inline size_t ReducedOutputOffset(const int num_dims, const int* dims,
                                  const int* index, const int num_axis,
                                  const int* axis) {
  if (num_dims == 0) {
    return 0;
  }
  TFLITE_DCHECK(dims != nullptr);
  TFLITE_DCHECK(index != nullptr);
  size_t offset = 0;
  for (int idx = 0; idx < num_dims; ++idx) {
    // if we need to skip this axis
    bool is_axis = false;
    if (axis != nullptr) {
      for (int axis_idx = 0; axis_idx < num_axis; ++axis_idx) {
        if (idx == axis[axis_idx]) {
          is_axis = true;
          break;
        }
      }
    }
    if (!is_axis) {
      offset = offset * static_cast<size_t>(dims[idx]) +
               static_cast<size_t>(index[idx]);
    }
  }
  return offset;
}