[New Feature] Support SAM 2.1 (#59)

* support sam 2.1

* refine config path and ckpt path

* update README

backend.Dockerfile

@@ -0,0 +1,64 @@
+ARG BASE_IMAGE=pytorch/pytorch:2.3.1-cuda12.1-cudnn8-runtime
+ARG MODEL_SIZE=base_plus
+
+FROM ${BASE_IMAGE}
+
+# Gunicorn environment variables
+ENV GUNICORN_WORKERS=1
+ENV GUNICORN_THREADS=2
+ENV GUNICORN_PORT=5000
+
+# SAM 2 environment variables
+ENV APP_ROOT=/opt/sam2
+ENV PYTHONUNBUFFERED=1
+ENV SAM2_BUILD_CUDA=0
+ENV MODEL_SIZE=${MODEL_SIZE}
+
+# Install system requirements
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+    libavutil-dev \
+    libavcodec-dev \
+    libavformat-dev \
+    libswscale-dev \
+    pkg-config \
+    build-essential \
+    libffi-dev
+
+COPY setup.py .
+COPY README.md .
+
+RUN pip install --upgrade pip setuptools
+RUN pip install -e ".[interactive-demo]"
+
+# https://github.com/Kosinkadink/ComfyUI-VideoHelperSuite/issues/69#issuecomment-1826764707
+RUN rm /opt/conda/bin/ffmpeg && ln -s /bin/ffmpeg /opt/conda/bin/ffmpeg
+
+# Make app directory. This directory will host all files required for the
+# backend and SAM 2 inference files.
+RUN mkdir ${APP_ROOT}
+
+# Copy backend server files
+COPY demo/backend/server ${APP_ROOT}/server
+
+# Copy SAM 2 inference files
+COPY sam2 ${APP_ROOT}/server/sam2
+
+# Download SAM 2.1 checkpoints
+ADD https://dl.fbaipublicfiles.com/segment_anything_2/092824/sam2.1_hiera_tiny.pt ${APP_ROOT}/checkpoints/sam2.1_hiera_tiny.pt
+ADD https://dl.fbaipublicfiles.com/segment_anything_2/092824/sam2.1_hiera_small.pt ${APP_ROOT}/checkpoints/sam2.1_hiera_small.pt
+ADD https://dl.fbaipublicfiles.com/segment_anything_2/092824/sam2.1_hiera_base_plus.pt ${APP_ROOT}/checkpoints/sam2.1_hiera_base_plus.pt
+ADD https://dl.fbaipublicfiles.com/segment_anything_2/092824/sam2.1_hiera_large.pt ${APP_ROOT}/checkpoints/sam2.1_hiera_large.pt
+
+WORKDIR ${APP_ROOT}/server
+
+# https://pythonspeed.com/articles/gunicorn-in-docker/
+CMD gunicorn --worker-tmp-dir /dev/shm \
+    --worker-class gthread app:app \
+    --log-level info \
+    --access-logfile /dev/stdout \
+    --log-file /dev/stderr \
+    --workers ${GUNICORN_WORKERS} \
+    --threads ${GUNICORN_THREADS} \
+    --bind 0.0.0.0:${GUNICORN_PORT} \
+    --timeout 60