the activation function is a sigmoid self.assertTrue(np.all(network.activation_function(0.5) == 1/(1+np.exp(-0.5)))) def test_train(self): # Test that weights are updated correctly on training network = NeuralNetwork(3, 2, 1, 0.5) network.weights_input_to_hidden = test_w_i_h.copy() network.weights_hidden_to_output = test_w_h_o.copy() network.train(inputs, targets) self.assertTrue(np.allclose(network.weights_hidden_to_output, np.array([[ 0.37275328], [-0.03172939]]))) self.assertTrue(np.allclose(network.weights_input_to_hidden, np.array([[ 0.10562014, -0.20185996], [0.39775194, 0.50074398], [-0.29887597, 0.19962801]]))) def test_run(self): # Test correctness of run method network = NeuralNetwork(3, 2, 1, 0.5) network.weights_input_to_hidden = test_w_i_h.copy() network.weights_hidden_to_output = test_w_h_o.copy() self.assertTrue(np.allclose(network.run(inputs), 0.09998924)) suite = unittest.TestLoader().loadTestsFromModule(TestMethods()) unittest.TextTestRunner().run(suite)
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MIT
project-bikesharing/Predicting_bike_sharing_data.ipynb
pasbury/udacity-deep-learning-v2-pytorch
Training the networkHere you'll set the hyperparameters for the network. The strategy here is to find hyperparameters such that the error on the training set is low, but you're not overfitting to the data. If you train the network too long or have too many hidden nodes, it can become overly specific to the training set and will fail to generalize to the validation set. That is, the loss on the validation set will start increasing as the training set loss drops.You'll also be using a method know as Stochastic Gradient Descent (SGD) to train the network. The idea is that for each training pass, you grab a random sample of the data instead of using the whole data set. You use many more training passes than with normal gradient descent, but each pass is much faster. This ends up training the network more efficiently. You'll learn more about SGD later. Choose the number of iterationsThis is the number of batches of samples from the training data we'll use to train the network. The more iterations you use, the better the model will fit the data. However, this process can have sharply diminishing returns and can waste computational resources if you use too many iterations. You want to find a number here where the network has a low training loss, and the validation loss is at a minimum. The ideal number of iterations would be a level that stops shortly after the validation loss is no longer decreasing. Choose the learning rateThis scales the size of weight updates. If this is too big, the weights tend to explode and the network fails to fit the data. Normally a good choice to start at is 0.1; however, if you effectively divide the learning rate by n_records, try starting out with a learning rate of 1. In either case, if the network has problems fitting the data, try reducing the learning rate. Note that the lower the learning rate, the smaller the steps are in the weight updates and the longer it takes for the neural network to converge. Choose the number of hidden nodesIn a model where all the weights are optimized, the more hidden nodes you have, the more accurate the predictions of the model will be. (A fully optimized model could have weights of zero, after all.) However, the more hidden nodes you have, the harder it will be to optimize the weights of the model, and the more likely it will be that suboptimal weights will lead to overfitting. With overfitting, the model will memorize the training data instead of learning the true pattern, and won't generalize well to unseen data. Try a few different numbers and see how it affects the performance. You can look at the losses dictionary for a metric of the network performance. If the number of hidden units is too low, then the model won't have enough space to learn and if it is too high there are too many options for the direction that the learning can take. The trick here is to find the right balance in number of hidden units you choose. You'll generally find that the best number of hidden nodes to use ends up being between the number of input and output nodes.
import sys #################### ### Set the hyperparameters in you myanswers.py file ### #################### from my_answers import iterations, learning_rate, hidden_nodes, output_nodes N_i = train_features.shape[1] network = NeuralNetwork(N_i, hidden_nodes, output_nodes, learning_rate) losses = {'train':[], 'validation':[]} for ii in range(iterations): # Go through a random batch of 128 records from the training data set batch = np.random.choice(train_features.index, size=128) X, y = train_features.ix[batch].values, train_targets.ix[batch]['cnt'] network.train(X, y) # Printing out the training progress train_loss = MSE(network.run(train_features).T, train_targets['cnt'].values) val_loss = MSE(network.run(val_features).T, val_targets['cnt'].values) sys.stdout.write("\rProgress: {:2.1f}".format(100 * ii/float(iterations)) \ + "% ... Training loss: " + str(train_loss)[:5] \ + " ... Validation loss: " + str(val_loss)[:5]) sys.stdout.flush() losses['train'].append(train_loss) losses['validation'].append(val_loss) plt.plot(losses['train'], label='Training loss') plt.plot(losses['validation'], label='Validation loss') plt.legend() _ = plt.ylim()
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MIT
project-bikesharing/Predicting_bike_sharing_data.ipynb
pasbury/udacity-deep-learning-v2-pytorch
Check out your predictionsHere, use the test data to view how well your network is modeling the data. If something is completely wrong here, make sure each step in your network is implemented correctly.
fig, ax = plt.subplots(figsize=(8,4)) mean, std = scaled_features['cnt'] predictions = network.run(test_features).T*std + mean ax.plot(predictions[0], label='Prediction') ax.plot((test_targets['cnt']*std + mean).values, label='Data') ax.set_xlim(right=len(predictions)) ax.legend() dates = pd.to_datetime(rides.ix[test_data.index]['dteday']) dates = dates.apply(lambda d: d.strftime('%b %d')) ax.set_xticks(np.arange(len(dates))[12::24]) _ = ax.set_xticklabels(dates[12::24], rotation=45)
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MIT
project-bikesharing/Predicting_bike_sharing_data.ipynb
pasbury/udacity-deep-learning-v2-pytorch
if 5 > 2: print("Five is greater then two!") #Comment print("Hello World") b = "sally" b = int(4) print(b) b = float(4) print(b) x = 5 y = "John" print(type(x)) print(type(y)) x, y, z = "one", "two", "three" print(x) print(y) print(z) x = y = z = "four" print(x) print(y) print(z) x = "enjoying" y = "Python is " z = y + x print("Python programming is " + x) print(z) x = 5 y = 3 print(x + y) sum = x+ y sum a, b, c = 0, -1, 6 c %= 3 c a, b, c = 0, -1, 6 a>b and c>b True a, b, c = 0, -1, 6 a is c False
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Apache-2.0
Fundamentals_of_Python.ipynb
momonts/OOP-58001
**Searching**Given our experience in thinking about computational complexity and correctness, I think we're ready to start thinking about a couple classic *algorithms* and problems.This week we will start with *searching*, and then move on to *sorting*We'll talk about:1. What we mean by searching2. How quickly can we search a list when we don't know anything about the list?3. When can we do better?4. Starting to define our faster algorithm - binary searchWhat do we mean by searching?Searching in general in computing means lots of different things - we'll be talking about the question: given a data structure and an item - is the item in the data structure? We will mostly talk about looking for items in lists, occasionally in dictionaries. Let's start with this version of the question: Given a list and an item, return the index of the item if it is in the list, otherwise return -1.Warm-up: write a function to do this.
def simpleSearch(myList, item): for i in range(len(myList)): if myList[i] == item: return i return -1 Complexity of this is O(n)
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BSD-3-Clause
cycle_6_searching/previous_years/Friday21stWed26_February_Searching (1).ipynb
magicicada/cs1px_2020
Exercise: What is the big-O time complexity of this algorithm? Can we do better? If not, why not? We can do better when we know the list is in sorted order. Example: (in class) the guessing game - trace an example. Example: (trace together on visualiser) searching in an alphabetically ordered list - looking for *cat* in the list:
wordsList = ['android', 'badger', 'cat', 'door', 'ending', 'firefighter', 'garage', 'handle', 'iguana', 'jumper', 'kestrel', 'lemon']
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BSD-3-Clause
cycle_6_searching/previous_years/Friday21stWed26_February_Searching (1).ipynb
magicicada/cs1px_2020
In-class exercise: Now, as an individual/group exercise, trace this method looking for 'handle' We have essentially been performing **binary search**. The idea is simple, but the implementation is very tricky! We will look at two implementations: one iterative, one recursive.
def iterative_binary_search(my_list, value): lo= 0 hi = len(my_list)-1 while lo <= hi: mid = (lo + hi) // 2 if my_list[mid] < value: lo = mid + 1 elif value < my_list[mid]: hi = mid - 1 else: return mid return -1
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BSD-3-Clause
cycle_6_searching/previous_years/Friday21stWed26_February_Searching (1).ipynb
magicicada/cs1px_2020
Let's trace the operation of this code when called with:
iterative_binary_search([-3, 1, 0, 19, 20, 22, 32], 22)
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BSD-3-Clause
cycle_6_searching/previous_years/Friday21stWed26_February_Searching (1).ipynb
magicicada/cs1px_2020
Binary search can also be implemented recursively. I would like you to be familiar with both the iterative and the recursive versions.Let's try to translate from our iterative version to a recursive version. Look at the iterative version. Where might recursive calls go? Think back to the tracing - where might we have done recursive calls?
def binary_search(my_list, lo, hi, value): if len(my_list) < 1: return -1 if lo > hi: return -1 mid = lo + hi // 2 mid_value = my_list[mid] if mid_value == value: return mid elif mid_value < value: return binary_search(my_list, mid + 1, hi, value) else: return binary_search(my_list, lo, mid - 1, value)
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BSD-3-Clause
cycle_6_searching/previous_years/Friday21stWed26_February_Searching (1).ipynb
magicicada/cs1px_2020
In lecture we will inspect this code very carefully!Let's trace it with a call of:
my_list = [-3, 1, 0, 19, 20, 22, 32] def simplerBinary(myList, value): if len(myList) < 1: return None if len(myList) == 1 and myList[0] != value: return None mid = (len(myList)-1)//2 mid_value = myList[mid] if mid_value == value: return mid elif mid_value < value: new_list = myList[mid+1:] downward = simplerBinary(new_list, value) if downward != None: return mid +1 + downward else: return None else: new_list = myList[:mid] return simplerBinary(new_list, value) my_list = [-3, 0, 1, 19, 20, 22, 32] print(simplerBinary(my_list, 19))
3
BSD-3-Clause
cycle_6_searching/previous_years/Friday21stWed26_February_Searching (1).ipynb
magicicada/cs1px_2020
Temporal-Difference MethodsIn this notebook, you will write your own implementations of many Temporal-Difference (TD) methods.While we have provided some starter code, you are welcome to erase these hints and write your code from scratch.--- Part 0: Explore CliffWalkingEnvWe begin by importing the necessary packages.
