1bit: not need to do wd mom for uncompressed gradients #61
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Since I have set a threshold, not all gradients are compressed by 1bit. For those uncompressed gradients, which are typically small tensors, there is no need to do wd mom for them. Instead, just normal weight decay is enough.
It is a waste of GPUs to do wd mom for all and may bring unknow results. e.g. hurting accuracy? Results show there is a significant performance gain.