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Backtrack to non-local versions when wheels are missing platform support (#10046)

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## Summary

This is yet another variation on
https://github.com/astral-sh/uv/pull/9928, with a few minor changes:

1. It only applies to local versions (e.g., `2.5.1+cpu`).
2. It only _considers_ the non-local version as an alternative (e.g.,
`2.5.1`).
3. It only _considers_ the non-local alternative if it _does_ support
the unsupported platform.
4. Instead of failing, it falls back to using the local version.

So, this is far less strict, and is effectively designed to solve
PyTorch but nothing else. It's also not user-configurable, except by way
of using `environments` to exclude platforms.
This commit is contained in:
Charlie Marsh 2024-12-20 14:11:27 -05:00 • committed by GitHub
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commit 2c68dfd4a9
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20
docs/guides/integration/pytorch.md
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@ -114,16 +114,13 @@ Next, update the `pyproject.toml` to point `torch` and `torchvision` to the desi
=== "CPU-only"
PyTorch doesn't publish CPU-only builds for macOS, since macOS builds are always considered CPU-only.
As such, we gate on `platform_system` to instruct uv to ignore the PyTorch index when resolving for macOS.
```toml
[tool.uv.sources]
torch = [
{ index = "pytorch-cpu", marker = "platform_system != 'Darwin'"},
{ index = "pytorch-cpu" },
]
torchvision = [
{ index = "pytorch-cpu", marker = "platform_system != 'Darwin'"},
{ index = "pytorch-cpu" },
]
```
@ -201,10 +198,10 @@ dependencies = [
[tool.uv.sources]
torch = [
{ index = "pytorch-cpu", marker = "platform_system != 'Darwin'" },
{ index = "pytorch-cpu" },
]
torchvision = [
{ index = "pytorch-cpu", marker = "platform_system != 'Darwin'" },
{ index = "pytorch-cpu" },
]
[[tool.uv.index]]
@ -290,11 +287,11 @@ conflicts = [
[tool.uv.sources]
torch = [
{ index = "pytorch-cpu", extra = "cpu", marker = "platform_system != 'Darwin'" },
{ index = "pytorch-cpu", extra = "cpu" },
{ index = "pytorch-cu124", extra = "cu124" },
]
torchvision = [
{ index = "pytorch-cpu", extra = "cpu", marker = "platform_system != 'Darwin'" },
{ index = "pytorch-cpu", extra = "cpu" },
{ index = "pytorch-cu124", extra = "cu124" },
]
@ -311,9 +308,8 @@ explicit = true
!!! note
Since GPU-accelerated builds aren't available on macOS, the above configuration will continue to use
the CPU-only builds on macOS via the `"platform_system != 'Darwin'"` marker, regardless of the extra
provided.
Since GPU-accelerated builds aren't available on macOS, the above configuration will fail to install
on macOS when the `cu124` extra is enabled.
## The `uv pip` interface