code: def _chart(self, size, potentials, force_grad):
      return self._make_chart(1, size, potentials, force_grad)[0]
  
file_path: pytorch-struct/torch_struct/helpers.py
imports: import torch
  import math
  from .semirings import LogSemiring
label_desc: Use image node_id 5 for calling the _Struct obj's underlying member method code with example usage: obj._chart(size, potentials, force_grad) and returns: self