code: def __call__(self, *args):
      return 0, np.zeros(self.i)
  
file_path: emcee/src/emcee/tests/unit/test_blobs.py
imports: import warnings
  import numpy
  import pytest
  from emcee import EnsembleSampler, backends
label_desc: Use image node_id 2 for calling the VariableLogProb obj's underlying member method code with example usage: obj.__call__() and returns: int,  np