class_docstr: Implements lit.Model interface for testing.
  
  This class allows user-specified outputs for testing return values.
class_docstr_tok: ["Implements","lit.Model","interface","for","testing",".","This","class","allows","user-specified","outputs","for","testing","return","values","."]
code: def output_spec(self):
      return self._output_spec
  
imports: from collections.abc import Iterable, Iterator
  from lit_nlp.api import model
  from lit_nlp.api import types
  import numpy
  import numpy.testing
label_desc: Use image node_id 3 for calling the CustomOutputModelForTesting obj's underlying member method code with example usage: obj.output_spec() and returns: self