code: def arctanh(x):
      """Elementwise inverse hyperbolic tangent function.
  
      Args:
          x (:class:`~chainer.Variable` or :ref:`ndarray`): Input variable.
  
      Returns:
          ~chainer.Variable: Output variable.
  
      """
      return Arctanh().apply((x,))[0]
  
file_path: chainer/chainer/functions/math/arctanh.py
imports: from chainer import backend
  from chainer import function_node
  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: arctanh(x) and returns: Arctanh