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requirements.txt

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+# Web framework
+fastapi>=0.111.0
+uvicorn[standard]>=0.29.0
+python-multipart>=0.0.9
+
+# Data validation
+pydantic>=2.0.0
+pydantic-settings>=2.0.0
+
+# LangChain stack
+langchain-core>=0.2.0
+langchain-community>=0.2.0
+langchain-huggingface>=0.0.3
+langchain-openai>=0.1.0
+langchain-text-splitters>=0.2.0
+
+# Vector DB
+faiss-cpu>=1.7.4
+
+# Embeddings & reranking
+sentence-transformers>=2.7.0
+transformers>=4.40.0
+torch>=2.0.0
+huggingface-hub>=0.23.0
+
+# Sparse retrieval
+rank-bm25>=0.2.2
+
+# LLM API
+openai>=1.30.0
+
+# Tokenisation
+tiktoken>=0.7.0
+
+# Document loading
+pypdf>=4.2.0
+
+# Caching (Redis optional — falls back to in-memory)
+redis>=5.0.0
+
+# Utilities
+numpy>=1.26.0
+scikit-learn>=1.4.0
+httpx>=0.27.0
+google-crc32c>=1.5.0