class_docstr: A2C model.
class_docstr_tok: ["A2C","model","."]
code: def __call__(self, obs):
      return self.pi_and_v(obs)
  
imports: from logging import getLogger
  import warnings
  import chainer
  from chainer import functions
  from chainerrl import agent
  from chainerrl.misc.batch_states import batch_states
  from chainerrl.recurrent import RecurrentChainMixin
label_desc: Use image node_id 2 for calling the A2CModel obj's underlying member method code with example usage: obj.__call__(obs) and returns: self