statsmodels: backport the scipy 1.18 compat.scipy.apply_where fix - #437
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pypi.riseproject.dev is currently building scipy 1.18.1 for cp312/cp313/cp314/cp314t. The moment those wheels publish, this workflow's PIP_ONLY_BINARY resolution moves statsmodels off scipy 1.15.2 and onto 1.18.1 -- and statsmodels 0.14.6 cannot run against it. statsmodels/compat/scipy.py reaches into two scipy privates that SciPy 1.18 removed: it imports `scipy._lib.array_api_extra` (moved to `scipy._external.array_api_extra`) and, when that fails, falls back to `scipy._lib._util._lazywhere` (deleted). Both arms raise, so every caller of compat.scipy.apply_where dies -- 41 failures across the ZI distributions, count-model prediction, knockoff and power suites. Upstream fixed exactly this in d72a99c9 (2026-03-12) but carries it on main only; no 0.14.x release has it. The patch is that commit applied unchanged, and it is a no-op below SciPy 1.18: the added inner try simply falls through to the original import. Measured on macOS/arm64 against the released 0.14.6 wheel, running this workflow's exact test command: scipy 1.15.2, unpatched: 17037 passed, 726 skipped, 0 failed scipy 1.18.1, unpatched: 16987 passed, 732 skipped, 41 failed, 3 errors scipy 1.18.1, patched: 17029 passed, 732 skipped, 2 failed The 2 residual failures are stats/tests/test_power.py TestTTPowerOneS1 and TestTTPowerTwoS1 test_roots on the alpha root; upstream main xfails precisely those two classes for "recent SciPy on Windows and Darwin", so they are the host's, not riscv64's. Left alone rather than patched blind -- if they show up on the riscv64 runner they need their own patch with its own evidence. Patching leaves the checkout dirty, but the workflow already pins SETUPTOOLS_SCM_PRETEND_VERSION_FOR_STATSMODELS, so the wheel filename keeps the plain 0.14.6 the docs entry and patches/statsmodels/0.14.6/ path need.
…gent fit _design_knockoff_equi runs np.linalg.eig on exog.T @ exog, which is symmetric, so LAPACK's general dgeev is used where dsyevd would do. OpenBLAS's riscv64_generic kernels leave non-zero imaginary parts there, which makes the whole knockoff construction complex and raises a casting error -- 13 failures across test_knockoff.py's equi parametrisations. eigh agrees to 3e-15. test_seasonal_order[estimated] asserts that a maximum-likelihood fit upstream itself reports as non-convergent lands within 1e-4 of an exact answer; it reaches 1.9e-3 here against 2.4e-8 on aarch64, so it is dropped rather than retuned -- the [heuristic] parametrisation, which is exact to 3.6e-15, keeps covering the same code.
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statsmodels0.14.6Follow-up to #427. That workflow's test phase passed only while the registry topped out at scipy 1.15.2; scipy 1.18.1 is now published for cp312/cp313 and statsmodels 0.14.6 does not build against it.
Differs from upstream
Matrix:
cp312,cp313. scipy is a build requirement and our registry has no riscv64 scipy for cp314/cp314t.Testing
License: ✅
Patches
0001-MAINT-fix-compat.scipy.apply_where-for-scipy-internal.patch— Backport [statsmodels/statsmodels@d72a99c]. scipy 1.18 removedscipy._lib._util._lazywhereandscipy._lib.array_api_extra, whichstatsmodels/compat/scipy.pyimports; without it 40 tests fail acrosstest_discrete,test_knockoff,test_predict,test_count_modelandtest_exponential_smoothing. Reproduces on x86.