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Rewrite suitable Scans as Elemwise ScalarLoops #301

@ricardoV94

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@ricardoV94
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Scans that are composed exclusively of Elemwise Operations and where only the last state is needed could be rewritten as ScalarLoops, which are potentially faster, specially in the C backend.

Taps would have to be rolled manually as separate inputs and outputs.

See #283

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          Rewrite suitable Scans as Elemwise ScalarLoops · Issue #301 · pymc-devs/pytensor