def truncate_dataset(dataset, truncation_point):
    """
    Abstraction of numpy slicing operation for 2D array truncation.
    :param dataset: 2D np.array
    :param truncation_point: int of truncation index to test
    :return: np.array
    """
    assert (len(dataset.shape) == 2)  # Assert data_column is a 2D numpy array
    return dataset[-1 * truncation_point:]