BUG: return 0 not NaN when thresholding zeros at value 0 - #878
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rgommers merged 1 commit intoSep 17, 2026
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soft/garrote/firm used 1 - value/|x|, which is 0/0 → NaN when both are zero. Ignore the invalid warning and zero those entries. Co-authored-by: CenFangyu <Dmao233@users.noreply.github.com>
pavelkomarov
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Sep 17, 2026
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Fixes #866.
soft/nn_garrote/threshold_firmused1 - value/|x|. Whenvalue == 0andx == 0that is0/0→ NaN (clip does not clean NaN). Soft thresholding is defined assign(x)·max(|x|−λ, 0), which is 0 forx == 0at anyλ ≥ 0.Ignore the invalid divide and write 0 for
|x| == 0after the multiply (keeps dtype, including complex). Adds a regression test for soft/garrote/firm, all-zeros, complex, and float32/64 + complex64/128.AI disclosure: the patch was written with an LLM; I reviewed and pushed it myself.