code: def forward(self, x):
      if self.h is None:
          n_batch = x.shape[0]
          dtype = chainer.get_dtype()
          h_data = self.xp.zeros(
              (n_batch, self._state_size), dtype=dtype
          )
          h = chainer.Variable(h_data)
      else:
          h = self.h
  
      self.h = self._call_mgu(h, x)
      return self.h
  
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 5 for calling the StatefulMGU obj's underlying member method code with example usage: obj.forward(x) and returns: self