How to use the spleeter.utils.tensor.sync_apply function in spleeter

def random_pitch_shift(self, sample):
        """ Randomly pitch shift the given sample. """
        return dict(sample, **sync_apply({
            f'{instrument}_spectrogram':
                sample[f'{instrument}_spectrogram']
            for instrument in self._instruments},
            lambda x: random_pitch_shift(
                x, shift_min=-1.0, shift_max=1.0), concat_axis=0))

def random_time_crop(self, sample):
        """ Random time crop of 11.88s. """
        return dict(sample, **sync_apply({
            f'{instrument}_spectrogram': sample[f'{instrument}_spectrogram']
            for instrument in self._instruments},
            lambda x: tf.image.random_crop(
                x, (self._T, len(self._instruments) * self._F, 2),
                seed=self._random_seed)))

def random_time_stretch(self, sample):
        """ Randomly time stretch the given sample. """
        return dict(sample, **sync_apply({
            f'{instrument}_spectrogram':
                sample[f'{instrument}_spectrogram']
            for instrument in self._instruments},
            lambda x: random_time_stretch(
                x, factor_min=0.9, factor_max=1.1)))