Create app.py

app.py

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+# -*- coding: utf-8 -*-
+"""app
+Automatically generated by Colab.
+Original file is located at
+    https://colab.research.google.com/drive/1pwwcBb5Zlw1DA3u5K8W8mjrwBTBWXc1L
+"""
+
+import gradio as gr
+import numpy as np
+from transformers import pipeline
+import os
+import time
+import groq
+import uuid
+
+# LangChain imports
+from langchain_core.messages import HumanMessage, SystemMessage, AIMessage
+from langchain_text_splitters import RecursiveCharacterTextSplitter
+from langchain_core.documents import Document
+from langchain_community.embeddings import HuggingFaceEmbeddings
+from langchain_community.vectorstores import Chroma
+from langchain_groq import ChatGroq
+
+# Other imports
+import chardet
+import fitz  # PyMuPDF for PDFs
+import docx  # python-docx for Word files
+import gtts  # Google Text-to-Speech library
+from pptx import Presentation  # python-pptx for PowerPoint files
+import re
+
+import torch
+import torchaudio
+from transformers import pipeline, WhisperProcessor, WhisperForConditionalGeneration
+
+# Set API Key
+groq.api_key = os.getenv("GROQ_API_KEY")
+
+# Initialize Chat Model
+chat_model = ChatGroq(model_name="llama-3.3-70b-versatile", api_key=groq.api_key)
+
+# Initialize Embeddings and chromaDB
+os.makedirs("chroma_db", exist_ok=True)
+embedding_model = HuggingFaceEmbeddings(model_name="sentence-transformers/all-MiniLM-L6-v2")
+vectorstore = Chroma(
+    embedding_function=embedding_model,
+    persist_directory="chroma_db"
+)
+
+# Short-term memory for the LLM
+chat_memory = []
+
+# Prompt for quiz generation
+quiz_prompt = """
+You are an AI assistant specialized in education and assessment creation. Given an uploaded document or text, generate a quiz with a mix of multiple-choice questions (MCQs) and fill-in-the-blank questions. The quiz should be directly based on the key concepts, facts, and details from the provided material.
+Generate 20 Questions.
+Remove all unnecessary formatting generated by the LLM, including <think> tags, asterisks, markdown formatting, and any bold or italic text, as well as **, ###, ##, and # tags.
+For each question:
+- Provide 4 answer choices (for MCQs), with only one correct answer.
+- Ensure fill-in-the-blank questions focus on key terms, phrases, or concepts from the document.
+- Include an answer key for all questions.
+- Ensure questions vary in difficulty and encourage comprehension rather than memorization.
+- Additionally, implement an instant feedback mechanism:
+    - When a user selects an answer, indicate whether it is correct or incorrect.
+    - If incorrect, provide a brief explanation from the document to guide learning.
+    - Ensure responses are concise and educational to enhance understanding.
+Output Example:
+1. Fill in the blank: The LLM Agent framework has a central decision-making unit called the _______________________.
+Answer: Agent Core
+Feedback: The Agent Core is the central component of the LLM Agent framework, responsible for managing goals, tool instructions, planning modules, memory integration, and agent persona.
+2. What is the main limitation of LLM-based applications?
+a) Limited token capacity
+b) Lack of domain expertise
+c) Prone to hallucination
+d) All of the above
+Answer: d) All of the above
+Feedback: LLM-based applications have several limitations, including limited token capacity, lack of domain expertise, and being prone to hallucination, among others.
+3. Given the following info, what is the value of P(jam|Rain)?
+P(no Rain) = 0.8;
+P(no Jam) = 0.2;
+P(Rain|Jam) = 0.1
+a) 0.016
+b) 0.025
+c) 0.1
+d) 0.4
+Answer: d) 0.4
+Feedback: This question tests understanding of Bayes' Theorem by requiring the calculation of conditional probability using the given values.