import sys import gym import numpy as np from collections import defaultdict, deque import matplotlib.pyplot as plt %matplotlib inline import check_test from plot_utils import plot_values
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MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
Use the code cell below to create an instance of the [CliffWalking](https://github.com/openai/gym/blob/master/gym/envs/toy_text/cliffwalking.py) environment.
env = gym.make('CliffWalking-v0')
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MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
The agent moves through a $4\times 12$ gridworld, with states numbered as follows:```[[ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], [12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23], [24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35], [36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47]]```At the start of any episode, state `36` is the initial state. State `47` is the only terminal state, and the cliff corresponds to states `37` through `46`.The agent has 4 potential actions:```UP = 0RIGHT = 1DOWN = 2LEFT = 3```Thus, $\mathcal{S}^+=\{0, 1, \ldots, 47\}$, and $\mathcal{A} =\{0, 1, 2, 3\}$. Verify this by running the code cell below.
print(env.action_space) print(env.observation_space)
Discrete(4) Discrete(48)
MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
In this mini-project, we will build towards finding the optimal policy for the CliffWalking environment. The optimal state-value function is visualized below. Please take the time now to make sure that you understand _why_ this is the optimal state-value function._**Note**: You can safely ignore the values of the cliff "states" as these are not true states from which the agent can make decisions. For the cliff "states", the state-value function is not well-defined._
# define the optimal state-value function V_opt = np.zeros((4,12)) V_opt[0:13][0] = -np.arange(3, 15)[::-1] V_opt[0:13][1] = -np.arange(3, 15)[::-1] + 1 V_opt[0:13][2] = -np.arange(3, 15)[::-1] + 2 V_opt[3][0] = -13 plot_values(V_opt)
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MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
Part 1: TD Control: SarsaIn this section, you will write your own implementation of the Sarsa control algorithm.Your algorithm has four arguments:- `env`: This is an instance of an OpenAI Gym environment.- `num_episodes`: This is the number of episodes that are generated through agent-environment interaction.- `alpha`: This is the step-size parameter for the update step.- `gamma`: This is the discount rate. It must be a value between 0 and 1, inclusive (default value: `1`).The algorithm returns as output:- `Q`: This is a dictionary (of one-dimensional arrays) where `Q[s][a]` is the estimated action value corresponding to state `s` and action `a`.Please complete the function in the code cell below.(_Feel free to define additional functions to help you to organize your code._)
Q = defaultdict(lambda: np.zeros(env.nA)) Q[36] def get_probs(Q_s, epsilon, nA): """ obtains the action probabilities corresponding to epsilon-greedy policy """ policy_s = np.ones(nA) * epsilon / nA best_a = np.argmax(Q_s) policy_s[best_a] = 1 - epsilon + (epsilon / nA) return policy_s def update_Q_sarsa(alpha, gamma, Q, state, action, reward, next_state=None, next_action=None): """Returns updated Q-value for the most recent experience.""" current = Q[state][action] # estimate in Q-table (for current state, action pair) # get value of state, action pair at next time step Qsa_next = Q[next_state][next_action] if next_state is not None else 0 target = reward + (gamma * Qsa_next) # construct TD target new_value = current + (alpha * (target - current)) # get updated value return new_value def sarsa(env, num_episodes, alpha, gamma=1.0, eps_start=1.0, eps_min=0.0001,plot_every=100): # initialize action-value function (empty dictionary of arrays) nA = env.action_space.n Q = defaultdict(lambda: np.zeros(env.nA)) # initialize performance monitor # monitor performance tmp_scores = deque(maxlen=plot_every) # deque for keeping track of scores avg_scores = deque(maxlen=num_episodes) # average scores over every plot_every episodes # loop over episodes epsilon = eps_start for i_episode in range(1, num_episodes+1): # monitor progress if i_episode % 100 == 0: print("\rEpisode {}/{}".format(i_episode, num_episodes), end="") sys.stdout.flush() ## TODO: complete the function #epsilon = max(epsilon/i_episode, eps_min) epsilon = epsilon/i_episode state = env.reset() action = np.random.choice(np.arange(nA), p=get_probs(Q[state], epsilon, nA)) \ if state in Q else env.action_space.sample() score = 0 while True: next_state, reward, done, info = env.step(action) score += reward if not done: next_action = np.random.choice(np.arange(nA), p=get_probs(Q[next_state], epsilon, nA)) \ if state in Q else env.action_space.sample() Q[state][action] = update_Q_sarsa(alpha, gamma, Q, \ state, action, reward, next_state, next_action) state = next_state action = next_action if done: Q[state][action] = update_Q_sarsa(alpha, gamma, Q, \ state, action, reward) tmp_scores.append(score) break if (i_episode % plot_every == 0): avg_scores.append(np.mean(tmp_scores)) #policy = dict((k,np.argmax(v)) for k, v in Q.items()) # plot performance plt.plot(np.linspace(0,num_episodes,len(avg_scores),endpoint=False), np.asarray(avg_scores)) plt.xlabel('Episode Number') plt.ylabel('Average Reward (Over Next %d Episodes)' % plot_every) plt.show() # print best 100-episode performance print(('Best Average Reward over %d Episodes: ' % plot_every), np.max(avg_scores)) return Q
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MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
Use the next code cell to visualize the **_estimated_** optimal policy and the corresponding state-value function. If the code cell returns **PASSED**, then you have implemented the function correctly! Feel free to change the `num_episodes` and `alpha` parameters that are supplied to the function. However, if you'd like to ensure the accuracy of the unit test, please do not change the value of `gamma` from the default.
# obtain the estimated optimal policy and corresponding action-value function Q_sarsa = sarsa(env, 5000, .01) # print the estimated optimal policy policy_sarsa = np.array([np.argmax(Q_sarsa[key]) if key in Q_sarsa else -1 for key in np.arange(48)]).reshape(4,12) check_test.run_check('td_control_check', policy_sarsa) print("\nEstimated Optimal Policy (UP = 0, RIGHT = 1, DOWN = 2, LEFT = 3, N/A = -1):") print(policy_sarsa) # plot the estimated optimal state-value function V_sarsa = ([np.max(Q_sarsa[key]) if key in Q_sarsa else 0 for key in np.arange(48)]) plot_values(V_sarsa)
Episode 5000/5000
MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
Part 2: TD Control: Q-learningIn this section, you will write your own implementation of the Q-learning control algorithm.Your algorithm has four arguments:- `env`: This is an instance of an OpenAI Gym environment.- `num_episodes`: This is the number of episodes that are generated through agent-environment interaction.- `alpha`: This is the step-size parameter for the update step.- `gamma`: This is the discount rate. It must be a value between 0 and 1, inclusive (default value: `1`).The algorithm returns as output:- `Q`: This is a dictionary (of one-dimensional arrays) where `Q[s][a]` is the estimated action value corresponding to state `s` and action `a`.Please complete the function in the code cell below.(_Feel free to define additional functions to help you to organize your code._)
def q_learning(env, num_episodes, alpha, gamma=1.0, eps_start=1.0,eps_decay=0.9, eps_min=0.001,plot_every=100): # initialize empty dictionary of arrays nA = env.action_space.n Q = defaultdict(lambda: np.zeros(env.nA)) # monitor performance tmp_scores = deque(maxlen=plot_every) # deque for keeping track of scores avg_scores = deque(maxlen=num_episodes) # average scores over every plot_every episodes # loop over episodes epsilon = eps_start for i_episode in range(1, num_episodes+1): # monitor progress if i_episode % 100 == 0: print("\rEpisode {}/{}".format(i_episode, num_episodes), end="") sys.stdout.flush() ## TODO: complete the function epsilon = max(epsilon*eps_decay, eps_min) #epsilon = epsilon/i_episode state = env.reset() action = np.random.choice(np.arange(nA), p=get_probs(Q[state], epsilon, nA)) \ if state in Q else env.action_space.sample() score = 0 while True: next_state, reward, done, info = env.step(action) score += reward if not done: old_Q = Q[state][action] target = reward + gamma*np.max(Q[next_state]) Q[state][action] = old_Q + alpha*(target - old_Q) state = next_state action = np.random.choice(np.arange(nA), p=get_probs(Q[state], epsilon, nA)) \ if state in Q else env.action_space.sample() if done: old_Q = Q[state][action] target = reward Q[state][action] = old_Q + alpha*(target - old_Q) tmp_scores.append(score) break if (i_episode % plot_every == 0): avg_scores.append(np.mean(tmp_scores)) #policy = dict((k,np.argmax(v)) for k, v in Q.items()) # plot performance plt.plot(np.linspace(0,num_episodes,len(avg_scores),endpoint=False), np.asarray(avg_scores)) plt.xlabel('Episode Number') plt.ylabel('Average Reward (Over Next %d Episodes)' % plot_every) plt.show() # print best 100-episode performance print(('Best Average Reward over %d Episodes: ' % plot_every), np.max(avg_scores)) return Q
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MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
Use the next code cell to visualize the **_estimated_** optimal policy and the corresponding state-value function. If the code cell returns **PASSED**, then you have implemented the function correctly! Feel free to change the `num_episodes` and `alpha` parameters that are supplied to the function. However, if you'd like to ensure the accuracy of the unit test, please do not change the value of `gamma` from the default.
