thomelane commented on issue #12392: How to use BlockGrad with weight decay URL: https://github.com/apache/incubator-mxnet/issues/12392#issuecomment-426479639 Answering your question a little more directly (if you haven't moved over to Gluon), you could set the weight decay to zero for the parameters before the BlockGrad with [`set_wd_mult`](https://github.com/apache/incubator-mxnet/blob/master/python/mxnet/optimizer.py#L330).
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