// computations, compared to the `xla::AvgPoolGrad` implementation, by
      // subtracting the original exterior padding before `ReduceWindowOp`
      // instead of trimming the result of `ReduceWindowOp` (the final result is
      // the same because all strides are 1).
      low_padding[dim] =
          conv_grad_spatial_dim.pad_before - orig_padding[dim].first;