# obtain the estimated optimal policy and corresponding action-value function Q_sarsamax = q_learning(env, 5000, .01) # print the estimated optimal policy policy_sarsamax = np.array([np.argmax(Q_sarsamax[key]) if key in Q_sarsamax else -1 for key in np.arange(48)]).reshape((4,12)) check_test.run_check('td_control_check', policy_sarsamax) print("\nEstimated Optimal Policy (UP = 0, RIGHT = 1, DOWN = 2, LEFT = 3, N/A = -1):") print(policy_sarsamax) # plot the estimated optimal state-value function plot_values([np.max(Q_sarsamax[key]) if key in Q_sarsamax else 0 for key in np.arange(48)])
Episode 5000/5000
MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
Part 3: TD Control: Expected SarsaIn this section, you will write your own implementation of the Expected Sarsa control algorithm.Your algorithm has four arguments:- `env`: This is an instance of an OpenAI Gym environment.- `num_episodes`: This is the number of episodes that are generated through agent-environment interaction.- `alpha`: This is the step-size parameter for the update step.- `gamma`: This is the discount rate. It must be a value between 0 and 1, inclusive (default value: `1`).The algorithm returns as output:- `Q`: This is a dictionary (of one-dimensional arrays) where `Q[s][a]` is the estimated action value corresponding to state `s` and action `a`.Please complete the function in the code cell below.(_Feel free to define additional functions to help you to organize your code._)
def update_Q_expected_sarsa(alpha, gamma,epsilon,nA, Q, state, action, reward, next_state): """Returns updated Q-value for the most recent experience.""" current = Q[state][action] # estimate in Q-table (for current state, action pair) # get value of state, action pair at next time step policy_s=get_probs(Q[state], epsilon, nA) Qsa_next = np.dot(Q[next_state], policy_s) target = reward + (gamma * Qsa_next) # construct TD target new_value = current + (alpha * (target - current)) # get updated value return new_value def expected_sarsa(env, num_episodes, alpha, gamma=1.0,eps_start=1.0,eps_decay=0.9, eps_min=0.005,plot_every=100): nA = env.action_space.n Q = defaultdict(lambda: np.zeros(env.nA)) # monitor performance tmp_scores = deque(maxlen=plot_every) # deque for keeping track of scores avg_scores = deque(maxlen=num_episodes) # average scores over every plot_every episodes # loop over episodes #epsilon = eps_start epsilon = 0.005 for i_episode in range(1, num_episodes+1): # monitor progress if i_episode % 100 == 0: print("\rEpisode {}/{}".format(i_episode, num_episodes), end="") sys.stdout.flush() ## TODO: complete the function #epsilon = max(epsilon*eps_decay, eps_min) #epsilon = epsilon/i_episode state = env.reset() action = np.random.choice(np.arange(nA), p=get_probs(Q[state], epsilon, nA)) \ if state in Q else env.action_space.sample() score = 0 while True: next_state, reward, done, info = env.step(action) score += reward Q[state][action] = update_Q_expected_sarsa(alpha, gamma,epsilon,nA, Q, state, action, reward, next_state) state = next_state action = np.random.choice(np.arange(nA), p=get_probs(Q[state], epsilon, nA)) \ if state in Q else env.action_space.sample() if done: tmp_scores.append(score) break if (i_episode % plot_every == 0): avg_scores.append(np.mean(tmp_scores)) #policy = dict((k,np.argmax(v)) for k, v in Q.items()) # plot performance plt.plot(np.linspace(0,num_episodes,len(avg_scores),endpoint=False), np.asarray(avg_scores)) plt.xlabel('Episode Number') plt.ylabel('Average Reward (Over Next %d Episodes)' % plot_every) plt.show() # print best 100-episode performance print(('Best Average Reward over %d Episodes: ' % plot_every), np.max(avg_scores)) return Q
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MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
Use the next code cell to visualize the **_estimated_** optimal policy and the corresponding state-value function. If the code cell returns **PASSED**, then you have implemented the function correctly! Feel free to change the `num_episodes` and `alpha` parameters that are supplied to the function. However, if you'd like to ensure the accuracy of the unit test, please do not change the value of `gamma` from the default.
# obtain the estimated optimal policy and corresponding action-value function Q_expsarsa = expected_sarsa(env, 5000, 0.5) # print the estimated optimal policy policy_expsarsa = np.array([np.argmax(Q_expsarsa[key]) if key in Q_expsarsa else -1 for key in np.arange(48)]).reshape(4,12) check_test.run_check('td_control_check', policy_expsarsa) print("\nEstimated Optimal Policy (UP = 0, RIGHT = 1, DOWN = 2, LEFT = 3, N/A = -1):") print(policy_expsarsa) # plot the estimated optimal state-value function plot_values([np.max(Q_expsarsa[key]) if key in Q_expsarsa else 0 for key in np.arange(48)])
Episode 5000/5000
MIT
temporal-difference/Temporal_Difference.ipynb
laljarus/deep-reinforcement-learning
Pandas
import pandas as pd
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We introduced the Pandas module and the DataFrame object in the lesson on [basic data science modules](DS_Basic_DS_Modules.ipynb). We learned how to construct a DataFrame, add data, retrieve data, and [basic reading and writing to disk](DS_IO.ipynb). Now we'll explore the DataFrame object and its powerful analysis methods in more depth.We'll work with a data set from the online review site, Yelp. The file is stored as a compressed JSON file.
!ls -lh ./data/yelp.json.gz import gzip import simplejson as json with gzip.open('./data/yelp.json.gz', 'r') as f: yelp_data = [json.loads(line) for line in f] yelp_df = pd.DataFrame(yelp_data) yelp_df.head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Pandas DataFrame and SeriesThe Pandas DataFrame is a highly structured object. Each row corresponds with some physical entity or event. We think of all of the information in a given row as referring to one object (e.g. a business). Each column contains one type of data, both semantically (e.g. names, counts of reviews, star ratings) and syntactically.
yelp_df.dtypes
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We can reference the columns by name, like we would with a `dict`.
yelp_df['city'].head() type(yelp_df['city'])
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
An individual column is a Pandas `Series`. A `Series` has a `name` and a `dtype` (similar to a NumPy array). A `DataFrame` is essentially a `dict` of `Series` objects. The `Series` has an `index` attribute, which label the rows. The index is essentially a set of keys for referencing the rows. We can have an index composed of numbers, strings, timestamps, or any hashable Python object. The index will also have homogeneous type.
yelp_df['city'].index
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
The `DataFrame` has an `index` given by the union of indices of its constituent `Series` (we'll explore this later in more detail). Since a `DataFrame` is a `dict` of `Series`, we can select a column and then a row using square bracket notation, but not the reverse (however, the `loc` method works around this).
# this works yelp_df['city'][100] %%expect_exception KeyError # this doesn't yelp_df[100]['city'] yelp_df.loc[100, 'city']
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Understanding the underlying structure of the `DataFrame` object as a `dict` of `Series` will help you avoid errors and help you think about how the `DataFrame` should behave when we begin doing more complicated analysis.We can _aggregate_ data in a `DataFrame` using methods like `mean`, `sum`, `count`, and `std`. To view a collection of summary statistics for each column we can use the `describe` method.
yelp_df.describe()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
The utility of a DataFrame comes from its ability to split data into groups, using the `groupby` method, and then perform custom aggregations using the `apply` or `aggregate` method. This process of splitting the data into groups, applying an aggregation, and then collecting the results is [discussed in detail in the Pandas documentation](https://pandas.pydata.org/pandas-docs/stable/groupby.html), and is one of the main focuses of this notebook. DataFrame constructionSince a `DataFrame` is a `dict` of `Series`, the natural way to construct a `DataFrame` is to use a `dict` of `Series`-like objects.
from string import ascii_letters, digits import numpy as np import datetime usernames = ['alice36', 'bob_smith', 'eve'] passwords = [''.join(np.random.choice(list(ascii_letters + digits), 8)) for x in range(3)] creation_dates = [datetime.datetime.now().date() - datetime.timedelta(int(x)) for x in np.random.randint(0, 1500, 3)] usernames passwords creation_dates df = pd.DataFrame({'username': usernames, 'password': passwords, 'date-created': pd.to_datetime(creation_dates)}) df df.dtypes
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
The `DataFrame` is also closely related to the NumPy `ndarray`.
random_data = np.random.random((4,3)) random_data df_random = pd.DataFrame(random_data, columns=['a', 'b', 'c']) df_random
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
To add a new column or row, we simply use `dict`-like assignment.
emails = ['[email protected]', '[email protected]', '[email protected]'] df['email'] = emails df # loc references index value, NOT position # for position use iloc df.loc[3] = ['2015-01-29', '38uzFJ1n', 'melvintherobot', '[email protected]'] df
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We can also drop columns and rows.
df.drop(3) # to drop a column, need axis=1 df.drop('email', axis=1)
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Notice when we dropped the `'email'` column, the row at index 3 was in the `DataFrame`, even though we just dropped it! Most operations in Pandas return a _copy_ of the `DataFrame`, rather than modifying the `DataFrame` object itself. Therefore, in order to permanently alter the `DataFrame`, we either need to reassign the `df` variable, or use the `inplace` keyword.
df.drop(3, inplace=True) df
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Since the `index` and column names are important for interacting with data in the DataFrame, we should make sure to set them to useful values. We can do this during construction or after.
df = pd.DataFrame({'email': emails, 'password': passwords, 'date-created': creation_dates}, index=usernames) df.index.name = 'users' # it can be helpful to give the index a name df # alternatively df = pd.DataFrame(list(zip(usernames, emails, passwords, creation_dates))) df df.columns = ['username', 'email', 'password', 'date-created'] df.set_index('username', inplace=True) df # to reset index to a column df.reset_index(inplace=True) df
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We can have multiple levels to an index. We'll discover that for some data sets it is necessary to have multiple levels to the index in order to uniquely identify a row.
df.set_index(['username', 'email'])
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Reading data from fileWe can also construct a DataFrame using data stored in a file or received from a website. The data source might be [JSON](https://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_json.html), [HTML](https://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_html.html), [CSV](http://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_csv.htmlpandas.read_csv), [Excel](https://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_excel.html), [Python pickle](https://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_pickle.html), or even a [database connection](https://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_sql.html). Each format will have its own methods for reading and writing data that take different arguments. The arguments of these methods usually depend on the particular formatting of the file. For example, the values in a CSV might be separate by commas or semi-colons, it might have a header or it might not.The `read_csv` method has to deal with the most formatting possibilities, so we will explore that method with a few examples. Try to apply these ideas when working with other file formats, but keep in mind that each format and read method is different. Always check [the Pandas documentation](http://pandas.pydata.org/pandas-docs/stable/io.html) when having trouble with reading or writing data.
csv = [','.join(map(lambda x: str(x), row)) for row in np.vstack([df.columns, df])] with open('./data/read_csv_example.csv', 'w') as f: [f.write(line + '\n') for line in csv] !cat ./data/read_csv_example.csv csv pd.read_csv('./data/read_csv_example.csv') # we can also set an index from the data pd.read_csv('./data/read_csv_example.csv', index_col=0) # what if our data had no header? with open('./data/read_csv_noheader_example.csv', 'w') as f: [f.write(line + '\n') for i, line in enumerate(csv) if i != 0] !cat ./data/read_csv_noheader_example.csv pd.read_csv('./data/read_csv_noheader_example.csv', names=['username', 'email', 'password', 'date-created'], header=None) # what if our data was tab-delimited? tsv = ['\t'.join(map(lambda x: str(x), row)) for row in np.vstack([df.columns, df])] with open('./data/read_csv_example.tsv', 'w') as f: [f.write(line + '\n') for line in tsv] !cat ./data/read_csv_example.tsv pd.read_csv('./data/read_csv_example.tsv', delimiter='\t')
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Even within a single file format, data can be arranged and formatted in many ways. These have been just a few examples of the kinds of arguments you might need to use with `read_csv` in order to read data into a DataFrame in an organized way. Filtering DataFramesOne of the powerful analytical tools of the Pandas DataFrame is its syntax for filtering data. Often we'll only want to work with a certain subset of our data based on some criteria. Let's look at our Yelp data for an example.
yelp_df.head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We see the Yelp data set has a `'state'` column. If we are only interested in businesses in Arizona (AZ), we can filter the DataFrame and select only that data.
az_yelp_df = yelp_df[yelp_df['state'] == 'AZ'] az_yelp_df.head() az_yelp_df['state'].unique()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We can combine criteria using logic. What if we're only interested in businesses with more than 10 reviews in Arizona?
yelp_df[(yelp_df['state'] == 'AZ') & (yelp_df['review_count'] > 10)].head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
How does this filtering work?When we write `yelp_df['state'] == 'AZ'`, Pandas selects the `'state'` column and checks whether each row is `'AZ'`. If so, that row is marked `True`, and if not, it is marked `False`. This is how we would normally expect a conditional to work, only now applied to an entire Pandas `Series`. We end up with a Pandas `Series` of Boolean variables.
