apeforest commented on a change in pull request #16903: changing data type of 
't' to int in lamb_update_phase1
URL: https://github.com/apache/incubator-mxnet/pull/16903#discussion_r350480484
 
 

 ##########
 File path: src/operator/optimizer_op-inl.h
 ##########
 @@ -1639,8 +1639,8 @@ struct LambUpdatePhaseOneKernel {
     DType g = mean_data[i] / (square_root::Map(var_data[i]) + epsilon) + wd * 
weight_data[i];
 
     if (bias_correction) {
-      DType mean_hat = mean_data[i] / (1. - power::Map(beta1, t));
-      DType var_hat = var_data[i] / (1 - power::Map(beta2, t));
+      DType mean_hat = mean_data[i] / (1. - std::pow(beta1, t));
 
 Review comment:
   Can we still re-use the power::Map() data structure here with a new 
signature for Map()? 

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