Does lhotse support multiple features?

[muradbozik]

I read the documentation and the codebase. I think a cut can only have one features. I was looking for something like this:

cuts = load_manifest_lazy("path/to/manifest")
cut = cuts[0]

mfcc_features = cut.load_features(type="mfcc")
fbank_features = cut.load_features(type="kaldi-fbank")

cut.features can only hold information about one feature.

Is there a way to work with multiple features?

[muradbozik]

If this is not possible, I would like to work on a PR about this. Does this also make sense for many use cases?

[pzelasko]

It's possible, but poorly documented as of yet. You want to check the FeaturesWriter.store_array used like this:

with NumpyFilesWriter(path) as w:  # works with other writers too
    cut.my_custom_features = w.store_array(key, array, ...)

[muradbozik]

Thanks. By following @pzelasko 's suggestion I managed to save custom features with hd5 writer. I end up writing GenericFeatures class to easily load and manipulate those features later on.