If cuts aren't mutable how does one change the text of a cut?

[RuABraun]

Hi,

I have a cut and want to modify its text. Assigning cut.supervisions[0].text='bla' does not work as expected, since it's not mutable. I don't see an explanation for what to do if one needs to modify cuts/cutsets though, what can I do?

[desh2608]

I think the following should work:

from lhotse.utils import fastcopy

new_cut = fastcopy(cut, supervisions=[fastcopy(cut.supervisions[0], text="bla")])

Also check out: CutSet.map_supervisions(), CutSet.transform_text().

[RuABraun]

thank you! :)

for larger changes I guess it's unavoidable to loop over and create new SupervisionSet and RecordingSets ?

[desh2608]

yeah, might be best to create a new supervision manifest with the next text. BTW, Cut supports custom fields, so you can add a new text to an existing cut under a new field name.