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# 🧠 YouTube Transcript Chatbot (RAG) — LLaMA, Gemma, DeepSeek, OpenAI
An advanced **Retrieval-Augmented Generation (RAG)** chatbot that answers questions from YouTube video transcripts using top open-source LLMs — **Llama 3.2**, **Gemma 2**, **DeepSeek**, and **OpenAI GPT-OSS**.
Built with **Streamlit**, **LangChain**, **Hugging Face Hub**, and **FAISS**.
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## 🚀 Features
✅ Fetch YouTube transcripts via **RapidAPI**
✅ Embed and store transcript chunks using **FAISS**
✅ Query understanding through **LangChain retrieval pipeline**
✅ Supports **multiple Hugging Face chat-based models**:
- 🦙 **Llama-3.2-1B-Instruct**
- 💎 **Gemma-2-2B-it**
- 🧠 **DeepSeek-V3.2-Exp**
- 🔮 **OpenAI GPT-OSS-20B**
✅ Adjustable **temperature** for creative or factual outputs
✅ Seamless **Streamlit UI**
✅ Caching for faster repeat queries
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## 🧩 Architecture
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## 🧠 Tech Stack
| Component | Technology |
|------------|-------------|
| Frontend | Streamlit |
| Backend | LangChain |
| LLMs | Hugging Face Endpoints |
| Embeddings | intfloat/multilingual-e5-base |
| Vector Store | FAISS |
| API | YouTube Transcript API (RapidAPI) |
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