code: def variables(self):
      return [self.w1, self.w2, self.b1, self.b2]
  
file_path: deepchem/examples/low_data/toxcast_maml.py
imports: from __future__ import print_function
  import deepchem
  import numpy
  import tensorflow
  from sklearn.metrics import accuracy_score
label_desc: Use image node_id 3 for calling the ToxcastLearner obj's underlying member method code with example usage: obj.variables() and returns: list