import tensorflow as tf

        fields.InputDataFields.groundtruth_keypoint_visibilities:
            tf.constant([True, False, True]),
        fields.InputDataFields.groundtruth_instance_masks:
            tf.constant(np.random.rand(3, 4, 4).astype(np.float32)),
        fields.InputDataFields.groundtruth_is_crowd:
            tf.constant([False, True, False]),
        fields.InputDataFields.groundtruth_difficult:
            tf.constant(np.array([0, 0, 1], np.int32))
    }

