class_docstr: Based on OpenAI Gym version
  (https://github.com/openai/gym/blob/master/gym/envs/classic_control/cartpole.py)
code: def is_vectorizable(self):
      return True
  
file_path: tensorforce/tensorforce/environments/cartpole.py
imports: import numpy
  from tensorforce.environments import Environment
label_desc: Use image node_id 4 for calling the CartPole obj's underlying member method code with example usage: obj.is_vectorizable() and returns: True