app.py

import gradio as gr
import os
import logging
from langchain_core.prompts import ChatPromptTemplate
from langchain_core.output_parsers import StrOutputParser
from langchain_openai import ChatOpenAI
from langchain_community.graphs import Neo4jGraph
from typing import List
from pydantic import BaseModel, Field
from transformers import pipeline, AutoModelForSpeechSeq2Seq, AutoProcessor
import requests
import tempfile
import torch
import numpy as np

# Setup logging to a file to capture debug information
logging.basicConfig(filename='neo4j_retrieval.log', level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')

# Setup Neo4j connection
graph = Neo4jGraph(
    url="neo4j+s://c62d0d35.databases.neo4j.io",
    username="neo4j",
    password="_x8f-_aAQvs2NB0x6s0ZHSh3W_y-HrENDbgStvsUCM0"
)

# Define entity extraction and retrieval functions
class Entities(BaseModel):
    names: List[str] = Field(
        ..., description="All the person, organization, or business entities that appear in the text"
    )

# Define prompt and model for entity extraction
chat_model = ChatOpenAI(temperature=0, model_name="gpt-4", api_key=os.environ['OPENAI_API_KEY'])
entity_prompt = ChatPromptTemplate.from_messages([
    ("system", "You are extracting organization and person entities from the text."),
    ("human", "Use the given format to extract information from the following input: {question}"),
])
entity_chain = entity_prompt | chat_model.with_structured_output(Entities)

def remove_lucene_chars(input: str) -> str:
    return input.translate(str.maketrans({
        "\\": r"\\", "+": r"\+", "-": r"\-", "&": r"\&", "|": r"\|", "!": r"\!",
        "(": r"\(", ")": r"\)", "{": r"\{", "}": r"\}", "[": r"\[", "]": r"\]",
        "^": r"\^", "~": r"\~", "*": r"\*", "?": r"\?", ":": r"\:", '"': r'\"',
        ";": r"\;", " ": r"\ "
    }))

def generate_full_text_query(input: str) -> str:
    full_text_query = ""
    words = [el for el in remove_lucene_chars(input).split() if el]
    for word in words[:-1]:
        full_text_query += f" {word}~2 AND"
    full_text_query += f" {words[-1]}~2"
    return full_text_query.strip()

def retrieve_data_from_neo4j(question: str) -> str:
    result = ""
    entities = entity_chain.invoke({"question": question})
    for entity in entities.names:
        response = graph.query(
            """CALL db.index.fulltext.queryNodes('entity', $query, {limit:2})
            YIELD node,score
            CALL {
              WITH node
              MATCH (node)-[r:!MENTIONS]->(neighbor)
              RETURN node.id + ' - ' + type(r) + ' -> ' + neighbor.id AS output
            }
            RETURN output LIMIT 50
            """,
            {"query": generate_full_text_query(entity)},
        )
        result += "\n".join([el['output'] for el in response])
    return result

# Function to generate audio with Eleven Labs TTS
def generate_audio_elevenlabs(text):
    XI_API_KEY = os.environ['ELEVENLABS_API']
    VOICE_ID = 'ehbJzYLQFpwbJmGkqbnW'
    tts_url = f"https://api.elevenlabs.io/v1/text-to-speech/{VOICE_ID}/stream"
    headers = {"Accept": "application/json", "xi-api-key": XI_API_KEY}
    data = {"text": str(text), "model_id": "eleven_multilingual_v2", "voice_settings": {"stability": 1.0}}
    response = requests.post(tts_url, headers=headers, json=data, stream=True)
    if response.ok:
        with tempfile.NamedTemporaryFile(delete=False, suffix=".mp3") as f:
            for chunk in response.iter_content(chunk_size=1024):
                if chunk:
                    f.write(chunk)
            return f.name
    return None

# ASR model setup using Whisper
model_id = 'openai/whisper-large-v3'
device = "cuda:0" if torch.cuda.is_available() else "cpu"
torch_dtype = torch.float16 if torch.cuda.is_available() else torch.float32
model = AutoModelForSpeechSeq2Seq.from_pretrained(model_id, torch_dtype=torch_dtype).to(device)
processor = AutoProcessor.from_pretrained(model_id)

pipe_asr = pipeline(
    "automatic-speech-recognition",
    model=model,
    tokenizer=processor.tokenizer,
    feature_extractor=processor.feature_extractor,
    max_new_tokens=128,
    chunk_length_s=15,
    batch_size=16,
    torch_dtype=torch_dtype,
    device=device
)

# Function to handle audio input, transcription, and Neo4j response generation
def transcribe_and_respond(audio):
    # Transcribe audio input
    audio_data = {"array": audio["data"], "sampling_rate": audio["sample_rate"]}
    transcription = pipe_asr(audio_data)["text"]
    logging.debug(f"Transcription: {transcription}")

    # Retrieve data from Neo4j based on transcription
    response_text = retrieve_data_from_neo4j(transcription)
    logging.debug(f"Neo4j Response: {response_text}")

    # Convert response to audio
    return generate_audio_elevenlabs(response_text)

# Define Gradio interface
with gr.Blocks() as demo:
    audio_input = gr.Audio(sources="microphone", type="numpy", label="Speak to Ask")  # Removed streaming mode for manual submission
    audio_output = gr.Audio(label="Response", type="filepath", autoplay=True, interactive=False)
    
    # "Submit Audio" button
    submit_button = gr.Button("Submit Audio")
    
    # Link the button to trigger response generation after clicking
    submit_button.click(
        fn=transcribe_and_respond,
        inputs=audio_input,
        outputs=audio_output
    )

# Launch Gradio interface
demo.launch(show_error=True, share=True)