app.py

# app.py  
import spaces
from torch.nn import DataParallel  
from torch import Tensor  
from transformers import AutoTokenizer, AutoModel  
from huggingface_hub import InferenceClient  
from openai import OpenAI  
from langchain_community.document_loaders import UnstructuredFileLoader
from langchain_chroma import Chroma
from chromadb import Documents, EmbeddingFunction, Embeddings  
from chromadb.config import Settings  
import chromadb #import HttpClient 
import os  
import re
import uuid  
import gradio as gr  
import torch  
import torch.nn.functional as F  
from dotenv import load_dotenv
from utils import load_env_variables, parse_and_route , escape_special_characters 
from globalvars import API_BASE, intention_prompt, tasks, system_message, model_name , metadata_prompt 
# import time  
# import httpx  
  


load_dotenv()

os.environ['PYTORCH_CUDA_ALLOC_CONF'] = 'max_split_size_mb:30'  
os.environ['CUDA_LAUNCH_BLOCKING'] = '1'  
os.environ['CUDA_CACHE_DISABLE'] = '1'  
  
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")  
  
### Utils  
hf_token, yi_token = load_env_variables()  
  
def clear_cuda_cache():  
    torch.cuda.empty_cache()  
  
client = OpenAI(api_key=yi_token, base_url=API_BASE)

chroma_client = chromadb.Client(Settings())  
  
# Create a collection  
chroma_collection = chroma_client.create_collection("all-my-documents")  

class EmbeddingGenerator:  
    def __init__(self, model_name: str, token: str, intention_client):  
        self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")  
        self.tokenizer = AutoTokenizer.from_pretrained(model_name, token=token, trust_remote_code=True)  
        self.model = AutoModel.from_pretrained(model_name, token=token, trust_remote_code=True).to(self.device)  
        self.intention_client = intention_client  
  
    def clear_cuda_cache(self):  
        torch.cuda.empty_cache()  

    @spaces.GPU  
    def compute_embeddings(self, input_text: str):  
        escaped_input_text = escape_special_characters(input_text)  
        intention_completion = self.intention_client.chat.completions.create(  
            model="yi-large",  
            messages=[  
                {"role": "system", "content": escape_special_characters(intention_prompt)},  
                {"role": "user", "content": escaped_input_text}  
            ]  
        )  
        intention_output = intention_completion.choices[0].message.content  
        # Parse and route the intention  
        parsed_task = parse_and_route(intention_output)  
        selected_task = parsed_task  
        # Construct the prompt  
        if selected_task in tasks:
            task_description = tasks[selected_task]  
        else:
            task_description = tasks["DEFAULT"]
            print(f"Selected task not found: {selected_task}")  
  
        query_prefix = f"Instruct: {task_description}\nQuery: "  
        queries = [escaped_input_text]  
  
        # Get the metadata  
        metadata_completion = self.intention_client.chat.completions.create(  
            model="yi-large",  
            messages=[  
                {"role": "system", "content": escape_special_characters(metadata_prompt)},  
                {"role": "user", "content": escaped_input_text}  
            ]  
        )  
        metadata_output = metadata_completion.choices[0].message.content
        metadata = self.extract_metadata(metadata_output)  
  
        # Get the embeddings  
        with torch.no_grad():  
            inputs = self.tokenizer(queries, return_tensors='pt', padding=True, truncation=True, max_length=4096).to(self.device)  
            outputs = self.model(**inputs)
            query_embeddings = outputs["sentence_embeddings"].mean(dim=1)    
            query_embeddings = outputs.last_hidden_state.mean(dim=1)  
  
            # Normalize embeddings  
            query_embeddings = F.normalize(query_embeddings, p=2, dim=1)  
            embeddings_list = query_embeddings.detach().cpu().numpy().tolist()  
  
            self.clear_cuda_cache()  
            return embeddings_list, metadata   
  
    def extract_metadata(self, metadata_output: str):  
        # Regex pattern to extract key-value pairs  
        pattern = re.compile(r'\"(\w+)\": \"([^\"]+)\"')  
        matches = pattern.findall(metadata_output)  
        metadata = {key: value for key, value in matches}  
        return metadata 
 
  
class MyEmbeddingFunction(EmbeddingFunction):  
    def __init__(self, model_name: str, token: str, intention_client):  
        self.embedding_generator = EmbeddingGenerator(model_name, token, intention_client)  
  