(yelp_df['state'] == 'AZ').head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We can use a `Series` (or any similar object) of Boolean variables to index the DataFrame.
df df[[True, False, True]]
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
This let's us filter a DataFrame using idiomatic logical expressions like `yelp_df['review_count'] > 10`.As another example, let's consider the `'open'` column, which is a `True`/`False` flag for whether a business is open. This is also a Boolean Pandas `Series`, so we can just use it directly.
# the open businesses yelp_df[yelp_df['open']].head() # the closed businesses yelp_df[~yelp_df['open']].head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Notice in an earlier expression we wrote `(yelp_df['state'] == 'AZ') & (yelp_df['review_count'] > 10)`. Normally in Python we use the word `and` when we are working with logic. In Pandas we have to use _bit-wise_ logical operators; all that's important to know is the following equivalencies:`~` = `not` `&` = `and` `|` = `or` We can also use Panda's built-in [string operations](https://pandas.pydata.org/pandas-docs/stable/text.html) for doing pattern matching. For example, there are a lot of businesses in Las Vegas in our data set. However, there are also businesses in 'Las Vegas East' and 'South Las Vegas'. To get all of the Las Vegas businesses I might do the following.
vegas_yelp_df = yelp_df[yelp_df['city'].str.contains('Vegas')] vegas_yelp_df.head() vegas_yelp_df['city'].unique()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Applying functions and data aggregationTo analyze the data in the dataframe, we'll need to be able to apply functions to it. Pandas has many mathematical functions built in already, and DataFrames and Series can be passed to NumPy functions (since they behave like NumPy arrays).
log_review_count = np.log(yelp_df['review_count']) print(log_review_count.head()) print(log_review_count.shape) mean_review_count = yelp_df['review_count'].mean() print(mean_review_count)
29.300648426379883
MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
In the first example we took the _logarithm_ of the review count for each business. In the second case, we calculated the mean review count of all businesses. In the first case, we ended up with a number for each business. We _transformed_ the review counts using the logarithm. In the second case, we _summarized_ the review counts of all the businesses in one number. This summary is a form of _data aggregation_, in which we take many data points and combine them into some smaller representation. The functions we apply to our data sets will either be in the category of **transformations** or **aggregations**.Sometimes we will need to transform our data in order for it to be usable. For instance, in the `'attributes'` column of our DataFrame, we have a `dict` for each business listing all of its properties. If I wanted to find a restaurant that offers delivery service, it would be difficult for me to filter the DataFrame, even though that information is in the `'attributes'` column. First, I need to transform the `dict` into something more useful.
def get_delivery_attr(attr_dict): return attr_dict.get('Delivery')
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
If we give this function a `dict` from the `'attributes'` column, it will look for the `'Delivery'` key. If it finds that key, it returns the value. If it doesn't find the key, it will return none.
print(get_delivery_attr(yelp_df.loc[0, 'attributes'])) print(get_delivery_attr(yelp_df.loc[1, 'attributes'])) print(get_delivery_attr(yelp_df.loc[2, 'attributes']))
None False False
MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We could iterate over the rows of `yelp_df['attributes']` to get all of the values, but there is a better way. DataFrames and Series have an `apply` method that allows us to apply our function to the entire data set at once, like we did earlier with `np.log`.
delivery_attr = yelp_df['attributes'].apply(get_delivery_attr) delivery_attr.head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We can make a new column in our DataFrame with this transformed (and useful) information.
yelp_df['delivery'] = delivery_attr # to find businesses that deliver yelp_df[yelp_df['delivery'].fillna(False)].head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
It's less common (though possible) to use `apply` on an entire DataFrame rather than just one column. Since a DataFrame might contain many types of data, we won't usually want to apply the same transformation or aggregation across all of the columns. Exercise
# filter categories categories_attr = yelp_df['categories'].apply(lambda x: 'Restaurants' in x) categories_attr yelp_df['Restaurants'] = categories_attr portion = yelp_df[yelp_df['Restaurants']]['delivery'].fillna(False).mean() * 100 print("Portion of Restaurants that deliver: %.2f" % portion)
Portion of Restaurants that deliver: 16.25
MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Data aggregation with `groupby`Data aggregation is an [_overloaded_](https://en.wikipedia.org/wiki/Function_overloading) term. It refers to both data summarization (as above) but also to the combining of different data sets.With our Yelp data, we might be interested in comparing the star ratings of businesses in different cities. We could calculate the mean star rating for each city, and this would allow us to easily compare them. First we would have to split up our data by city, calculate the mean for each city, and then combine it back at the end. This procedure is known as [split-apply-combine](https://pandas.pydata.org/pandas-docs/stable/groupby.html) and is a classic example of data aggregation (in the sense of both summarizing data and also combining different data sets).We achieve the splitting and recombining using the `groupby` method.
stars_by_city = yelp_df.groupby('city')['stars'].mean() stars_by_city.head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We can also apply multiple functions at once. It might be helpful to know the standard deviation of star ratings, the total number of reviews, and the count of businesses as well.
agg_by_city = yelp_df.groupby('city').agg({'stars': ['mean', 'std'], 'review_count': 'sum', 'business_id': 'count'}) agg_by_city.head() new_columns = map(lambda x: '_'.join(x), zip(agg_by_city.columns.get_level_values(0), agg_by_city.columns.get_level_values(1))) # unstacking the columns new_columns = map(lambda x: '_'.join(x), zip(agg_by_city.columns.get_level_values(0), agg_by_city.columns.get_level_values(1))) agg_by_city.columns = new_columns agg_by_city.head() lambda x: '_'.join(x), zip(agg_by_city.columns.get_level_values(0), agg_by_city.columns.get_level_values(1))
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
How does this work? What does `groupby` do? Let's start by inspecting the result of `groupby`.
by_city = yelp_df.groupby('city') by_city dir(by_city) print(type(by_city.groups)) list(by_city.groups.items())[:5] by_city.get_group('Anthem').head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
When we use `groupby` on a column, Pandas builds a `dict`, using the unique elements of the column as the keys and the index of the rows in each group as the values. This `dict` is stored in the `groups` attribute. Pandas can then use this `dict` to direct the application of aggregating functions over the different groups. SortingEven though the DataFrame in many ways behaves similarly to a `dict`, it also is ordered. Therefore we can sort the data in it. Pandas provides two sorting methods, `sort_values` and `sort_index`.
yelp_df.sort_values('stars').head() yelp_df.set_index('business_id').sort_index().head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Don't forget that most Pandas operations return a copy of the DataFrame, and do not update the DataFrame in place (unless we tell it to)! Joining data sets Often we will want to augment one data set with data from another. For instance, businesses in big cities probably get more reviews than those in small cities. It could be useful to scale the review counts by the city's population. To do that, we'll need to add population data to the Yelp data. We can get population data from the US census.
census = pd.read_csv('./data/PEP_2016_PEPANNRES.csv', skiprows=[1]) census.head() # construct city & state fields census['city'] = census['GEO.display-label'].apply(lambda x: x.split(', ')[0]) census['state'] = census['GEO.display-label'].apply(lambda x: x.split(', ')[2]) # convert state names to abbreviations print(census['state'].unique()) state_abbr = dict(zip(census['state'].unique(), ['CT', 'IL', 'IN', 'KS', 'ME', 'MA', 'MI', 'MN', 'MO', 'NE', 'NH', 'NJ', 'NY', 'ND', 'OH', 'PA', 'RI', 'SD', 'VT', 'WI'])) state_abbr census['state'] = census['state'].replace(state_abbr) census.head() # remove last word (e.g. 'city', 'town', township', 'borough', 'village') from city names census['city'] = census['city'].apply(lambda x: ' '.join(x.split(' ')[:-1])) city_example = "Bethel Little Town" " ".join(city_example.split(' ')[:-1]) census.head() merged_df = yelp_df.merge(census, on=['state', 'city']) merged_df.head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
The `merge` function looks through the `'state'` and `'city'` columns of `yelp_df` and `census` and tries to match up rows that share values. When a match is found, the rows are combined. What happens when a match is not found? We can imagine four scenarios: 1. We only keep rows from `yelp_df` and `census` if they match. Any rows from either table that have no match are discarded. This is called an _inner join_. 2. We keep all rows from `yelp_df` and `census`, even if they have no match. In this case, when a row in `yelp_df` has no match in `census`, all the columns from `census` are merged in with null values. When a row in `census` has no match in `yelp_df`, all the columns from `yelp_df` are merged in with null values. This is called an _outer join_.3. We privilege the `yelp_df` data. If a row in `yelp_df` has no match in `census`, we keep it and fill in the missing `census` columns as null values. If a row in `census` has no match in `yelp_df`, we discard it. This is called a _left join_.4. We privilege the `census` data. This is called a _right join_.The default behavior for Pandas is case 1, the _inner join_. This means if there are cities in `yelp_df` that we don't have matching `census` data for, they are dropped. Therefore, `merged_df` might be smaller than `yelp_df`.
print(yelp_df.shape) print(merged_df.shape)
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
There are a lot of cities in `yelp_df` that aren't in `census`! We might want to keep these rows, but we don't need any census data where there are no businesses. Then we should use a _left join_.
merged_df = yelp_df.merge(census, on=['state', 'city'], how='left') print(yelp_df.shape) print(merged_df.shape)
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Sometimes we don't need to merge together the columns of separate data sets, but just need to add more rows. For example, the New York City subway system [releases data about how many customers enter and exit the station each week](http://web.mta.info/developers/turnstile.html). Each weekly data set has the same columns, so if we want multiple weeks of data, we just have to append one week to another.
