code: def _inplace_axpby(x, a, b, y):
      # in-place axpby: x = a * x + b * y
      if isinstance(x, intel64.mdarray):
          x.inplace_axpby(a, b, y)
      else:
          if a == 1:
              x += b * y
          else:
              x[...] = a * x + b * y
  
imports: from __future__ import division
  import math
  import warnings
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer.backends import intel64
  from chainer import optimizer
  from chainer import types
label_desc: Use image node_id 3 for calling a global function with example usage: _inplace_axpby(x, a, b, y) without return types