Tinybrain

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* build: more update for py312
* build: update for py312

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* release(1.4.0): full support for 2x2x1 avg pooling
* perf: 2x2x1 sparse avg pooling (20)
* feat: numpy implementation of sparse for averaging

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* release(1.3.3): fix sparse mode 2x2x2 seg ds and throw error
* fix: throw error if sparse mode isn't supported
* refactor: remove unused variable oyoff
* fix: incorrect sparse check value in 2x2x2 mode downsampling

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* release(1.3.2): updates build system for py311
* build: update for python311

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* release(1.3.1): fixes downsampling factors > 2
* ci: remove appveyor
* ci: remove travis
* ci: add GHA tests
* fix: supporting floats in is\_pot (19)

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* release(1.3.0): performance improvements for mode pooling
* install: bump requirement to py37
* perf: faster 2x2 mode pooling (18)
* perf: enabled forgotten accelerated 2x2x2 sparse mode