def transform_annotation(self, ann, duration):
'''Apply the structure agreement transformation.
Parameters
----------
ann : jams.Annotation
The segment annotation
duration : number > 0
The target duration
Returns
-------
data : dict
data['agree'] : np.ndarray, shape=(n, n), dtype=bool
'''
intervals, values = ann.to_interval_values()
intervals, values = adjust_intervals(intervals,
values,
t_min=0,
t_max=duration)
# Re-index the labels
ids, _ = index_labels(values)
rate = float(self.hop_length) / self.sr
# Sample segment labels on our frame grid
_, labels = intervals_to_samples(intervals, ids, sample_size=rate)
# Make the agreement matrix
return {'agree': np.equal.outer(labels, labels)}
