app.py

from datasets import load_dataset
from datasets import Dataset
from sentence_transformers import SentenceTransformer
import faiss
import time
#import torch
import pandas as pd
from llama_cpp import Llama
from langchain_community.llms import LlamaCpp

from transformers import AutoTokenizer, GenerationConfig #, AutoModelForCausalLM
#from transformers import AutoModelForCausalLM, AutoModel
from transformers import TextIteratorStreamer
from threading import Thread
from ctransformers import AutoModelForCausalLM, AutoConfig, Config #, AutoTokenizer

from huggingface_hub import Repository, upload_file
import os


HF_TOKEN = os.getenv('HF_Token')
#Log_Path="./Logfolder"
logfile = 'DiabetesChatLog.txt'
historylog = [{
        "Prompt": '',
        "Output": ''
}]

data = load_dataset("Namitg02/Test", split='train', streaming=False)
#Returns a list of dictionaries, each representing a row in the dataset.
length = len(data)

embedding_model = SentenceTransformer("all-MiniLM-L6-v2")
embedding_dim = embedding_model.get_sentence_embedding_dimension()
# Returns dimensions of embedidng


index =  faiss.IndexFlatL2(embedding_dim)
data.add_faiss_index("embeddings", custom_index=index) 
# adds an index column for the embeddings

print("check1")
#question = "How can I reverse Diabetes?"

SYS_PROMPT = """You are an assistant for answering questions.
You are given the extracted parts of documents and a question. Provide a conversational answer.
If you don't know the answer, just say "I do not know." Don't make up an answer."""
# Provides context of how to answer the question

llm_model = "TheBloke/TinyLlama-1.1B-Chat-v1.0-GGUF"
# TheBloke/Llama-2-7B-Chat-GGML , TinyLlama/TinyLlama-1.1B-Chat-v1.0 , microsoft/Phi-3-mini-4k-instruct, health360/Healix-1.1B-V1-Chat-dDPO
# TheBloke/TinyLlama-1.1B-Chat-v1.0-GGUF and tinyllama-1.1b-chat-v1.0.Q4_K_M.gguf not working, TinyLlama/TinyLlama-1.1B-Chat-v0.6, andrijdavid/TinyLlama-1.1B-Chat-v1.0-GGUF"

tokenizer = AutoTokenizer.from_pretrained("TinyLlama/TinyLlama-1.1B-Chat-v1.0")
#initiate model and tokenizer

generation_config = AutoConfig.from_pretrained(
    "TheBloke/TinyLlama-1.1B-Chat-v1.0-GGUF",
    max_new_tokens= 300,
  #  do_sample=True,
  #  stream = streamer,
    top_p=0.95,
    temperature=0.4,
    stream = True
  #  eos_token_id=terminators
)
# send additional parameters to model for generation

#model = llama_cpp.Llama(model_path = tinyllama-1.1b-chat-v1.0.Q4_K_M.gguf AutoModelForCausalLM.from_pretrained(llm_model, model_file = "tinyllama-1.1b-chat-v1.0.Q4_K_M.gguf", model_type="llama", gpu_layers=0, config = generation_config)
model = Llama(
    model_path="./tinyllama-1.1b-chat-v1.0.Q4_K_M.gguf",
    chat_format="llama-2",
    n_gpu_layers = 0,
    temperature=0.75,
    max_tokens=500,
    top_p=0.95,
    # callback_manager=callback_manager,
    # verbose=True,  # Verbose is required to pass to the callback manager
    )
                        
def search(query: str, k: int = 2 ):
    """a function that embeds a new query and returns the most probable results"""
    embedded_query = embedding_model.encode(query) # create embedding of a new query
    scores, retrieved_examples = data.get_nearest_examples( # retrieve results
        "embeddings", embedded_query, # compare our new embedded query with the dataset embeddings
        k=k # get only top k results
    )
    return scores, retrieved_examples
# returns scores (List[float]): the retrieval scores from either FAISS (IndexFlatL2 by default) and examples (dict) format
# called by talk function that passes prompt

#print(scores, retrieved_examples)

def format_prompt(prompt,retrieved_documents,k):
    """using the retrieved documents we will prompt the model to generate our responses"""   
    PROMPT = f"Question:{prompt}\nContext:"
    for idx in range(k) :
        PROMPT+= f"{retrieved_documents['0'][idx]}\n"
    return PROMPT

#def add_history(formatted_prompt, history, memory_limit=3):
    # always keep len(history) <= memory_limit
 #   if len(history) > memory_limit:
  #      history = history[-memory_limit:]

   # if len(history) == 0:
    #    return PROMPT + f"{formatted_prompt} [/INST]"

    #formatted_message = PROMPT + f"{history[0][0]} [/INST] {history[0][1]} </s>"

    # Handle conversation history
#    for user_msg, model_answer in history[1:]:
 #       formatted_message += f"<s>[INST] {user_msg} [/INST] {model_answer} </s>"

