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fix: pull torch from CPU-only index to shrink backend image (3.3GB → ~588MB) #4686

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Merged
marcoacierno merged 1 commit into from
Jun 20, 2026
Merged

fix: pull torch from CPU-only index to shrink backend image (3.3GB → ~588MB) #4686

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16 changes: 16 additions & 0 deletions backend/pyproject.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,10 @@ dependencies = [
"opencv-python-headless>=4.10.0.84",
"psycopg[c]==3.2.12",
"sentence-transformers>=3.0.0",
# Declared directly so [tool.uv.sources] binds torch to the CPU index
# (sources only apply to direct deps). Otherwise it's transitive via
# sentence-transformers. See [tool.uv.sources] below.
"torch>=2.12.1",
"scikit-learn>=1.5.0",
"bertopic>=0.16.0",
"nltk>=3.9.4",
Expand Down Expand Up @@ -135,3 +139,15 @@ dev = [
"typer>=0.12.3",
"django-debug-toolbar>=5.0.1",
]

# Pull torch from the CPU-only PyTorch index. torch 2.12 declares CUDA deps
# for all Linux platforms (incl. arm64), which the universal lock would
# otherwise install — adding ~2.7GB of unusable nvidia/cuda wheels to the
# image. The +cpu wheels declare no nvidia deps. See #4672.
[tool.uv.sources]
torch = [{ index = "pytorch-cpu" }]

[[tool.uv.index]]
name = "pytorch-cpu"
url = "https://download.pytorch.org/whl/cpu"
explicit = true
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