htk=true for mel frequencies

[justinsalamon]

We noticed the current implenetation of the mel_frequencies function (based on Librosa) doesn't include the htk=True option, which is handy when training CNNs because then the frequency scale is fully logarithmic which, in principle, makes more sense for frequency invariant convolutional filters.

What was the motivation for removing this? Any chance it can be added?

[keunwoochoi]

There's only one reason; to make it simpler as an initial step. PR would be welcomed :)

[keunwoochoi]

It will be added -- actually I'll directly use librosa's mel_frequencies function instead of relying on copied codes.

[justinsalamon]

Has this been added? Can't see it in the code?

[keunwoochoi]

Oh, not yet on the master, it's on dev branch only. https://github.com/keunwoochoi/kapre/blob/unittest/kapre/backend.py, sorry to confuse you!

[justinsalamon]

Yeah in which case you might want to keep the issue open until the update is merged into master.

Or - you can close issues via commit messages, e.g. "this commit closes #27" - this way when the issue is closed there's a documented link to the fix

[keunwoochoi]

via commit messages

Oh, didn't know that, interesting!

[justinsalamon]

More info: https://help.github.com/articles/closing-issues-using-keywords/
Example of what this looks like from my scaper repo: justinsalamon/scaper#23

[keunwoochoi]

Finally, with ver>=0.1.3.