code: def astep(self, *args, **kwargs):
      raise NotImplementedError()
  
imports: import logging
  import arviz
  import numpy
  import pytest
  import pymc
  from pymc.backends import init_traces
  from pymc.step_methods.arraystep import ArrayStepShared
  from pymc.backends.mcbackend import ChainRecordAdapter, find_data, get_variables_and_point_fn, make_runmeta_and_point_fn
label_desc: Use image node_id 1 for calling the ToyStepper obj's underlying member method code with example usage: obj.astep() without return types