cjolivier01 commented on issue #8219: Broadcasting ops are slow URL: https://github.com/apache/incubator-mxnet/issues/8219#issuecomment-349509771 broadcast_add has more overhead than a simple elemwise_add, so I would expect it to be a bit slower. I believe the current implementation of "+" uses elemwise_add if a and b shapes are the same (a + b portion), and broadcast_add() if they differ.
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