Hey, sorry about that, the library has been in flux and that appears to be an older notebook. The fastai V2 version is under development, and the mostly stable (inference currently version) here is the version that is compatible w fastai V1.
Since you’re new to audio, definitely check out the following notebooks
- 00_Getting_Started.ipynb
- 01_Intro_to_Audio.ipynb
- 02_Features.ipynb