  #  # Handle the current message
   # formatted_message += f"<s>[INST] {formatted_prompt} [/INST]"

    #return formatted_message

# Called by talk function to add retrieved documents to the prompt. Keeps adding text of retrieved documents to string taht are retreived

def talk(prompt, history):
    k = 2 # number of retrieved documents
    scores , retrieved_documents = search(prompt, k) # get retrival scores and examples in dictionary format based on the prompt passed
    print(retrieved_documents.keys())
    print("check4")
    formatted_prompt = format_prompt(prompt,retrieved_documents,k) # create a new prompt using the retrieved documents
    print("check5")
    print(retrieved_documents['0'])
    print(formatted_prompt)
  #  formatted_prompt_with_history = add_history(formatted_prompt, history)

   # formatted_prompt_with_history = formatted_prompt_with_history[:600] # to avoid memory issue
    print(formatted_prompt_with_history)
    messages = [{"role":"system","content":SYS_PROMPT},{"role":"user","content":formatted_prompt}]  
    # binding the system context and new prompt for LLM
    # the chat template structure should be based on text generation model format
    print("check6")    
    print(messages)
    print("check7")
    streamer = TextIteratorStreamer(
    tokenizer, timeout=10.0, skip_prompt=True, skip_special_tokens=True
    )
    # stores print-ready text in a queue, to be used by a downstream application as an iterator. removes special tokens in generated text. 
    # timeout for text queue. tokenizer for decoding tokens
    # called by generate_kwargs

    terminators = [
      tokenizer.eos_token_id, # End-of-Sequence Token that indicates where the model should consider the text sequence to be complete
      tokenizer.convert_tokens_to_ids("<|eot_id|>") # Converts a token strings in a single/ sequence of integer id using the vocabulary
    ]
# indicates the end of a sequence
    text = ""
    stream = model(messages, max_tokens=1000, stop=["</s>"], stream=True)
    for output in stream:
        text += output["choices"][0]["text"]
        yield text

#    model_input = model.create_chat_completion(messages = messages)
    
 #   input_ids = tokenizer.apply_chat_template(
 #     messages,
 #     add_generation_prompt=True,
 #     return_tensors="pt"  
 #    )
    # preparing tokens for model input
    # add_generation_prompt argument tells the template to add tokens that indicate the start of a bot response
#    print(input_ids)
#    print("check7")  
#    print(input_ids.dtype)

#    generate_kwargs = dict(
#        tokens= input_ids) #,
#        streamer=streamer,
#        do_sample=True,
#        eos_token_id=terminators,
#    )
    
  #  outputs = model.generate( 
  #  )
  #  print(outputs)
    # calling the model to generate response based on message/ input
    # do_sample if set to True uses strategies to select the next token from the probability distribution over the entire vocabulary
    # temperature controls randomness. more renadomness with higher temperature
    # only the tokens comprising the top_p probability mass are considered for responses
    # This output is a data structure containing all the information returned by generate(), but that can also be used as tuple or dictionary.
 #  
    
 #   print("check10")
 #   t = Thread(target=model.generate, kwargs=generate_kwargs)
    # to process multiple instances
 #   t.start()
  #  print("check11")
    # start a thread
#    outputs = []  
#    outputs = model_input
#    return outputs
#    print(model.tokenize(messages))
#    tokens = model.tokenize(messages)
#    for token in model.generate(tokens):
#       print(model.detokenize([token]))
 #   input_ids = tokenizer(*messages)
#    print(model.generate(tensor([[    1,   529, 29989,  5205, 29989]])))
#    start = time.time()
#    NUM_TOKENS=0
#    print('-'*4+'Start Generation'+'-'*4)
#    for token in model.generate(input_ids):
#    	print(model.detokenize(input_ids), end='', flush=True)
#    	NUM_TOKENS+=1
#    time_generate = time.time() - start
#    print('\n')
#    print('-'*4+'End Generation'+'-'*4)
#    print(f'Num of generated tokens: {NUM_TOKENS}')
 #   print(f'Time for complete generation: {time_generate}s')
 #   print(f'Tokens per secound: {NUM_TOKENS/time_generate}')
 #   print(f'Time per token: {(time_generate/NUM_TOKENS)*1000}ms')


 
    pd.options.display.max_colwidth = 800
    print("check13")
#    outputstring = ''.join(outputs)

#    global historylog
#    historynew = {
#       "Prompt": prompt,
#       "Output": outputstring
#    }
#    historylog.append(historynew)
#    return historylog
#    print(historylog)
    
    
TITLE = "AI Copilot for Diabetes Patients"

DESCRIPTION = "I provide answers to concerns related to Diabetes"

import gradio as gr
# Design chatbot
demo = gr.ChatInterface(
    fn=talk,
    chatbot=gr.Chatbot(
        show_label=True,
        show_share_button=True,
        show_copy_button=True,
        likeable=True,
        layout="bubble",
        bubble_full_width=False,
    ),
    theme="Soft",
    examples=[["what is Diabetes? "]],
    title=TITLE,
    description=DESCRIPTION,
)
# launch chatbot and calls the talk function which in turn calls other functions
print("check14")
#print(historylog)
#memory_panda = pd.DataFrame(historylog)
#Logfile = Dataset.from_pandas(memory_panda)
#Logfile.push_to_hub("Namitg02/Logfile",token = HF_TOKEN)
demo.launch()