class_docstr: Elementwise inverse hyperbolic tangent function.
code: def check_type_forward(self, in_types):
      type_check._argname(in_types, ("x",))
      (x_type,) = in_types
  
      type_check.expect(x_type.dtype.kind == "f")
  
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 the Arctanh obj's underlying member method code with example usage: obj.check_type_forward(in_types) without return types