requirements.txt

# Stable cohesive LangChain 0.2.x stack (removes incompatible langchain-huggingface)
python-dotenv==1.0.1

# Embeddings / Vector
sentence-transformers==2.7.0
faiss-cpu==1.8.0.post1
rank-bm25==0.2.2
fastembed==0.3.5  # NEW: fast lightweight embedding backend (enable with FAST_EMBED=1)
xxhash==3.4.1  # NEW: fast hashing for embedding cache

# LangChain ecosystem (aligned)
langchain==0.2.17
langchain-community==0.2.11
langchain-openai==0.1.17
# (No explicit langchain-core / langsmith pins; pulled compatible versions)
# Removed: langchain-huggingface (was forcing core>=0.3.59 + langsmith>=0.3.x)

# OpenAI / Azure
openai==1.40.6

# API / Web
fastapi==0.112.0
uvicorn==0.30.1

# Upload parsing
python-multipart

# Testing
httpx==0.27.0
pytest==8.3.1

# XLSX export
openpyxl==3.1.5

# Reinstall steps:
# 1) pip uninstall -y langchain-huggingface langchain-core langsmith || true
# 2) pip install --no-cache-dir --upgrade --force-reinstall -r requirements.txt
# If cache issues: pip cache purge

#Groq 
langchain-groq>=0.1.0