code: def check_lengths(self):
      return (
          (len(self.ftime) == len(self))
          and (len(self.btime) == len(self) + 1)
          and (len(self.x) == len(self) + 1)
          and (len(self.ftmp) == len(self))
          and (len(self.btmp) == len(self) + 1)
          and (len(self.xbar) == len(self) + 1)
      )
  
imports: import math
  from abc import ABC
  from typing import List
  from torch.utils._pytree import tree_map
label_desc: Use image node_id 2 for calling the Chain obj's underlying member method code with example usage: obj.check_lengths() and returns: unknown