+"""
+
+# Enhanced Whisper Transcriber with Chunked Processing
+class EnhancedWhisperTranscriber:
+    def __init__(self, model_name=None):
+        # Auto-select optimal model based on hardware
+        if model_name is None:
+            model_name = self.get_optimal_model()
+        
+        self.device = 0 if torch.cuda.is_available() else "cpu"
+        self.model_name = model_name
+        
+        print(f"Initializing Whisper model: {model_name} on {self.device}")
+        
+        self.pipe = pipeline(
+            task="automatic-speech-recognition",
+            model=model_name,
+            chunk_length_s=30,  # Process in 30-second chunks
+            stride_length_s=5,  # 5-second overlap between chunks
+            device=self.device,
+            torch_dtype=torch.float16 if torch.cuda.is_available() else torch.float32,
+        )
+    
+    def get_optimal_model(self):
+        """Automatically select the best model for available hardware"""
+        if torch.cuda.is_available():
+            gpu_memory = torch.cuda.get_device_properties(0).total_memory / 1e9
+            if gpu_memory > 8:  # 8GB+ VRAM
+                return "openai/whisper-small.en"
+            else:  # Limited VRAM
+                return "openai/whisper-base.en"
+        else:  # CPU only
+            return "openai/whisper-base.en"  # Balanced choice for CPU
+    
+    def transcribe_numpy(self, sr, y, return_timestamps=False):
+        """Transcribe numpy array audio with chunked processing"""
+        try:
+            # Enhanced audio preprocessing
+            if y.ndim > 1:
+                y = y.mean(axis=1)  # Convert to mono
+            
+            y = y.astype(np.float32)
+            
+            # Normalize audio
+            max_val = np.max(np.abs(y))
+            if max_val > 0:
+                y = y / max_val
+            
+            # Remove silence (simple threshold-based)
+            silence_threshold = 0.01
+            non_silent_indices = np.where(np.abs(y) > silence_threshold)[0]
+            
+            if len(non_silent_indices) == 0:
+                return "No speech detected. Please speak louder or check your microphone."
+            
+            # Trim silence from beginning and end
+            start_idx = non_silent_indices[0]
+            end_idx = non_silent_indices[-1]
+            y_trimmed = y[start_idx:end_idx+1]
+            
+            # Check if audio is too short
+            if len(y_trimmed) / sr < 0.5:  # Less than 0.5 seconds
+                return "Audio too short. Please speak for at least 1-2 seconds."
+            
+            # Create audio dict for pipeline
+            inputs = {"array": y_trimmed, "sampling_rate": sr}
+            
+            # Enhanced transcription with chunked processing
+            result = self.pipe(
+                inputs,
+                batch_size=4,  # Optimal batch size for chunked processing
+                generate_kwargs={"task": "transcribe"},
+                return_timestamps=return_timestamps
+            )
+            
+            text = result["text"].strip()
+            
+            if not text:
+                return "No clear speech detected. Try speaking more clearly or in a quieter environment."
+            
+            return text
+            
+        except Exception as e:
+            error_msg = f"Transcription error: {str(e)}"
+            print(error_msg)
+            return f"Sorry, I couldn't process the audio. Please try again or type your message instead."
+
+# Initialize the enhanced transcriber
+transcriber = EnhancedWhisperTranscriber()
+
+def get_transcription_status(audio):
+    """Provide status feedback for transcription"""
+    if audio is None:
+        return "Ready to record audio"
+    
+    sr, y = audio
+    duration = len(y) / sr if sr > 0 else 0
+    
+    if duration < 0.5:
+        return "Audio too short - please record at least 1 second"
+    elif duration > 60 and not torch.cuda.is_available():
+        return "Long audio detected on CPU - this may take a while..."
+    else:
+        device = "GPU" if torch.cuda.is_available() else "CPU"
+        return f"Processing {duration:.1f}s audio on {device}..."
