ryankert01 opened a new pull request, #1413:
URL: https://github.com/apache/mahout/pull/1413
### Related Issues
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### Changes
- [x] CI/CD pipeline
### Why
The Python Testing workflow rebuilt the QDP extension independently in every
matrix leg (3.10 / 3.11 / 3.12), compiling the same Rust code three times.
The
legs run in parallel, so this duplicated CI compute (billed minutes) without
buying any wall-clock speedup.
### How
- Add a `build` job that compiles the CPU / no-CUDA stub wheels for all
supported interpreters **once** and uploads them as an artifact.
- Rewire the `test` matrix to `needs: build`: it downloads the artifact and
installs the wheel matching each leg's interpreter instead of recompiling.
- `QDP_NO_CUDA=1` makes the stub build explicit, matching the prior per-leg
behaviour (which fell back to stubs because `nvcc` is absent on the runner
—
see `qdp/qdp-core/build.rs` and `qdp/qdp-kernels/build.rs`).
Net effect: the heavy non-pyo3 crates compile a single time instead of once
per
leg. The `rust-check` gate, the test environment setup, and the `pytest`
invocation are otherwise unchanged. The CUDA wheel build in `wheel-build.yml`
(used for distribution) is intentionally left as-is.
Job graph: `rust-check → build → test (matrix)`.
## Checklist
- [ ] Added or updated unit tests for all changes <!-- n/a: CI-only change
-->
- [ ] Added or updated documentation for all changes <!-- n/a -->
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