Numba: fuse AdvancedSubtensor->Elemwise->AdvancedIncSubtensor#2015

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ricardoV94 wants to merge 7 commits intopymc-devs:v3from

ricardoV94:gather_scatter_fusion

Commits on Apr 5, 2026

Warn when copy(delete_updates=True) leaves inplace-destroyed shared variables
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Elemwise: fuse sibling subgraphs in FusionOptimizer
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Numba: fuse AdvancedSubtensor1 indexed reads into Elemwise
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Numba: fuse AdvancedIncSubtensor1 indexed updates into Elemwise
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Numba: generalize IndexedElemwise to arbitrary-axis and multi-index
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Numba: fuse ND and 0-d integer indices into IndexedElemwise
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Numba: allow broadcast scatter in IndexedElemwise
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