code: def generator(self, data_dir, tmp_dir, is_training):
      del data_dir, tmp_dir, is_training
      for i in range(30):
          yield {
              "inputs": [i] * (i + 1),
              "targets": [i],
              "floats": [i + 0.5],
          }
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import tempfile
  import numpy
  from six.moves import range
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import data_reader
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 1 for calling the TestProblem obj's underlying member method code with example usage: obj.generator(data_dir, tmp_dir, is_training) without return types