code: def reset_state(self):
      self.h = None
  
imports: import numpy
  import chainer
  from chainer.functions.activation import sigmoid
  from chainer.functions.activation import tanh
  from chainer.functions.array import concat
  from chainer.functions.math import linear_interpolate
  from chainer import link
  from chainer.links.connection import linear
label_desc: Use image node_id 4 for calling the StatefulMGU obj's underlying member method code with example usage: obj.reset_state() without return types