nov18 = pd.read_csv('http://web.mta.info/developers/data/nyct/turnstile/turnstile_171118.txt') nov11 = pd.read_csv('http://web.mta.info/developers/data/nyct/turnstile/turnstile_171111.txt') nov18.head() nov11.head() nov = pd.concat([nov18, nov11]) nov['DATE'].unique()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
We can also use `concat` to perform inner and outer joins based on index. For example, we can perform some data aggregation and then join the results onto the original DataFrame.
city_counts = yelp_df.groupby('city')['business_id'].count().rename('city_counts') city_counts.head() yelp_df.head() pd.concat([yelp_df.set_index('city'), city_counts], axis=1, join='inner').reset_index().head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Pandas provides [extensive documentation](https://pandas.pydata.org/pandas-docs/stable/merging.html) with diagrammed examples on different methods and approaches for joining data. Working with time seriesPandas has a well-designed backend for inferring dates and times from strings and doing meaningful computations with them.
pop_growth = pd.read_html('https://web.archive.org/web/20170127165708/https://www.census.gov/population/international/data/worldpop/table_population.php', attrs={'class': 'query_table'}, parse_dates=[0])[0] pop_growth.dropna(inplace=True) pop_growth.head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
By setting the `'Year'` column to the index, we can easily aggregate data by date using the `resample` method. The `resample` method allows us to decrease or increase the sampling frequency of our data. For instance, maybe instead of yearly data, we want to see average quantities for each decade.
pop_growth.set_index('Year', inplace=True) pop_growth.resample('10AS').mean()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
This kind of resampling is called _downsampling_, because we are decreasing the sampling frequency of the data. We can choose how to aggregate the data from each decade (e.g. `mean`). Options for aggregation include `mean`, `median`, `sum`, `last`, and `first`.We can also _upsample_ data. In this case, we don't have data for each quarter, so we have to tell Pandas has to fill in the missing data.
pop_growth.resample('1Q').bfill().head() pop_growth.resample('1Q').ffill().head()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Pandas' time series capabilities are built on the Pandas `Timestamp` class.
print(pd.Timestamp('January 8, 2017')) print(pd.Timestamp('01/08/17 20:13')) print(pd.Timestamp(1.4839*10**18)) print(pd.Timestamp('Feb. 11 2016 2:30 am') - pd.Timestamp('2015-08-03 5:14 pm')) from pandas.tseries.offsets import BDay, Day, BMonthEnd print(pd.Timestamp('January 9, 2017') - Day(4)) print(pd.Timestamp('January 9, 2017') - BDay(4)) print(pd.Timestamp('January 9, 2017') + BMonthEnd(4))
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
If we're entering time series data into a DataFrame it will often be useful to create a range of dates.
pd.date_range(start='1/8/2017', end='3/2/2017', freq='B')
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
The `Timestamp` class is compatible with Python's `datetime` module.
import datetime pd.Timestamp('May 1, 2017') - datetime.datetime(2017, 1, 8)
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Visualizing data with PandasVisualizing a data set is an important first step in drawing insights. We can easily pass data from Pandas to Matplotlib for visualizations, but Pandas also plugs into Matplotlib directly through methods like `plot` and `hist`.
yelp_df['review_count'].apply(np.log).hist(bins=30) pop_growth['Annual Growth Rate (%)'].plot()
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MIT
sam/notebooks/DS_Pandas.ipynb
DebLeong/HealthCareCapstone
Development of an End-to-End ML Model for Navigating an RC car with a Lidar Run in Google Colab View source on GitHub Environment Setup Import Dependencies
import os import csv import cv2 import matplotlib.pyplot as plt import random import pprint import numpy as np from numpy import expand_dims %tensorflow_version 1.x import tensorflow as tf tf.logging.set_verbosity(tf.logging.ERROR) from keras import backend as K from keras.models import Model, Sequential from keras.models import load_model from keras.layers import Dense, GlobalAveragePooling2D, MaxPooling2D, Lambda, Cropping2D from keras.layers.convolutional import Convolution2D from keras.layers.core import Flatten, Dense, Dropout, SpatialDropout2D from keras.optimizers import Adam from keras.callbacks import ModelCheckpoint, TensorBoard from keras.callbacks import EarlyStopping, ReduceLROnPlateau from keras.preprocessing.image import ImageDataGenerator from keras.preprocessing.image import load_img from keras.preprocessing.image import img_to_array from google.colab.patches import cv2_imshow import sklearn from sklearn.model_selection import train_test_split import pandas as pd print("Tensorflow Version:",tf.__version__) print("Tensorflow Keras Version:",tf.keras.__version__) print("Eager mode: ", tf.executing_eagerly())
Using TensorFlow backend.
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Confirm TensorFlow can see the GPU Simply select "GPU" in the Accelerator drop-down in Notebook Settings (either through the Edit menu or the command palette at cmd/ctrl-shift-P).
device_name = tf.test.gpu_device_name() if device_name != '/device:GPU:0': # Raise SystemError('GPU device not found') print('GPU device not found') else: print('Found GPU at: {}'.format(device_name)) # GPU count and name !nvidia-smi -L
Found GPU at: /device:GPU:0 GPU 0: Tesla P100-PCIE-16GB (UUID: GPU-47aa6e31-82c5-f73d-7d78-373fb85348e8)
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Load the Dataset Download and Extract the Dataset
# Download the dataset !curl -O https://selbystorage.s3-us-west-2.amazonaws.com/research/office_3/office_3.tar.gz data_set = 'office_3' tar_file = data_set + '.tar.gz' # Unzip the .tgz file # -x for extract # -v for verbose # -z for gnuzip # -f for file (should come at last just before file name) # -C to extract the zipped contents to a different directory !tar -xvzf $tar_file
office_3/ office_3/ml_training_2019-12-26-14-59-40_12.yaml office_3/ml_training_2019-12-28-10-32-38_7.yaml office_3/camera.csv office_3/ml_training_2019-12-26-14-54-02_0.yaml office_3/ml_training_2019-12-28-10-31-15_5.yaml office_3/ml_training_2019-12-26-14-54-58_2.yaml office_3/ml_training_2019-12-26-14-59-11_11.yaml office_3/ml_training_2019-12-28-10-30-32_4.yaml office_3/ml_training_2019-12-26-14-55-25_3.yaml office_3/.~lock.interpolated.csv# office_3/ml_training_2019-12-26-14-58-43_10.yaml office_3/ml_training_2019-12-26-14-57-46_8.yaml office_3/ml_training_2019-12-26-14-56-50_6.yaml office_3/ml_training_2019-12-28-10-27-15_0.yaml office_3/interpolated.csv office_3/steering.csv office_3/ml_training_2019-12-26-14-57-18_7.yaml office_3/ml_training_2019-12-28-10-29-24_3.yaml office_3/ml_training_2019-12-26-14-54-30_1.yaml office_3/ml_training_2019-12-28-10-31-56_6.yaml office_3/ml_training_2019-12-28-10-28-42_2.yaml office_3/ml_training_2019-12-28-10-28-00_1.yaml 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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Parse the CSV File
# Define path to csv file csv_path = data_set + '/interpolated.csv' # Load the CSV file into a pandas dataframe df = pd.read_csv(csv_path, sep=",") # Print the dimensions print("Dataset Dimensions:") print(df.shape) # Print the first 5 lines of the dataframe for review print("\nDataset Summary:") df.head(5)
Dataset Dimensions: (6253, 8) Dataset Summary:
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Clean and Pre-process the Dataset Remove Unneccessary Columns
# Remove 'index' and 'frame_id' columns df.drop(['index','frame_id'],axis=1,inplace=True) # Verify new dataframe dimensions print("Dataset Dimensions:") print(df.shape) # Print the first 5 lines of the new dataframe for review print("\nDataset Summary:") df.head(5)
Dataset Dimensions: (6253, 6) Dataset Summary:
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Detect Missing Data
# Detect Missing Values print("Any Missing Values?: {}".format(df.isnull().values.any())) # Total Sum print("\nTotal Number of Missing Values: {}".format(df.isnull().sum().sum())) # Sum Per Column print("\nTotal Number of Missing Values per Column:") print(df.isnull().sum())
Any Missing Values?: False Total Number of Missing Values: 0 Total Number of Missing Values per Column: timestamp 0 width 0 height 0 filename 0 angle 0 speed 0 dtype: int64
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Remove Zero Throttle Values
# Determine if any throttle values are zeroes print("Any 0 throttle values?: {}".format(df['speed'].eq(0).any())) # Determine number of 0 throttle values: print("\nNumber of 0 throttle values: {}".format(df['speed'].eq(0).sum())) # Remove rows with 0 throttle values if df['speed'].eq(0).any(): df = df.query('speed != 0') # Reset the index df.reset_index(inplace=True,drop=True) # Verify new dataframe dimensions print("\nNew Dataset Dimensions:") print(df.shape) df.head(5)
Any 0 throttle values?: True Number of 0 throttle values: 55 New Dataset Dimensions: (6198, 6)
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
View Label Statistics
