code: def _call_mgu(self, h, x):
      f = sigmoid.sigmoid(self.W_f(concat.concat([h, x])))
      h_bar = tanh.tanh(self.W_h(concat.concat([f * h, x])))
      h_new = linear_interpolate.linear_interpolate(f, h_bar, h)
      return h_new
  
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 2 for calling the MGUBase obj's underlying member method code with example usage: obj._call_mgu(h, x) and returns: h_new