apeforest commented on issue #16735: Use single-bit for mask in dropout operator URL: https://github.com/apache/incubator-mxnet/pull/16735#issuecomment-586519348 > Does the slow down come from more computation in the new algorithm or the sub-optimal implementation? @PatricZhao The slowdown comes from extra computation in the new algorithm when dropout uses MKL. MKL already does the masking but stores each mask as integer. The new algorithm simply repackage this int32 based mask into bit-based mask and therefore introduced extra runtime. In the ideal case, it would be to enhance MKL dropout to store mask using bits. But it requires modification of the VSL APIs.
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