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Merge pull request #27017 from WarrenWeckesser/gh-26908-rel-note
DOC: Release note for feature added in gh-26908.
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‎doc/release/upcoming_changes/26908.c_api.rst‎

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New ``PyUFuncObject`` field ``process_core_dims_func``
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The field ``process_core_dims_func`` was added to the structure
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``PyUFuncObject``. For generalized ufuncs, this field can be set to a
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function of type ``PyUFunc_ProcessCoreDimsFunc`` that will be called when the
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ufunc is called. It allows the ufunc author to check that core dimensions
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satisfy additional constraints, and to set output core dimension sizes if they
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have not been provided.

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