class_docstr: Evaluates candidate ensemble performance.
docstr: Return the input_fn.
docstr_tok: ["Return","the","input_fn","."]
code: def input_fn(self):
      """Return the input_fn."""
      return self._input_fn
  
file_path: adanet/adanet/core/evaluator.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import math
  from absl import logging
  from adanet import tf_compat
  import numpy
  import tensorflow.compat.v2
label_desc: Use image node_id 2 for calling the Evaluator obj's underlying member method code with example usage: obj.input_fn() and returns: self