code: def init_hidden(self):
      hidden_state = paddle.zeros(
          (1, self.rnn_hidden_dim), dtype="float32"
      )
      return hidden_state
  
file_path: PARL/examples/QMIX/rnn_model.py
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  import parl
label_desc: Use image node_id 2 for calling the RNNModel obj's underlying member method code with example usage: obj.init_hidden() and returns: hidden_state