Dockerfile

# Use python 3.10 or 3.11
FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1
ENV MLP_MODEL_PATH=ai_voice_detection/artifacts/best_mlp_classifier.pt

# Set work directory
WORKDIR /app

# Install system dependencies (required for torchaudio to load mp3)
RUN apt-get update && apt-get install -y \
    ffmpeg \
    libsndfile1 \
    && rm -rf /var/lib/apt/lists/*

# Create a user to avoid running as root (good practice for HF spaces)
RUN useradd -m -u 1000 user && \
    chown -R user:user /app

USER user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH

# Install dependencies
COPY --chown=user requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    # Install CPU-only PyTorch first (significantly reduces image size)
    pip install --no-cache-dir "torch>=2.2.0" "torchaudio>=2.2.0" --index-url https://download.pytorch.org/whl/cpu && \
    # Explicitly install pydub to ensure it's present
    pip install --no-cache-dir pydub && \
    # Install other dependencies, excluding ONLY torch to avoid overwriting with CUDA version
    grep -v "torch" requirements.txt > requirements_no_torch.txt && \
    pip install --no-cache-dir -r requirements_no_torch.txt

# Copy application code
# We copy the entire current directory into /app. 
# HF Spaces usually mounts the repo at /app anyway, but COPY is safer for docker builds.
COPY --chown=user . .

# Expose port 7860 for Hugging Face Spaces
EXPOSE 7860

# Command to run the application
# We run from /app, so 'ai_voice_detection.api.main' is the module path relative to workdir
# OR if we cd into ai_voice_detection...
# Let's import as module. The structure is:
# /app/ai_voice_detection/api/main.py
# /app/ai_voice_detection/inference/...
# So python path /app should work. 
# "api.main" implies ai_voice_detection is not part of module path if we are in ai_voice_detection.
# If we are in /app, it should be "ai_voice_detection.api.main:app".
# Let's adjust main.py imports check?
# main.py does "from inference.predict import ...". 
# This typically requires that the parent directory of 'inference' is in PYTHONPATH.
# That is /app/ai_voice_detection.
# So we should probably set WORKDIR to /app/ai_voice_detection or add it to PYTHONPATH.
# Setting PYTHONPATH is cleaner.

ENV PYTHONPATH=$PYTHONPATH:/app/ai_voice_detection

CMD ["uvicorn", "ai_voice_detection.api.main:app", "--host", "0.0.0.0", "--port", "7860"]