+
+def transcribe_audio(audio):
+    """Main transcription function with progress feedback"""
+    if audio is None:
+        return "Please record audio first"
+    
+    # Show device info for debugging
+    device_type = "GPU" if torch.cuda.is_available() else "CPU"
+    print(f"Transcribing on {device_type} using {transcriber.model_name}")
+    
+    sr, y = audio
+    
+    # For CPU users, we might want to show a warning for long audio
+    audio_duration = len(y) / sr if sr > 0 else 0
+    if not torch.cuda.is_available() and audio_duration > 30:  # Longer than 30 seconds on CPU
+        print("Warning: Long audio on CPU - transcription may take a while...")
+    
+    # Use the enhanced transcriber
+    result = transcriber.transcribe_numpy(sr, y)
+    
+    # Log transcription result for debugging
+    print(f"Transcription result: {result[:100]}...")
+    
+    return result
+
+# Function to clean AI response by removing unwanted formatting
+def clean_response(response):
+    """Removes <think> tags, asterisks, and markdown formatting."""
+    cleaned_text = re.sub(r"<think>.*?</think>", "", response, flags=re.DOTALL)
+    cleaned_text = re.sub(r"(\*\*|\*|\[|\])", "", cleaned_text)
+    cleaned_text = re.sub(r"^##+\s*", "", cleaned_text, flags=re.MULTILINE)
+    cleaned_text = re.sub(r"\\", "", cleaned_text)
+    cleaned_text = re.sub(r"---", "", cleaned_text)
+    return cleaned_text.strip()
+
+# Function to generate quiz based on content
+def generate_quiz(content):
+    prompt = f"{quiz_prompt}\n\nDocument content:\n{content}"
+    response = chat_model.invoke([HumanMessage(content=prompt)])
+    cleaned_response = clean_response(response.content)
+    return cleaned_response
+
+# Function to retrieve relevant documents from vectorstore based on user query
+def retrieve_documents(query):
+    results = vectorstore.similarity_search(query, k=3)
+    return [doc.page_content for doc in results]
+
+# Function to convert tuple format to message format
+def convert_to_message_format(chat_history):
+    message_format = []
+    for user_msg, bot_msg in chat_history:
+        message_format.append({"role": "user", "content": user_msg})
+        message_format.append({"role": "assistant", "content": bot_msg})
+    return message_format
+
+# Function to convert message format to tuple format for processing
+def convert_to_tuple_format(chat_history):
+    tuple_format = []
+    for i in range(0, len(chat_history), 2):
+        if i+1 < len(chat_history):
+            user_msg = chat_history[i]["content"]
+            bot_msg = chat_history[i+1]["content"]
+            tuple_format.append((user_msg, bot_msg))
+    return tuple_format
+
+# Function to handle chatbot interactions with short-term memory
+def chat_with_groq(user_input, chat_history):
+    try:
+        # Convert message format to tuple format for processing
+        tuple_history = convert_to_tuple_format(chat_history)
+        
+        # Retrieve relevant documents for additional context
+        relevant_docs = retrieve_documents(user_input)
+        context = "\n".join(relevant_docs) if relevant_docs else "No relevant documents found."
+
+        # Construct proper prompting with conversation history
+        system_prompt = "You are a helpful AI assistant. Answer questions accurately and concisely."
