FROM python:3.8-slim

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    DEBIAN_FRONTEND=noninteractive \
    PIP_NO_CACHE_DIR=1

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    libopenblas-dev \
    git \
    curl \
    cmake \
    g++ \
    make \
    && rm -rf /var/lib/apt/lists/*

# Install Python packages in optimal order
COPY requirements.txt .
RUN pip install --upgrade pip setuptools wheel && \
    pip install torch==2.2.1 --index-url https://download.pytorch.org/whl/cpu && \
    pip install ninja==1.11.1 && \
    pip install transformers==4.38.2 && \
    pip install accelerate==0.27.2 && \
    pip install deepspeed==0.13.1 && \
    pip install datasets==2.18.0 && \
    pip install huggingface_hub==0.20.3 && \
    pip install unsloth==0.2.0 && \
    pip install vllm==0.3.0 --no-deps && \
    pip install fastapi==0.109.1 uvicorn==0.27.0

WORKDIR /app
COPY . /app
RUN mkdir -p /app/checkpoints /app/logs

CMD ["python", "train.py"]