// Construct the value array of transposed filter. Assumes 2D matrix.
  SmallVector<int8_t> new_filter_values(filter_values.size(), /*Value=*/0);
  for (int i = 0; i < filter_shape[0]; ++i) {
    for (int j = 0; j < filter_shape[1]; ++j) {
      const int old_idx = i * filter_shape[1] + j;
      const int new_idx = j * filter_shape[0] + i;
      new_filter_values[new_idx] = filter_values[old_idx];
    }
  }