+        conversation_history = "\n".join(chat_memory[-10:])
+        prompt = f"{system_prompt}\n\nConversation History:\n{conversation_history}\n\nUser Input: {user_input}\n\nContext:\n{context}"
+
+        # Call the chat model
+        response = chat_model.invoke([HumanMessage(content=prompt)])
+
+        # Clean response to remove any unwanted formatting
+        cleaned_response_text = clean_response(response.content)
+
+        # Append conversation history
+        chat_memory.append(f"User: {user_input}")
+        chat_memory.append(f"AI: {cleaned_response_text}")
+
+        # Update chat history
+        chat_history.append({"role": "user", "content": user_input})
+        chat_history.append({"role": "assistant", "content": cleaned_response_text})
+
+        # Convert response to speech
+        audio_file = speech_playback(cleaned_response_text)
+
+        return chat_history, "", audio_file
+    except Exception as e:
+        error_msg = f"Error: {str(e)}"
+        chat_history.append({"role": "user", "content": user_input})
+        chat_history.append({"role": "assistant", "content": error_msg})
+        return chat_history, "", None
+
+# Function to play response as speech using gTTS
+def speech_playback(text):
+    try:
+        # Generate a unique filename for each audio file
+        unique_id = str(uuid.uuid4())
+        audio_file = f"output_audio_{unique_id}.mp3"
+
+        # Convert text to speech
+        tts = gtts.gTTS(text, lang='en')
+        tts.save(audio_file)
+
+        # Return the path to the audio file
+        return audio_file
+    except Exception as e:
+        print(f"Error in speech_playback: {e}")
+        return None
+
+# Function to detect encoding safely
+def detect_encoding(file_path):
+    try:
+        with open(file_path, "rb") as f:
+            raw_data = f.read(4096)
+            detected = chardet.detect(raw_data)
+            encoding = detected["encoding"]
+        return encoding if encoding else "utf-8"
+    except Exception:
+        return "utf-8"
+
+# Function to extract text from PDF
+def extract_text_from_pdf(pdf_path):
+    try:
+        doc = fitz.open(pdf_path)
+        text = "\n".join([page.get_text("text") for page in doc])
+        return text if text.strip() else "No extractable text found."
+    except Exception as e:
+        return f"Error extracting text from PDF: {str(e)}"
+
+# Function to extract text from Word files (.docx)
+def extract_text_from_docx(docx_path):
+    try:
+        doc = docx.Document(docx_path)
+        text = "\n".join([para.text for para in doc.paragraphs])
+        return text if text.strip() else "No extractable text found."
+    except Exception as e:
+        return f"Error extracting text from Word document: {str(e)}"
+
+# Function to extract text from PowerPoint files (.pptx)
+def extract_text_from_pptx(pptx_path):
+    try:
+        presentation = Presentation(pptx_path)
+        text = ""
+        for slide in presentation.slides:
+            for shape in slide.shapes:
+                if hasattr(shape, "text"):
+                    text += shape.text + "\n"
+        return text if text.strip() else "No extractable text found."
+    except Exception as e:
+        return f"Error extracting text from PowerPoint: {str(e)}"
+
+# Function to process documents safely
+def process_document(file):
+    try:
+        file_extension = os.path.splitext(file.name)[-1].lower()
+        if file_extension in [".png", ".jpg", ".jpeg"]:
+            return "Error: Images cannot be processed for text extraction."
+        if file_extension == ".pdf":
+            content = extract_text_from_pdf(file.name)
+        elif file_extension == ".docx":
+            content = extract_text_from_docx(file.name)
+        elif file_extension == ".pptx":
+            content = extract_text_from_pptx(file.name)
+        else:
+            encoding = detect_encoding(file.name)
+            with open(file.name, "r", encoding=encoding, errors="replace") as f:
+                content = f.read()
+        text_splitter = RecursiveCharacterTextSplitter(chunk_size=500, chunk_overlap=50)
+        documents = [Document(page_content=chunk) for chunk in text_splitter.split_text(content)]
+        vectorstore.add_documents(documents)
+
+        quiz = generate_quiz(content)
+        return f"Document processed successfully (File Type: {file_extension}). Quiz generated:\n{quiz}"
+    except Exception as e:
+        return f"Error processing document: {str(e)}"
+
+# Clear chat history function
+def clear_chat_history():
+    chat_memory.clear()
+    return [], None
+
+def tutor_ai_chatbot():
+    """Main Gradio interface for the Tutor AI Chatbot."""
+    with gr.Blocks() as app:
+        gr.Markdown("# AI Tutor - We.(POC)")
+        gr.Markdown("An interactive Personal AI Tutor chatbot to help with your learning needs.")
