Documentation, tutorials or examples for similarity and classification

[bthj]

Hi - on the feature list on the front page of https://essentia.upf.edu/ there are two that I find particularly interesting:

• Similarity: Analyze audio and compute features to find similar sounds or music tracks.
• Classification: Classify sounds or music based on computed audio features.

Where could I find documentation, tutorials or examples of how to perform those tasks with Essentia(.js) ?