code: def set_task_index(self, index):
      self.task = index
  
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 4 for calling the ToxcastLearner obj's underlying member method code with example usage: obj.set_task_index(index) without return types