// the same because all strides are 1).
      low_padding[dim] =
          conv_grad_spatial_dim.pad_before - orig_padding[dim].first;
      high_padding[dim] =
          conv_grad_spatial_dim.pad_after - orig_padding[dim].second;

      // Update `out_grad_shape` to result shape of following `PadOp`.
      out_grad_shape[dim] = low_padding[dim] + high_padding[dim] +