resize before computing LoD.

Author: pkuyym

paddle/operators/sequence_reshape_op.h

@@ -46,8 +46,8 @@ class SequenceReshapeKernel : public framework::OpKernel<T> {
     } else {
       auto& out_lod = *out->mutable_lod();
       out_lod.resize(1);
-      out_lod[0].clear();
-      out_lod[0].push_back(0);
+      out_lod[0].resize(seq_num + 1);
+      out_lod[0][0] = 0;
       for (int i = 0; i < seq_num; ++i) {
         size_t seq_len = in_lod_l0[i + 1] - in_lod_l0[i];
         size_t offset = 0;
@@ -57,11 +57,10 @@ class SequenceReshapeKernel : public framework::OpKernel<T> {
                           "be divided by new_dim with no remainder for each "
                           "sequence. The %dth sequence is invalid.",
                           i + 1);
-        out_lod[0].push_back(out_lod[0].back() + offset);
+        out_lod[0][i + 1] = out_lod[0][i] + offset;
       }
     }
 
-    out->mutable_data<T>(context.GetPlace());
     framework::Copy(*in, context.GetPlace(), out);
     out->Resize({static_cast<int64_t>(out->lod()[0].back()), out_width});
   }