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pages/14_MNIST.py
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import streamlit as st
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import torch
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import torch.nn as nn
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import torch.optim as optim
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import torchvision
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import torchvision.transforms as transforms
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import matplotlib.pyplot as plt
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# Define the neural network
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class Net(nn.Module):
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def __init__(self):
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super(Net, self).__init__()
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self.fc1 = nn.Linear(28 * 28, 128)
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self.fc2 = nn.Linear(128, 64)
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self.fc3 = nn.Linear(64, 10)
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def forward(self, x):
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x = x.view(-1, 28 * 28)
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x = torch.relu(self.fc1(x))
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x = torch.relu(self.fc2(x))
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x = self.fc3(x)
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return x
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# Function to train the model
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def train_model(num_epochs):
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# Define transformations
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transform = transforms.Compose([
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transforms.ToTensor(),
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transforms.Normalize((0.5,), (0.5,))
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])
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# Load datasets
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trainset = torchvision.datasets.MNIST(root='./data', train=True, download=True, transform=transform)
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trainloader = torch.utils.data.DataLoader(trainset, batch_size=64, shuffle=True)
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testset = torchvision.datasets.MNIST(root='./data', train=False, download=True, transform=transform)
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testloader = torch.utils.data.DataLoader(testset, batch_size=64, shuffle=False)
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# Initialize the network, loss function, and optimizer
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net = Net()
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criterion = nn.CrossEntropyLoss()
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optimizer = optim.SGD(net.parameters(), lr=0.01, momentum=0.9)
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# Track loss over epochs
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loss_values = []
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# Training loop
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for epoch in range(num_epochs):
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running_loss = 0.0
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for i, data in enumerate(trainloader, 0):
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inputs, labels = data
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optimizer.zero_grad()
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outputs = net(inputs)
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loss = criterion(outputs, labels)
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loss.backward()
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optimizer.step()
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running_loss += loss.item()
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# Append average loss for this epoch
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loss_values.append(running_loss / len(trainloader))
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st.write(f'Epoch {epoch + 1}, Loss: {running_loss / len(trainloader):.3f}')
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st.write('Finished Training')
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# Plot the loss values
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plt.figure(figsize=(10, 5))
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plt.plot(range(1, num_epochs + 1), loss_values, marker='o')
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plt.title('Training Loss over Epochs')
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plt.xlabel('Epoch')
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plt.ylabel('Loss')
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st.pyplot(plt)
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# Evaluate the network on the test data
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correct = 0
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total = 0
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with torch.no_grad():
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for data in testloader:
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images, labels = data
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outputs = net(images)
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_, predicted = torch.max(outputs.data, 1)
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total += labels.size(0)
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correct += (predicted == labels).sum().item()
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st.write(f'Accuracy of the network on the 10000 test images: {100 * correct / total}%')
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# Streamlit interface
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st.title('MNIST Digit Classification with PyTorch')
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num_epochs = st.number_input('Enter number of epochs:', min_value=1, max_value=100, value=10)
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if st.button('Run'):
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train_model(num_epochs)
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