Returns an iterable of tf.Examples.
    Args:
        data_extracts: An iterable of (position, pi, result) tuples

def make_dataset_from_selfplay(data_extracts):
    """
    Returns an iterable of tf.Examples.
    Args:
        data_extracts: An iterable of (position, pi, result) tuples
    """
    tf_examples = (make_tf_example(features_lib.extract_features(pos), pi, result)
                   for pos, pi, result in data_extracts)
    return tf_examples