class_docstr: Roll axis of an array.
class_docstr_tok: ["Roll","axis","of","an","array","."]
code: def forward(self, inputs):
      self.retain_inputs(())
      self._in_ndim = inputs[0].ndim
      xp = backend.get_array_module(*inputs)
      return (xp.rollaxis(inputs[0], self.axis, self.start),)
  
file_path: chainer/chainer/functions/array/rollaxis.py
imports: import six
  from chainer import backend
  from chainer import function_node
  from chainer.utils import type_check
label_desc: Use image node_id 3 for calling the Rollaxis obj's underlying member method code with example usage: obj.forward(inputs) and returns: xp