Merge pull request #16261 from phlrain/fix_sequence_pad_2

Fix sequence pad 2

Author: phlrain

paddle/fluid/operators/math/sequence_padding.cu

@@ -78,12 +78,6 @@ class PaddingLoDTensorFunctor<platform::CUDADeviceContext, T> {
                    "The numel of 'pad_value' can only be 1 or be equal to the "
                    "'step_width'.");
 
-    if (!norm_by_times && seq_num == 1UL && pad_seq_len == max_seq_len) {
-      TensorCopy(seq_tensor, context.GetPlace(), context, pad_tensor);
-      pad_tensor->Resize(pad_tensor_dims);
-      return;
-    }
-
     const int kBlockSize = 512;
 
     /* At least use 32 threads to copy sequence_width elements,
@@ -129,12 +123,13 @@ class UnpaddingLoDTensorFunctor<platform::CUDADeviceContext, T> {
 
     CheckDims(seq_tensor_dims, pad_tensor_dims, seq_offsets, pad_seq_len,
               step_width, layout);
-
+    /*
     if (!norm_by_times && seq_num == 1UL && pad_seq_len == max_seq_len) {
       TensorCopy(pad_tensor, context.GetPlace(), context, seq_tensor);
       seq_tensor->Resize(seq_tensor_dims);
       return;
     }
+    */
 
     const int kBlockSize = 512;