improve F.rsqrt performance in CPU #4538
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kmaehashi
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cat:enhancement
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LGTM! |
kmaehashi
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Apr 17, 2018
improve F.rsqrt performance in CPU
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F.rsqrtoptimization for GPU (#4108) made significant performance regression (about 20 times slower) in backward computation when CPU is used.I separated the code between CPU and GPU to fix this issue.
CPU performance before applying this PR:
CPU performance after applying this PR:
Benchmark code: https://github.com/kmaehashi/chainer-benchmark/blob/master/benchmarks/functions/math/sqrt.py#L20
Data: float32 shape=(1000, 1000)