Revert to gradio SDK with runtime --no-deps SA3 install for ZeroGPU

ZeroGPU is only available on the gradio SDK, not Docker, so the Docker
approach is a dead end. Go back to sdk: gradio and keep stable-audio-tools
out of requirements.txt entirely (its pyproject hard-pins torch==2.7.1,
which ZeroGPU rejects). Instead app.py installs it at import time with
pip --no-cache-dir --no-deps, so the ZeroGPU-managed torch is used and
SA3's torch pin is never resolved. requirements.txt supplies all of SA3's
non-torch dependencies up front.

- README front-matter: sdk docker -> gradio (restore sdk_version/app_file)
- Remove Dockerfile
- app.py: add --no-cache-dir to the runtime SA3 install

Dockerfile

@@ -1,50 +0,0 @@
-# CODA — HF Space (Docker SDK on ZeroGPU)
-#
-# Why Docker instead of the gradio SDK: stable-audio-tools hard-pins
-# torch==2.7.1 in its pyproject.toml. ZeroGPU only accepts torch
-# 2.8.0/2.9.1/2.10.0/2.11.0, so the gradio-SDK build fails resolving the pin.
-# Here we install a ZeroGPU-compatible torch first, then install
-# stable-audio-tools with --no-deps so its torch pin is ignored, and supply all
-# of SA3's actual (non-torch) dependencies ourselves via requirements.txt.
-
-FROM python:3.10-slim
-
-# System libs: ffmpeg for audio I/O, libsndfile1 for soundfile, git so pip can
-# install stable-audio-tools straight from its repo.
-RUN apt-get update && apt-get install -y --no-install-recommends \
-        ffmpeg \
-        libsndfile1 \
-        git \
-    && rm -rf /var/lib/apt/lists/*
-
-# HF Spaces convention: run as a non-root user with UID 1000.
-RUN useradd -m -u 1000 user
-USER user
-ENV HOME=/home/user \
-    PATH=/home/user/.local/bin:$PATH \
-    PYTHONUNBUFFERED=1 \
-    HF_HOME=/home/user/.cache/huggingface \
-    GRADIO_SERVER_NAME=0.0.0.0 \
-    GRADIO_SERVER_PORT=7860
-
-WORKDIR $HOME/app
-
-# Install the Python deps first (own layer, so code edits don't bust the cache).
-# requirements.txt pins torch==2.8.0+cu124 (ZeroGPU-compatible) plus every
-# non-torch dependency SA3 needs.
-COPY --chown=user:user requirements.txt .
-RUN pip install --no-cache-dir --upgrade pip \
-    && pip install --no-cache-dir -r requirements.txt
-
-# Install stable-audio-tools WITHOUT its dependency tree, so its torch==2.7.1
-# pin never gets resolved — the ZeroGPU-compatible torch above is used instead.
-RUN pip install --no-cache-dir --no-deps \
-        git+https://github.com/Stability-AI/stable-audio-tools.git
-
-# App code last.
-COPY --chown=user:user . .
-
-# HF Spaces serves the container on port 7860.
-EXPOSE 7860
-
-CMD ["python", "app.py"]

README.md

@@ -3,8 +3,10 @@ title: CODA
 emoji: 🎵
 colorFrom: indigo
 colorTo: yellow
-sdk: docker
-app_port: 7860
+sdk: gradio
+sdk_version: 6.16.0
+python_version: '3.10'
+app_file: app.py
 pinned: false
 license: mit
 short_description: AI that finishes the song you quit on.

app.py

@@ -17,7 +17,8 @@ try:
     import stable_audio_tools as _  # noqa: F401
     del _
 except ImportError:
-    _sp.check_call([_sys.executable, "-m", "pip", "install", "--no-deps", "-q",
+    _sp.check_call([_sys.executable, "-m", "pip", "install",
+                    "--no-cache-dir", "--no-deps", "-q",
                     "git+https://github.com/Stability-AI/stable-audio-tools.git"])
 del _sp, _sys