message: Fix wgrad init issue
diff: @@ -210,8 +210,6 @@ void MultiplyLayer::bprop(cudaStream_t stream) {
  float* input = in_tensors_[0]->get_ptr();
  float* output = out_tensors_[0]->get_ptr();
  - cudaMemsetAsync(wgrad, 0, wgrad_[0]->get_size(), stream);
  -
  multiply_wgrad(output, input, wgrad, wgrad_tmp_trans, batch_size_, slot_num_, embedding_vec_size_,
  stream);
  