class_docstr: A transformation from an input 3D space to an output 3D space defined
  by an affine matrix.
  
  It is defined by the affine matrix , and the name of the input and output
  spaces.
code: def __repr__(self):
      representation = "{}(\n  affine={},\n  input_space={},\n  output_space={})".format(
          self.__class__.__name__,
          "\n         ".join(repr(self.affine).split("\n")),
          self.input_space,
          self.output_space,
      )
      return representation
  
file_path: nipy/nipy/labs/datasets/transforms/affine_transform.py
imports: import numpy
  from .affine_utils import apply_affine
  from .transform import Transform
label_desc: Use image node_id 6 for calling the AffineTransform obj's underlying member method code with example usage: obj.__repr__() and returns: representation