v0.12.0:2 - hotfix: pin NGC's torch versions so pip can't break the ABI

WhisperX docker build was crashing at the model-prewarm step:
  OSError: undefined symbol: torch_library_impl

Root cause: the NGC PyTorch base ships custom builds of torch +
torchaudio + torchvision matched together for Blackwell (sm_120). When
pip installed whisperx, it pulled the latest stock torchaudio wheel as
a transitive dep, which was compiled against a different libtorch and
won't load against NGC's.

Fix: at build time, capture NGC's actual torch/torchaudio/torchvision
versions into /tmp/torch-constraints.txt, then `pip install -c` that
constraint for all subsequent installs. pip can't swap torch out, so
the ABI stays consistent. whisperx and pyannote are happy with
torch>=2.0 — NGC's 2.10.0a0 satisfies that easily.

The pinned versions print to the build log so you can see them.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

image/whisperx_container/Dockerfile

@@ -26,10 +26,23 @@ RUN apt-get update \
  && apt-get install -y --no-install-recommends ffmpeg \
  && rm -rf /var/lib/apt/lists/*
 
-# Install whisperx + the FastAPI wrapper deps. --break-system-packages because
-# the NGC PyTorch image has its own managed Python that's flagged "system".
+# CRITICAL: the NGC base image ships custom builds of torch + torchaudio +
+# torchvision compiled together for Blackwell (sm_120). If pip pulls a stock
+# torchaudio wheel as a transitive dep of whisperx/pyannote, the resulting
+# ABI mismatch crashes at import time:
+#   "undefined symbol: torch_library_impl"
+# Generate a constraints.txt from whatever versions NGC actually shipped,
+# then pass it to every pip install so pip cannot swap torch out.
+RUN python3 -c "import torch, torchaudio, torchvision; \
+import sys; \
+sys.stdout.write(f'torch=={torch.__version__}\ntorchaudio=={torchaudio.__version__}\ntorchvision=={torchvision.__version__}\n')" \
+  > /tmp/torch-constraints.txt \
+ && echo '── pinned torch versions ──' && cat /tmp/torch-constraints.txt
+
+# Install whisperx + the FastAPI wrapper deps under the torch constraint.
 COPY requirements.txt /tmp/requirements.txt
-RUN pip install --break-system-packages --no-cache-dir -r /tmp/requirements.txt
+RUN pip install --break-system-packages --no-cache-dir \
+    -c /tmp/torch-constraints.txt -r /tmp/requirements.txt
 
 # Pre-warm the default Whisper + alignment models at build time so first-call
 # latency on a fresh container is small. (~3 GB cached into the image; if you