code: def test_keras_single_gpu():
      mnist.run_keras_single_device("gpu", 0)
  
file_path: DALI/dali/test/python/test_dali_tf_dataset_mnist_eager.py
imports: import tensorflow
  from nose.tools import with_setup
  import test_dali_tf_dataset_mnist
  from test_utils_tensorflow import skip_for_incompatible_tf, available_gpus
  from nose_utils import raises
  from nose import SkipTest
  from distutils.version import LooseVersion
label_desc: Use image node_id 1 for calling a global function with example usage: test_keras_single_gpu() without return types