code: def _reflect_index_fixer(index, size):
      return torch.floor_divide(
          _mirror_index_fixer(2 * index + 1, 2 * size + 1) - 1, 2
      )
  
file_path: keras/keras/backend/torch/image.py
imports: import functools
  import itertools
  import operator
  import torch
  from keras.backend.torch.core import convert_to_tensor
label_desc: Use image node_id 4 for calling a global function with example usage: _reflect_index_fixer(index, size) and returns: torch