class_docstr: Abstract class for implementing invertible transformation
  with computable log  det jacobians
  
  Attributes
  ----------
  bijective : bool
class_docstr_tok: ["Abstract","class","for","implementing","invertible","transformation","with","computable","log","det","jacobians","Attributes","--","--","--","--","--","bijective",":","bool"]
docstr: Returns the sign of the determinant of the Jacobian.
docstr_tok: ["Returns","the","sign","of","the","determinant","of","the","Jacobian","."]
code: def sign(self):
      """
      Returns the sign of the determinant of the Jacobian.
      """
      raise NotImplementedError
  
imports: import weakref
  from ..distributions.utils import _clip_prob, cached_property, sum_right_most
  from ...block import HybridBlock
  from ....None import np, npx
label_desc: Use image node_id 2 for calling the Transformation obj's underlying member method code with example usage: obj.sign() without return types