class_docstr: DQN's head (Nature version)
class_docstr_tok: ["DQN","'s","head","(","Nature","version",")"]
code: def __call__(self, state):
      h = state
      for layer in self:
          h = self.activation(layer(h))
      return h
  
file_path: chainerrl/chainerrl/links/dqn_head.py
imports: import chainer
  from chainer import functions
  from chainer import links
label_desc: Use image node_id 2 for calling the NatureDQNHead obj's underlying member method code with example usage: obj.__call__(state) and returns: h