code: def partial_fit(self, *args, **kwargs):
      self._num_calls += 1
      return self
  
imports: import os
  from ast import literal_eval
  import numpy
  from distributed import Lock, Variable, get_worker
  from sklearn.base import BaseEstimator, ClassifierMixin
  from sklearn.utils.validation import _num_samples, check_array
label_desc: Use image node_id 3 for calling the LinearFunction obj's underlying member method code with example usage: obj.partial_fit() and returns: self