Merge pull request #5104 from helinwang/momentum

Fix pserver SGD with momemtum checkpoint recover.

paddle/optimizer/sgd_optimizer.cc

@@ -44,7 +44,7 @@ void SGDOptimizer::DeserializeState(const std::string &str) {
   this->lr_policy_->DeserializeState(lr_state.SerializeAsString());
   num_sample_passed_ = state.num_sample_passed();
   ProtoToTensor(state.parameter(), parameter_);
-  if (momentum_ != 0.0) ProtoToTensor(state.parameter(), momentums_);
+  if (momentum_ != 0.0) ProtoToTensor(state.momentums(), momentums_);
 }
 
 }  // namespace optimizer