code: def predict_output_schema(self):
      self._check_output_schema()
      return self._predict_output_schema or self._output_schema
  
imports: import logging
  from collections import namedtuple
  import numpy
  from caffe2.proto import caffe2_pb2
  from caffe2.python import core, schema, scope, utils, workspace
  from caffe2.python.layers.tags import TagContext
label_desc: Use image node_id 6 for calling the ModelLayer obj's underlying member method code with example usage: obj.predict_output_schema() and returns: unknown