# Steering Command Statistics print("\nSteering Command Statistics:") print(df['angle'].describe()) print("\nThrottle Command Statistics:") # Throttle Command Statistics print(df['speed'].describe())
Steering Command Statistics: count 6198.000000 mean 0.822324 std 1.008619 min -1.533349 25% 0.471148 50% 1.380756 75% 1.466080 max 1.531508 Name: angle, dtype: float64 Throttle Command Statistics: count 6198.000000 mean 0.129354 std 0.015255 min 0.002261 25% 0.118947 50% 0.131835 75% 0.139840 max 0.150000 Name: speed, dtype: float64
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
View Histogram of Steering Commands
#@title Select the number of histogram bins num_bins = 25 #@param {type:"slider", min:5, max:50, step:1} hist, bins = np.histogram(df['angle'], num_bins) center = (bins[:-1]+ bins[1:]) * 0.5 plt.bar(center, hist, width=0.05) #plt.plot((np.min(df['angle']), np.max(df['angle'])), (samples_per_bin, samples_per_bin)) # Normalize the histogram (150-300 for RBG) #@title Normalize the Histogram { run: "auto" } hist = False #@param {type:"boolean"} remove_list = [] samples_per_bin = 150 if hist: for j in range(num_bins): list_ = [] for i in range(len(df['angle'])): if df.loc[i,'angle'] >= bins[j] and df.loc[i,'angle'] <= bins[j+1]: list_.append(i) random.shuffle(list_) list_ = list_[samples_per_bin:] remove_list.extend(list_) print('removed:', len(remove_list)) df.drop(df.index[remove_list], inplace=True) df.reset_index(inplace=True) df.drop(['index'],axis=1,inplace=True) print('remaining:', len(df)) hist, _ = np.histogram(df['angle'], (num_bins)) plt.bar(center, hist, width=0.05) plt.plot((np.min(df['angle']), np.max(df['angle'])), (samples_per_bin, samples_per_bin))
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
View a Sample Image
# View a Single Image index = random.randint(0,df.shape[0]-1) img_name = data_set + '/' + df.loc[index,'filename'] angle = df.loc[index,'angle'] center_image = cv2.imread(img_name) center_image_mod = cv2.resize(center_image, (320,180)) center_image_mod = cv2.cvtColor(center_image_mod,cv2.COLOR_RGB2BGR) # Crop the image height_min = 100 height_max = 170 width_min = 120 width_max = 200 bottom_crop = center_image_mod.shape[0] - height_max right_crop = center_image_mod.shape[1] - width_max crop_img = center_image_mod[height_min:height_max, width_min:width_max] plt.subplot(2,1,1) plt.imshow(center_image_mod) plt.grid(False) plt.xlabel('angle: {:.2}'.format(angle)) plt.show() plt.subplot(2,1,2) plt.imshow(crop_img) plt.grid(False) plt.xlabel('angle: {:.2}'.format(angle)) plt.show()
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
View Multiple Images
# Number of Images to Display num_images = 4 # Display the images i = 0 for i in range (i,num_images): index = random.randint(0,df.shape[0]-1) image_path = df.loc[index,'filename'] angle = df.loc[index,'angle'] img_name = data_set + '/' + image_path image = cv2.imread(img_name) image = cv2.resize(image, (320,180)) image = cv2.cvtColor(image,cv2.COLOR_RGB2BGR) plt.subplot(num_images/2,num_images/2,i+1) plt.xticks([]) plt.yticks([]) plt.grid(False) plt.imshow(image, cmap=plt.cm.binary) plt.xlabel('angle: {:.3}'.format(angle)) i += 1
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Split the Dataset Define an ImageDataGenerator to Augment Images
# Create image data augmentation generator and choose augmentation types datagen = ImageDataGenerator( #rotation_range=20, zoom_range=0.15, #width_shift_range=0.1, #height_shift_range=0.2, #shear_range=10, brightness_range=[0.5,1.0], #horizontal_flip=True, #vertical_flip=True, #channel_shift_range=100.0, fill_mode="reflect")
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
View Image Augmentation Examples
# load the image index = random.randint(0,df.shape[0]-1) img_name = data_set + '/' + df.loc[index,'filename'] original_image = cv2.imread(img_name) original_image = cv2.cvtColor(original_image,cv2.COLOR_RGB2BGR) original_image = cv2.resize(original_image, (320,180)) label = df.loc[index,'angle'] # convert to numpy array data = img_to_array(original_image) # expand dimension to one sample test = expand_dims(data, 0) # prepare iterator it = datagen.flow(test, batch_size=1) # generate batch of images batch = it.next() # convert to unsigned integers for viewing image_aug = batch[0].astype('uint8') print("Augmenting a Single Image: \n") plt.subplot(2,1,1) plt.imshow(original_image) plt.grid(False) plt.xlabel('angle: {:.2}'.format(label)) plt.show() plt.subplot(2,1,2) plt.imshow(image_aug) plt.grid(False) plt.xlabel('angle: {:.2}'.format(label)) plt.show() print("Multiple Augmentations: \n") # generate samples and plot for i in range(0,num_images): # define subplot plt.subplot(num_images/2,num_images/2,i+1) # generate batch of images batch = it.next() # convert to unsigned integers for viewing image = batch[0].astype('uint8') # plot raw pixel data plt.imshow(image) # show the figure plt.show()
Augmenting a Single Image:
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Define a Data Generator
def generator(samples, batch_size=32, aug=0): num_samples = len(samples) while 1: # Loop forever so the generator never terminates for offset in range(0, num_samples, batch_size): batch_samples = samples[offset:offset + batch_size] #print(batch_samples) images = [] angles = [] for batch_sample in batch_samples: if batch_sample[5] != "filename": name = data_set + '/' + batch_sample[3] center_image = cv2.imread(name) center_image = cv2.cvtColor(center_image,cv2.COLOR_RGB2BGR) center_image = cv2.resize( center_image, (320, 180)) #resize from 720x1280 to 180x320 angle = float(batch_sample[4]) if not aug: images.append(center_image) angles.append(angle) else: data = img_to_array(center_image) sample = expand_dims(data, 0) it = datagen.flow(sample, batch_size=1) batch = it.next() image_aug = batch[0].astype('uint8') if random.random() < .5: image_aug = np.fliplr(image_aug) angle = -1 * angle images.append(image_aug) angles.append(angle) X_train = np.array(images) y_train = np.array(angles) yield sklearn.utils.shuffle(X_train, y_train)
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Split the Dataset
samples = [] samples = df.values.tolist() sklearn.utils.shuffle(samples) train_samples, validation_samples = train_test_split(samples, test_size=0.2) print("Number of traing samples: ", len(train_samples)) print("Number of validation samples: ", len(validation_samples))
('Number of traing samples: ', 4958) ('Number of validation samples: ', 1240)
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Define Training and Validation Data Generators
batch_size_value = 32 img_aug = 1 train_generator = generator(train_samples, batch_size=batch_size_value, aug=img_aug) validation_generator = generator( validation_samples, batch_size=batch_size_value, aug=0)
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Compile and Train the Model Build the Model
# Initialize the model model = Sequential() # trim image to only see section with road # (top_crop, bottom_crop), (left_crop, right_crop) model.add(Cropping2D(cropping=((height_min,bottom_crop), (width_min,right_crop)), input_shape=(180,320,3))) # Preprocess incoming data, centered around zero with small standard deviation model.add(Lambda(lambda x: (x / 255.0) - 0.5)) # Nvidia model model.add(Convolution2D(24, (5, 5), activation="relu", name="conv_1", strides=(2, 2))) model.add(Convolution2D(36, (5, 5), activation="relu", name="conv_2", strides=(2, 2))) model.add(Convolution2D(48, (5, 5), activation="relu", name="conv_3", strides=(2, 2))) model.add(SpatialDropout2D(.5, dim_ordering='default')) model.add(Convolution2D(64, (3, 3), activation="relu", name="conv_4", strides=(1, 1))) model.add(Convolution2D(64, (3, 3), activation="relu", name="conv_5", strides=(1, 1))) model.add(Flatten()) model.add(Dense(1164)) model.add(Dropout(.5)) model.add(Dense(100, activation='relu')) model.add(Dropout(.5)) model.add(Dense(50, activation='relu')) model.add(Dropout(.5)) model.add(Dense(10, activation='relu')) model.add(Dropout(.5)) model.add(Dense(1)) model.compile(loss='mse', optimizer=Adam(lr=0.001), metrics=['mse','mae','mape','cosine']) # Print model sumamry model.summary()
/usr/local/lib/python2.7/dist-packages/ipykernel_launcher.py:14: UserWarning: Update your `SpatialDropout2D` call to the Keras 2 API: `SpatialDropout2D(0.5, data_format=None)`
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Setup Checkpoints
# checkpoint model_path = './model' !if [ -d $model_path ]; then echo 'Directory Exists'; else mkdir $model_path; fi filepath = model_path + "/weights-improvement-{epoch:02d}-{val_loss:.2f}.hdf5" checkpoint = ModelCheckpoint(filepath, monitor='val_loss', verbose=1, save_best_only=True, mode='auto', period=1)
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Setup Early Stopping to Prevent Overfitting
# The patience parameter is the amount of epochs to check for improvement early_stop = EarlyStopping(monitor='val_loss', patience=10)
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Reduce Learning Rate When a Metric has Stopped Improving
reduce_lr = ReduceLROnPlateau(monitor='val_loss', factor=0.2, patience=5, min_lr=0.001)
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Setup Tensorboard
