code: def _mean(x, axis, keepdims=False):
      (y,) = Mean(axis, keepdims).apply((x,))
      return y
  
file_path: chainer/chainer/functions/math/average.py
imports: import six
  import chainer
  from chainer import function_node
  from chainer.functions.array import broadcast
  from chainer.functions.array import reshape
  from chainer.functions.math import sum
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 1 for calling a global function with example usage: _mean(x, axis, keepdims) and returns: y