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Dockerfile

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+FROM python:3.10-slim
+
+# System deps: needed by chromadb, sentence-transformers, and pymupdf (optional)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN useradd -m -u 1000 user
+USER user
+ENV PATH="/home/user/.local/bin:$PATH"
+
+WORKDIR /app
+
+COPY --chown=user requirements.txt /app/requirements.txt
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r /app/requirements.txt
+
+COPY --chown=user . /app
+
+# Hugging Face Spaces requires listening on 7860
+EXPOSE 7860
+
+CMD ["gunicorn", "-w", "1", "-b", "0.0.0.0:7860", "app:app"]

requirements.txt

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+flask==3.0.3
+gunicorn==22.0.0
+
+openai==1.40.6
+
+langchain-community==0.2.16
+langchain-text-splitters==0.2.2
+
+chromadb==0.5.5
+sentence-transformers==3.0.1
+
+# Often required by sentence-transformers / transformers stack
+torch==2.3.1
+transformers==4.43.3
+tokenizers==0.19.1
+numpy==1.26.4
+scipy==1.13.1
+
+# Optional but commonly needed if you rebuild the DB in-space
+pymupdf==1.24.9
+tiktoken==0.7.0