# Clear any logs from previous runs !rm -rf ./Graph/ # Launch Tensorboard !pip install -U tensorboardcolab from tensorboardcolab import * tbc = TensorBoardColab() # Configure the Tensorboard Callback tbCallBack = TensorBoard(log_dir='./Graph', histogram_freq=1, write_graph=True, write_grads=True, write_images=True, batch_size=batch_size_value, update_freq='epoch')
Requirement already up-to-date: tensorboardcolab in /usr/local/lib/python2.7/dist-packages (0.0.22) Wait for 8 seconds... TensorBoard link: http://5deaa30c.ngrok.io
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Load Existing Model
load = True #@param {type:"boolean"} if load: # Returns a compiled model identical to the previous one !curl -O https://selbystorage.s3-us-west-2.amazonaws.com/research/office_3/model_intensity.h5 !mv model_intensity.h5 model/ model_path_full = model_path + '/' + 'model_intensity.h5' model = load_model(model_path_full) print("Loaded previous model: {} \n".format(model_path_full)) else: print("No previous model loaded \n")
% Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 8297k 100 8297k 0 0 10.4M 0 --:--:-- --:--:-- --:--:-- 10.4M Loaded previous model: ./model/model_intensity.h5
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Train the Model
# Define step sizes STEP_SIZE_TRAIN = len(train_samples) / batch_size_value STEP_SIZE_VALID = len(validation_samples) / batch_size_value # Define number of epochs n_epoch = 50 # Define callbacks # callbacks_list = [TensorBoardColabCallback(tbc)] # callbacks_list = [TensorBoardColabCallback(tbc), early_stop] # callbacks_list = [TensorBoardColabCallback(tbc), early_stop, checkpoint] callbacks_list = [TensorBoardColabCallback(tbc), early_stop, checkpoint, reduce_lr] # Fit the model history_object = model.fit_generator( generator=train_generator, steps_per_epoch=STEP_SIZE_TRAIN, validation_data=validation_generator, validation_steps=STEP_SIZE_VALID, callbacks=callbacks_list, use_multiprocessing=True, epochs=n_epoch)
Epoch 1/50 154/154 [==============================] - 87s 563ms/step - loss: 1.6989 - mean_squared_error: 1.6989 - mean_absolute_error: 1.2303 - mean_absolute_percentage_error: 2537433.2419 - cosine_proximity: -0.0099 - val_loss: 1.7245 - val_mean_squared_error: 1.7245 - val_mean_absolute_error: 1.2423 - val_mean_absolute_percentage_error: 359371.0461 - val_cosine_proximity: 0.6513 Epoch 00001: val_loss did not improve from 0.25825 Epoch 2/50 154/154 [==============================] - 84s 544ms/step - loss: 1.6901 - mean_squared_error: 1.6901 - mean_absolute_error: 1.2264 - mean_absolute_percentage_error: 1111287.3951 - cosine_proximity: 0.0278 - val_loss: 1.7239 - val_mean_squared_error: 1.7239 - val_mean_absolute_error: 1.2447 - val_mean_absolute_percentage_error: 135715.2303 - val_cosine_proximity: 0.6531 Epoch 00002: val_loss did not improve from 0.25825 Epoch 3/50 154/154 [==============================] - 84s 547ms/step - loss: 1.6869 - mean_squared_error: 1.6869 - mean_absolute_error: 1.2249 - mean_absolute_percentage_error: 1008224.7047 - cosine_proximity: -0.0091 - val_loss: 1.7412 - val_mean_squared_error: 1.7412 - val_mean_absolute_error: 1.2491 - val_mean_absolute_percentage_error: 829392.7223 - val_cosine_proximity: 0.6490 Epoch 00003: val_loss did not improve from 0.25825 Epoch 4/50 154/154 [==============================] - 84s 547ms/step - loss: 1.6889 - mean_squared_error: 1.6889 - mean_absolute_error: 1.2260 - mean_absolute_percentage_error: 1412263.8743 - cosine_proximity: -0.0113 - val_loss: 1.7407 - val_mean_squared_error: 1.7407 - val_mean_absolute_error: 1.2500 - val_mean_absolute_percentage_error: 764262.0272 - val_cosine_proximity: 0.6540 Epoch 00004: val_loss did not improve from 0.25825 Epoch 5/50 154/154 [==============================] - 84s 546ms/step - loss: 1.6907 - mean_squared_error: 1.6907 - mean_absolute_error: 1.2266 - mean_absolute_percentage_error: 828353.1170 - cosine_proximity: -0.0121 - val_loss: 1.7345 - val_mean_squared_error: 1.7345 - val_mean_absolute_error: 1.2476 - val_mean_absolute_percentage_error: 642487.7258 - val_cosine_proximity: 0.6440 Epoch 00005: val_loss did not improve from 0.25825 Epoch 6/50 154/154 [==============================] - 84s 547ms/step - loss: 1.6900 - mean_squared_error: 1.6900 - mean_absolute_error: 1.2263 - mean_absolute_percentage_error: 477814.4326 - cosine_proximity: -0.0047 - val_loss: 1.7299 - val_mean_squared_error: 1.7299 - val_mean_absolute_error: 1.2463 - val_mean_absolute_percentage_error: 307544.4697 - val_cosine_proximity: 0.6482 Epoch 00006: val_loss did not improve from 0.25825 Epoch 7/50 154/154 [==============================] - 84s 545ms/step - loss: 1.6886 - mean_squared_error: 1.6886 - mean_absolute_error: 1.2257 - mean_absolute_percentage_error: 516291.1301 - cosine_proximity: 0.0073 - val_loss: 1.7157 - val_mean_squared_error: 1.7157 - val_mean_absolute_error: 1.2402 - val_mean_absolute_percentage_error: 33908.3636 - val_cosine_proximity: -0.6482 Epoch 00007: val_loss did not improve from 0.25825 Epoch 8/50 154/154 [==============================] - 84s 547ms/step - loss: 1.6905 - mean_squared_error: 1.6905 - mean_absolute_error: 1.2262 - mean_absolute_percentage_error: 562722.2738 - cosine_proximity: 0.0023 - val_loss: 1.7237 - val_mean_squared_error: 1.7237 - val_mean_absolute_error: 1.2433 - val_mean_absolute_percentage_error: 251274.9909 - val_cosine_proximity: 0.6474 Epoch 00008: val_loss did not improve from 0.25825 Epoch 9/50 8/154 [>.............................] - ETA: 56s - loss: 1.7026 - mean_squared_error: 1.7026 - mean_absolute_error: 1.2320 - mean_absolute_percentage_error: 139298.7649 - cosine_proximity: 0.0745
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Save the Model
# Save model model_path_full = model_path + '/' model.save(model_path_full + 'model.h5') with open(model_path_full + 'model.json', 'w') as output_json: output_json.write(model.to_json())
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Evaluate the Model Plot the Training Results
# Plot the training and validation loss for each epoch print('Generating loss chart...') plt.plot(history_object.history['loss']) plt.plot(history_object.history['val_loss']) plt.title('model mean squared error loss') plt.ylabel('mean squared error loss') plt.xlabel('epoch') plt.legend(['training set', 'validation set'], loc='upper right') plt.savefig(model_path + '/model.png') # Done print('Done.')
Generating loss chart... Done.
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Print Performance Metrics
scores = model.evaluate_generator(validation_generator, STEP_SIZE_VALID, use_multiprocessing=True) metrics_names = model.metrics_names for i in range(len(model.metrics_names)): print("Metric: {} - {}".format(metrics_names[i],scores[i]))
Metric: loss - 0.190782873646 Metric: mean_squared_error - 0.190782873646 Metric: mean_absolute_error - 0.330186681136 Metric: mean_absolute_percentage_error - 28329829.3002 Metric: cosine_proximity - -0.870888157895
BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Compute Prediction Statistics
# Define image loading function def load_images(dataframe): # initialize images array images = [] for i in dataframe.index.values: name = data_set + '/' + dataframe.loc[i,'filename'] center_image = cv2.imread(name) center_image = cv2.resize(center_image, (320,180)) images.append(center_image) return np.array(images) # Load images test_size = 200 df_test = df.sample(frac=1).reset_index(drop=True) df_test = df_test.head(test_size) test_images = load_images(df_test) batch_size = 32 preds = model.predict(test_images, batch_size=batch_size, verbose=1) #print("Preds: {} \n".format(preds)) testY = df_test.iloc[:,4].values #print("Labels: {} \n".format(testY)) df_testY = pd.Series(testY) df_preds = pd.Series(preds.flatten) # Replace 0 angle values if df_testY.eq(0).any(): df_testY.replace(0, 0.0001,inplace=True) # Calculate the difference diff = preds.flatten() - df_testY percentDiff = (diff / testY) * 100 absPercentDiff = np.abs(percentDiff) # compute the mean and standard deviation of the absolute percentage # difference mean = np.mean(absPercentDiff) std = np.std(absPercentDiff) print("[INFO] mean: {:.2f}%, std: {:.2f}%".format(mean, std)) # Compute the mean and standard deviation of the difference print(diff.describe()) # Plot a histogram of the prediction errors num_bins = 25 hist, bins = np.histogram(diff, num_bins) center = (bins[:-1]+ bins[1:]) * 0.5 plt.bar(center, hist, width=0.05) plt.title('Historgram of Predicted Error') plt.xlabel('Steering Angle') plt.ylabel('Number of predictions') plt.xlim(-2.0, 2.0) plt.plot(np.min(diff), np.max(diff)) # Plot a Scatter Plot of the Error plt.scatter(testY, preds) plt.xlabel('True Values ') plt.ylabel('Predictions ') plt.axis('equal') plt.axis('square') plt.xlim([-1.75,1.75]) plt.ylim([-1.75,1.75]) plt.plot([-1.75, 1.75], [-1.75, 1.75], color='k', linestyle='-', linewidth=.1)
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Plot a Prediction
# Plot the image with the actual and predicted steering angle index = random.randint(0,df_test.shape[0]-1) img_name = data_set + '/' + df_test.loc[index,'filename'] center_image = cv2.imread(img_name) center_image = cv2.cvtColor(center_image,cv2.COLOR_RGB2BGR) center_image_mod = cv2.resize(center_image, (320,180)) plt.imshow(center_image_mod) plt.grid(False) plt.xlabel('Actual: {:.2f} Predicted: {:.2f}'.format(df_test.loc[index,'angle'],float(preds[index]))) plt.show()
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Visualize the Network Show the Model Summary
