def _persist_numpy(self, arr, name):
    filename = os.path.join(self._intermediate_directory, ('NumpyNullPreprocessor' + name))
    with open(filename, 'w') as f:
        np.save(f, arr)
    return filename
def _persist_numpy(self, arr, name):
    filename = os.path.join(self._intermediate_directory, ('NumpyNullPreprocessor' + name))
    with open(filename, 'w') as f:
        np.save(f, arr)
    return filename