Dockerfile

## the base or builder stage commands

# decide on the python version
FROM python:3.12.10-slim-bookworm AS base

# get the build essential tools
RUN apt-get update && apt-get install --no-install-recommends -y \
    curl ca-certificates && \
    apt-get clean && rm -rf /var/lib/apt/lists/* ~/.cache/

# download the latest version of uv
ADD https://astral.sh/uv/0.7.3/install.sh /install.sh
RUN chmod -R 655 /install.sh && /install.sh && rm /install.sh

# add uv to path
ENV PATH="/root/.local/bin:${PATH}"

# define work directory
WORKDIR /app

# copy the env setup file only
COPY pyproject.toml ./pyproject.toml

RUN uv sync --no-cache-dir --compile-bytecode \
    --no-install-project --verbose

# add app env var to path
ENV PATH="/app/.venv/bin:$PATH"

# model export to onnx
RUN optimum-cli export onnx \
    --opset 14 --task text-classification \
    --framework pt --dtype fp32 --device cpu \
    --model climatebert/distilroberta-base-climate-sentiment \
    distilroberta-base-climate-sentiment-onnx

# model quantization
RUN optimum-cli onnxruntime quantize --avx512_vnni --per_channel \
    --onnx_model distilroberta-base-climate-sentiment-onnx \
    -o distilroberta-base-climate-sentiment-onnx-quantized

# ------------------------------------------------------- #

## the main or production stage commands

# same python version as base / builder stage
FROM python:3.12.10-slim-bookworm AS main

# create a non-root user
RUN useradd --create-home app_user
USER app_user

# define work directory
WORKDIR /app

# copy env files from base to main image
COPY --from=base /app/.venv ./.venv
COPY --from=base /app/distilroberta-base-climate-sentiment-onnx-quantized \
    ./distilroberta-base-climate-sentiment-onnx-quantized

# add app env var to path
ENV PATH="/app/.venv/bin:$PATH"

# copy project folders and files into image
COPY main.py ./main.py
COPY static ./static

# expose the port
EXPOSE 7860

# start the application
CMD ["uvicorn", "main:app", "--log-level", "info", "--host", "0.0.0.0" , "--port", "7860", "--workers", "1"]