+
+        # Chatbot Tab
+        with gr.Tab("AI Chatbot"):
+            with gr.Row():
+                with gr.Column(scale=3):
+                    chatbot = gr.Chatbot(height=500, type="messages")
+                    
+                with gr.Column(scale=1):
+                    audio_playback = gr.Audio(label="Audio Response", type="filepath")
+            
+            # Move the input controls here to span full width
+            with gr.Row():
+                msg = gr.Textbox(
+                    label="Ask a question", 
+                    placeholder="Type your question here...",
+                    container=False
+                )
+                submit = gr.Button("Send")
+            
+            with gr.Row():
+                with gr.Column(scale=1):
+                    audio_input = gr.Audio(type="numpy", label="Record or Upload Audio")
+            
+            # Add transcription status indicator
+            transcription_status = gr.Textbox(
+                label="Transcription Status",
+                interactive=False,
+                value="Record audio to see status here",
+                max_lines=2
+            )
+            
+            # Voice recording tips - ONLY in AI Chatbot tab
+            with gr.Accordion("Voice Recording Tips", open=False):
+                gr.Markdown("""
+                **For better speech recognition accuracy:**
+                - Speak clearly and at a moderate pace
+                - Record in a quiet environment  
+                - Keep the microphone close to your mouth (10-15 cm)
+                - Use a good quality microphone if possible
+                - Review the transcribed text before sending
+                - If transcription is poor, try recording again or type manually
+                
+                **Performance Info:**
+                - GPU: Fast transcription (2-5 seconds)
+                - CPU: Slower but functional (10-30 seconds for longer audio)
+                - Using model: whisper-base.en (optimized for accuracy/speed balance)
+                """)
+            
+            # Clear chat history button
+            clear_btn = gr.Button("Clear Chat")
+
+            # Handle chat interaction
+            submit.click(
+                chat_with_groq,
+                inputs=[msg, chatbot],
+                outputs=[chatbot, msg, audio_playback]
+            )
+
+            # Clear chat history function
+            clear_btn.click(
+                lambda: [],
+                inputs=None, 
+                outputs=[chatbot]
+            )
+
+            # Also allow Enter key to submit
+            msg.submit(
+                chat_with_groq,
+                inputs=[msg, chatbot],
+                outputs=[chatbot, msg, audio_playback]
+            )
+
+            # Add some examples of questions students might ask
+            with gr.Accordion("Example Questions", open=False):
+                gr.Examples(
+                    examples=[
+                        "Can you explain the concept of RLHF AI?",
+                        "What are AI transformers?",
+                        "What is MoE AI?",
+                        "What's gate networks AI?",
+                        "I am making a switch, please generating baking recipe?"
+                    ],
+                    inputs=msg
+                )
+
+            # Connect audio input to transcription with status updates
+            audio_input.change(
+                fn=get_transcription_status,
+                inputs=audio_input,
+                outputs=transcription_status
+            ).then(
+                fn=transcribe_audio,
+                inputs=audio_input,
+                outputs=msg
+            ).then(
+                fn=lambda x: "Transcription completed!" if x and x != "Please record audio first" else "Ready for new recording",
+                inputs=msg,
+                outputs=transcription_status
+            )
+
+        # Upload Notes & Generate Quiz Tab
+        with gr.Tab("Upload Notes & Generate Quiz"):
+            with gr.Row():
+                with gr.Column(scale=2):
+                    file_input = gr.File(label="Upload Lecture Notes (PDF, DOCX, PPTX)")
+                with gr.Column(scale=3):
+                    quiz_output = gr.Textbox(label="Generated Quiz", lines=10)
+
+            # Connect file input to document processing
+            file_input.change(process_document, inputs=file_input, outputs=quiz_output)
+
+        # Introduction Video Tab - Now with the working video
+        with gr.Tab("Introduction Video"):
+            with gr.Row():
+                with gr.Column(scale=1):
+                    gr.Markdown("### Welcome to the Introduction Video")
+                    gr.Markdown("Music from Xu Mengyuan - China-O, musician Xu Mengyuan YUAN! | 徐梦圆 - China-O 音乐人徐梦圆YUAN!")
+                    # Use the local video file that's stored in your Space
+                    gr.Video("We_not_me_video.mp4", label="Introduction Video")
+
+        # Launch the application
+        app.launch(share=False)
+
+# Launch the AI chatbot
+if __name__ == "__main__":
+    tutor_ai_chatbot()