class_docstr: Portal input for monkey-patching of mask in predict mode.
code: def __init__(self, portal_input):
      super().__init__(name="_PortalOutput", n_out=1, n_in=0)
      self._portal_input = portal_input
  
imports: import functools
  from trax import layers
  from trax.fastmath import numpy
  from trax.models.reformer import reformer
  from trax.models.research import configurable_transformer
  from trax.models.research import transformer2
label_desc: Use image node_id 1 to create a new _PortalOutput object from inherited base classes: tl with example: obj = _PortalOutput(portal_input)