Merge pull request #16852 from sneaxiy/fix_merge_lod_tensor_op_infer_shape

Fix merge_lod_tensor_op infer shape

paddle/fluid/operators/merge_lod_tensor_op.cc

@@ -164,7 +164,9 @@ class MergeLoDTensorInferShape : public framework::InferShapeBase {
 
     auto mask_dim = context->GetInputDim("Mask");
     PADDLE_ENFORCE_EQ(mask_dim.size(), 2);
+    if (context->IsRuntime() || mask_dim[1] > 0) {
       PADDLE_ENFORCE_EQ(mask_dim[1], 1);
+    }
 
     context->SetOutputDim("Out", context->GetInputDim("InTrue"));
   }