code: def __getitem__(self, ind):
      I = slice(None)
      return self.data[(I, I) + ind]
  
file_path: pytorch-struct/torch_struct/helpers.py
imports: import torch
  import math
  from .semirings import LogSemiring
label_desc: Use image node_id 2 for calling the Chart obj's underlying member method code with example usage: obj.__getitem__(ind) and returns: self