huifengguo commented on issue #17728: Poor performance when we use mx.symbol.Variable(..,..,stype="row-sparse") to define the variable URL: https://github.com/apache/incubator-mxnet/issues/17728#issuecomment-596891494 > Yes, there's no free food. You can still "use Adam and row_sparse variable" with `lazy_update=False` to get identical update, the only benefit you get is less that data is transmitted during communication OK, we just notice another parameter of kvstore in mx.init_optimizer(). No matter we set Lazy update as True or False, when we set mod.init_optimizer as following and variable as row_sparse, the auc is only 0.794 while the auc is 0.804+ in other cases. ``` mx.mod.Module(....) store = kv.create('local_allreduce_device') optim = mx.optimizer.create(optimizer, learning_rate=lr,wd=1.0E-9, rescale_grad=1.0/batch_size,epsilon=5e-8, lazy_update=False) mod.init_optimizer(kvstore=store, optimizer=optim) ```
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