model.summary()
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Access Individual Layers
# Creating a mapping of layer name ot layer details # We will create a dictionary layers_info which maps a layer name to its charcteristics layers_info = {} for i in model.layers: layers_info[i.name] = i.get_config() # Here the layer_weights dictionary will map every layer_name to its corresponding weights layer_weights = {} for i in model.layers: layer_weights[i.name] = i.get_weights() pprint.pprint(layers_info['conv_5'])
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Visualize the Filters
# Visualize the first filter of each convolution layer layers = model.layers layer_ids = [2,3,4,6,7] #plot the filters fig,ax = plt.subplots(nrows=1,ncols=5) for i in range(5): ax[i].imshow(layers[layer_ids[i]].get_weights()[0][:,:,:,0][:,:,0],cmap='gray') ax[i].set_title('Conv'+str(i+1)) ax[i].set_xticks([]) ax[i].set_yticks([])
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Visualize the Saliency Map
!pip install -I scipy==1.2.* !pip install git+https://github.com/raghakot/keras-vis.git -U # import specific functions from keras-vis package from vis.utils import utils from vis.visualization import visualize_saliency, visualize_cam, overlay # View a Single Image index = random.randint(0,df.shape[0]-1) img_name = data_set + '/' + df.loc[index,'filename'] sample_image = cv2.imread(img_name) sample_image = cv2.cvtColor(sample_image,cv2.COLOR_RGB2BGR) sample_image_mod = cv2.resize(sample_image, (320,180)) plt.imshow(sample_image_mod) layer_idx = utils.find_layer_idx(model, 'conv_5') grads = visualize_saliency(model, layer_idx, filter_indices=None, seed_input=sample_image_mod, grad_modifier='absolute', backprop_modifier='guided') plt.imshow(grads, alpha = 0.6)
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BSD-2-Clause
rover_ml/colab/RC_Car_End_to_End_Image_Regression_with_CNNs_(Lidar).ipynb
yassineITler/diy_driverless_car_ROS
Task 0 (YOLOv5 note)์šฉ์–ด, ๊ฐœ๋…, ๊ถ๊ธˆํ•œ ๋ฌธ์ œ๋“ค ๊ธฐ๋ก (link) Task 1 (์‚ฌ์ „์ž‘์—…) YOLOv5 ๋ชจ๋ธ์ž‘์—…์— ๋“ค์–ด๊ฐ€๊ธฐ์ „, ๋ฐ์ดํ„ฐ๋ฅผ ํ™•์ธํ•˜๊ณ  ์ •์ œํ•œ ์ž‘์—… ๋‚ด์šฉ์„ ๋‹ด๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค(here) Putting data into a folder Convert the Annotations into the YOLOv5 Format Testing the annotations Partition the Dataset Task 2 (ํ•™์Šต) YOLOv5 ํ™˜๊ฒฝ์„ค์ •๋ถ€ํ„ฐ ํ•™์Šตํ•œ ์ž‘์—…๋‚ด์šฉ์„ ๋‹ด๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค(link) Set up the environment Data Config File Hyper-parameter Config File Custom Network Architecture Train the Model Task 3 (๊ฒฐ๊ณผ) ํ•™์Šต ํ›„ ํ…Œ์ŠคํŠธ์™€ ์„ฑ๋Šฅํ‰๊ฐ€์˜ ๊ฒฐ๊ณผ๋‚ด์šฉ์„ ๋‹ด๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค(link) Test Computing the mAP on test dataset --- ์ˆ˜์ •๋œ ์ž‘์—…(up-to-date) **1. Putting data into a folder**๋‚˜๋ˆ ์ง„ ๋ฐ์ดํ„ฐ๋ฅผ ์ž‘์—…ํ•  ํด๋”์— images์™€ labelsํด๋” ์•„๋ž˜๋กœ ๋ชจ์Œ**Original Data**- [์›์ฒœ]๋„์‹ฌ๋กœ_์ฃผ๊ฐ„์ผ์ถœ_๋ง‘์Œ_45_์ „๋ฐฉ, [๋ผ๋ฒจ]๋„์‹ฌ๋กœ_์ฃผ๊ฐ„์ผ์ถœ_๋ง‘์Œ_45_์ „๋ฐฉ- [์›์ฒœ]๋„์‹ฌ๋กœ_์ฃผ๊ฐ„์ผ์ถœ_๋ง‘์Œ_60_์ „๋ฐฉ, [๋ผ๋ฒจ]๋„์‹ฌ๋กœ_์ฃผ๊ฐ„์ผ์ถœ_๋ง‘์Œ_60_์ „๋ฐฉ- [์›์ฒœ]๋„์‹ฌ๋กœ_์ฃผ๊ฐ„์ผ์ถœ_๋ง‘์Œ_120_์ „๋ฐฉ, [๋ผ๋ฒจ]๋„์‹ฌ๋กœ_์ฃผ๊ฐ„์ผ์ถœ_๋ง‘์Œ_120_์ „๋ฐฉ์ด 2318๊ฐœ์˜ ์ด๋ฏธ์ง€์™€ ๋ผ๋ฒจ๋ง๋œ xml**Datafile Directory**- dataset - images - train - val - labels - train - val **2. Convert the Annotations into the YOLOv5 Format**์ฃผ์˜: datasetํด๋”๊ฐ€ ์žˆ๋Š” ์ƒ์œ„ํด๋” ๊ฒฝ๋กœ์—์„œ ์ง„ํ–‰ํ•ด์•ผํ•จ``` pythonex%cd /content/gdrive/MyDrive/แ„€แ…ขแ†จแ„Žแ…ฆแ„แ…กแ†ทแ„Œแ…ต!ls dataset```
############ ๊ฒฝ๋กœ์„ค์ • ############ from google.colab import drive drive.mount('/content/gdrive') %cd /content/gdrive/MyDrive/แ„€แ…ขแ†จแ„Žแ…ฆแ„แ…กแ†ทแ„Œแ…ต !ls ############ xml ํŒŒ์ผ ํ™•์ธ ############ #!cat dataset/labels/Bright_20130218_153731_000210_v001_1.xml ############ XMLํŒŒ์ผ์—์„œ ์ •๋ณด ๊ธ์–ด์˜ค๋Š” ํ•จ์ˆ˜ ############ def extract_info_from_xml(xml_file): root = ET.parse(xml_file).getroot() info_dict = {} info_dict['bboxes'] = [] for elem in root: if elem.tag == "filename": info_dict['filename'] = elem.text elif elem.tag == "size": image_size = [] for subelem in elem: image_size.append(int(subelem.text)) info_dict['image_size'] = tuple(image_size) elif elem.tag == "object": bbox = {} for subelem in elem: if subelem.tag == "name": bbox["class"] = subelem.text elif subelem.tag == "bndbox": for subsubelem in subelem: bbox[subsubelem.tag] = int(subsubelem.text) info_dict['bboxes'].append(bbox) return info_dict ############ ๊ธ์–ด์˜จ xml ์ •๋ณด ํ™•์ธ ############ print(extract_info_from_xml('dataset/labels/Bright_20130218_153731_000210_v001_1.xml')) ############ ํด๋ž˜์Šค๋ช…๊ณผ ํด๋ž˜์ŠคID dictionary ๋งŒ๋“ฌ ############ class_name_to_id_mapping = {"Vehicle_Car": 0, "Vehicle_Bus": 1, "Vehicle_Motorcycle": 2, "Vehicle_Unknown": 3} ############ yolov5 ํ˜•์‹์œผ๋กœ ๋ณ€ํ™˜ํ•˜๋Š” ํ•จ์ˆ˜ ############ def convert_to_yolov5(info_dict): global class_id print_buffer = [] for b in info_dict["bboxes"]: try: class_id = class_name_to_id_mapping[b["class"]] except KeyError: print("Invalid Class. Must be one from ", class_name_to_id_mapping.keys()) b_center_x = (b["xmin"] + b["xmax"]) / 2 b_center_y = (b["ymin"] + b["ymax"]) / 2 b_width = (b["xmax"] - b["xmin"]) b_height = (b["ymax"] - b["ymin"]) image_w, image_h, image_c = info_dict["image_size"] b_center_x /= image_w b_center_y /= image_h b_width /= image_w b_height /= image_h print_buffer.append("{} {:.3f} {:.3f} {:.3f} {:.3f}".format(class_id, b_center_x, b_center_y, b_width, b_height)) save_file_name = os.path.join("dataset/labels", info_dict["filename"].replace("jpg", "txt")) print("\n".join(print_buffer), file= open(save_file_name, "w")) ############ ํ•จ์ˆ˜์‹คํ–‰(ํฌ๋งท)์„ ์œ„ํ•ด xml ํŒŒ์ผ์ด๋ฆ„ ๊ฐ€์ ธ์˜ค๊ธฐ ############ annotations = [os.path.join('dataset/labels', x) for x in os.listdir('dataset/labels') if x[-3:] == "xml"] annotations.sort() ############ ๋ณ€ํ™˜ ํ›„ ์ €์žฅ(์‹œ๊ฐ„ ์กฐ๊ธˆ ์†Œ์š”) ############ for ann in tqdm(annotations): info_dict = extract_info_from_xml(ann) convert_to_yolov5(info_dict) annotations = [os.path.join('dataset/labels', x) for x in os.listdir('dataset/labels') if x[-3:] == "txt"]
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MIT
yolov5/YOLOv5_Task1.ipynb
sosodoit/yolov5
**3. Testing the annotations**xml์ด ์ž˜ ๋ณ€ํ™˜๋˜์–ด์„œ bb ์ž˜ ์žก๋Š”์ง€ ํ…Œ์ŠคํŠธ
%cd /content/gdrive/MyDrive/แ„€แ…ขแ†จแ„Žแ…ฆแ„แ…กแ†ทแ„Œแ…ต random.seed(0) class_id_to_name_mapping = dict(zip(class_name_to_id_mapping.values(), class_name_to_id_mapping.keys())) def plot_bounding_box(image, annotation_list): annotations = np.array(annotation_list) w, h = image.size plotted_image = ImageDraw.Draw(image) transformed_annotations = np.copy(annotations) transformed_annotations[:,[1,3]] = annotations[:,[1,3]] * w transformed_annotations[:,[2,4]] = annotations[:,[2,4]] * h transformed_annotations[:,1] = transformed_annotations[:,1] - (transformed_annotations[:,3] / 2) transformed_annotations[:,2] = transformed_annotations[:,2] - (transformed_annotations[:,4] / 2) transformed_annotations[:,3] = transformed_annotations[:,1] + transformed_annotations[:,3] transformed_annotations[:,4] = transformed_annotations[:,2] + transformed_annotations[:,4] for ann in transformed_annotations: obj_cls, x0, y0, x1, y1 = ann plotted_image.rectangle(((x0,y0), (x1,y1))) plotted_image.text((x0, y0 - 10), class_id_to_name_mapping[(int(obj_cls))]) plt.imshow(np.array(image)) plt.show() # Get any random annotation file annotation_file = random.choice(annotations) with open(annotation_file, "r") as file: annotation_list = file.read().split("\n")[:-1] annotation_list = [x.split(" ") for x in annotation_list] annotation_list = [[float(y) for y in x ] for x in annotation_list] #Get the corresponding image file image_file = annotation_file.replace("labels", "images").replace("txt", "jpg") assert os.path.exists(image_file) #Load the image image = Image.open(image_file) #Plot the Bounding Box plot_bounding_box(image, annotation_list)
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MIT
yolov5/YOLOv5_Task1.ipynb
sosodoit/yolov5
**4. Partition the Dataset**YOLOv5 ํ•™์Šต ์ง„ํ–‰ ํ•˜๊ธฐ์ „, train-valid dataset์„ ๋‚˜๋ˆ„๋Š” ์ž‘์—…์„ ์ง„ํ–‰
########## ์‚ฌ์ง„๊ณผ ๋ผ๋ฒจ๋ง ํŒŒ์ผ๋ช… ์ฝ์–ด์˜ค๊ธฐ ########## images = [os.path.join('dataset/images', x) for x in os.listdir('dataset/images')] annotations = [os.path.join('dataset/labels', x) for x in os.listdir('dataset/labels') if x[-3:] == "txt"] images.sort() annotations.sort() ########## train-valid 8:2 ๋น„์œจ๋กœ ๋ฐ์ดํ„ฐ์…‹ ๋‚˜๋ˆ„๊ธฐ ########## train_images, val_images, train_annotations, val_annotations = train_test_split(images, annotations, test_size = 0.2, random_state = 2000) ########## ๋‚˜๋ˆ ์ง„ ๋ฐ์ดํ„ฐ๋ฅผ ๊ฐ๊ฐ train, val ํด๋”์— ์˜ฎ๊ฒจ์คŒ ########## !mkdir dataset/images/train dataset/images/val dataset/labels/train dataset/labels/val def move_files_to_folder(list_of_files, destination_folder): for f in list_of_files: try: shutil.move(f, destination_folder) except: print(f) assert False move_files_to_folder(train_images, 'dataset/images/train') move_files_to_folder(val_images, 'dataset/images/val/') move_files_to_folder(train_annotations, 'dataset/labels/train/') move_files_to_folder(val_annotations, 'dataset/labels/val/')
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MIT
yolov5/YOLOv5_Task1.ipynb
sosodoit/yolov5