class_docstr: Portal input for monkey-patching of mask in predict mode.
code: def get_value(self):
      return self._portal_input.get_value()
  
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 3 for calling the _PortalOutput obj's underlying member method code with example usage: obj.get_value() and returns: self