    def __call__(self, input: Documents) -> (Embeddings, list):  
        embeddings_with_metadata = [self.embedding_generator.compute_embeddings(doc.page_content) for doc in input]  
        embeddings = [item[0] for item in embeddings_with_metadata]  
        metadata = [item[1] for item in embeddings_with_metadata]  
        embeddings_flattened = [emb for sublist in embeddings for emb in sublist]  
        metadata_flattened = [meta for sublist in metadata for meta in sublist]  
        return embeddings_flattened, metadata_flattened   
  
def load_documents(file_path: str, mode: str = "elements"):  
    loader = UnstructuredFileLoader(file_path, mode=mode)  
    docs = loader.load()  
    return [doc.page_content for doc in docs]  

def initialize_chroma(collection_name: str, embedding_function: MyEmbeddingFunction):  
    db = Chroma(client=chroma_client, collection_name=collection_name, embedding_function=embedding_function)  
    return db  
  
def add_documents_to_chroma(documents: list, embedding_function: MyEmbeddingFunction):  
    for doc in documents:  
        embeddings, metadata = embedding_function.embedding_generator.compute_embeddings(doc)  
        for embedding, meta in zip(embeddings, metadata):  
            chroma_collection.add(  
                ids=[str(uuid.uuid1())],  
                documents=[doc],  
                embeddings=[embedding],  
                metadatas=[meta]  
            )  
  
def query_chroma(query_text: str, embedding_function: MyEmbeddingFunction):  
    query_embeddings, query_metadata = embedding_function.embedding_generator.compute_embeddings(query_text)  
    result_docs = chroma_collection.query(  
        query_texts=[query_text],  
        n_results=2  
    )  
    return result_docs  

# Initialize clients  
intention_client = OpenAI(api_key=yi_token, base_url=API_BASE)  
embedding_generator = EmbeddingGenerator(model_name=model_name, token=hf_token, intention_client=intention_client)  
embedding_function = MyEmbeddingFunction(embedding_generator=embedding_generator)  
chroma_db = initialize_chroma(collection_name="Tonic-instruct", embedding_function=embedding_function)

def respond(  
    message,  
    history: list[tuple[str, str]],  
    system_message,  
    max_tokens,  
    temperature,  
    top_p,  
):  
    retrieved_text = query_documents(message)  
    messages = [{"role": "system", "content": escape_special_characters(system_message)}]  
    for val in history:  
        if val[0]:  
            messages.append({"role": "user", "content": val[0]})  
        if val[1]:  
            messages.append({"role": "assistant", "content": val[1]})  
    messages.append({"role": "user", "content": f"{retrieved_text}\n\n{escape_special_characters(message)}"})  
    response = ""  
    for message in intention_client.chat_completion(  
        messages,  
        max_tokens=max_tokens,  
        stream=True,  
        temperature=temperature,  
        top_p=top_p,  
    ):  
        token = message.choices[0].delta.content  
        response += token  
        yield response  
  
def upload_documents(files):  
    for file in files:  
        loader = UnstructuredFileLoader(file.name)  
        documents = loader.load()  
        add_documents_to_chroma(documents, embedding_function)  
    return "Documents uploaded and processed successfully!"  
  
def query_documents(query):  
    results = query_chroma(query)  
    return "\n\n".join([result.content for result in results])  
  
with gr.Blocks() as demo:  
    with gr.Tab("Upload Documents"):  
        document_upload = gr.File(file_count="multiple", file_types=["document"])  
        upload_button = gr.Button("Upload and Process")  
        upload_button.click(upload_documents, inputs=document_upload, outputs=gr.Text())  
  
    with gr.Tab("Ask Questions"):  
        with gr.Row():  
            chat_interface = gr.ChatInterface(  
                respond,  
                additional_inputs=[  
                    gr.Textbox(value="You are a friendly Chatbot.", label="System message"),  
                    gr.Slider(minimum=1, maximum=2048, value=512, step=1, label="Max new tokens"),  
                    gr.Slider(minimum=0.1, maximum=4.0, value=0.7, step=0.1, label="Temperature"),  
                    gr.Slider(minimum=0.1, maximum=1.0, value=0.95, step=0.05, label="Top-p (nucleus sampling)"),  
                ],  
            )  
            query_input = gr.Textbox(label="Query")  
            query_button = gr.Button("Query")  
            query_output = gr.Textbox()  
            query_button.click(query_documents, inputs=query_input, outputs=query_output)  
  
if __name__ == "__main__":  
    # os.system("chroma run --host localhost --port 8000 &")
    demo.launch()