code: def squared_difference(x1, x2):
      """Squared difference function.
  
      This functions is identical to :func:`~chainer.functions.squared_error`
      except for the names of the arguments.
  
      .. seealso:: :func:`~chainer.functions.squared_error`
  
      """
      return squared_error(x1, x2)
  
file_path: chainer/chainer/functions/loss/squared_error.py
imports: from chainer import function_node
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 2 for calling a global function with example usage: squared_difference(x1, x2) and returns: squared_error