code: def _step_func(self, func, t0, dt, t1, y0):
      pass
  
imports: import abc
  import torch
  from .event_handling import find_event
  from .misc import _handle_unused_kwargs
label_desc: Use image node_id 4 for calling the FixedGridODESolver obj's underlying member method code with example usage: obj._step_func(func, t0, dt, t1, y0) without return types