class_docstr: A2C model.
class_docstr_tok: ["A2C","model","."]
docstr: Evaluate the policy and the V-function.
  
  Args:
      obs (Variable or ndarray): Batched observations.
  Returns:
      Distribution and Variable
docstr_tok: ["Evaluate","the","policy","and","the","V-function",".","Args",":","obs","(","Variable","or","ndarray",")",":","Batched","observations",".","Returns",":","Distribution","and","Variable"]
code: def pi_and_v(self, obs):
      """Evaluate the policy and the V-function.
  
      Args:
          obs (Variable or ndarray): Batched observations.
      Returns:
          Distribution and Variable
      """
      raise NotImplementedError()
  
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 1 for calling the A2CModel obj's underlying member method code with example usage: obj.pi_and_v(obs) without return types