[example] Don't always normalize the embeddings in clustering example

[tomaarsen]

Closes #2519

Hello!

Pull Request overview

• Don't always normalize the embeddings in clustering example

Details

This change no longer automatically normalizes the embeddings, but does still show that it might be beneficial if the model doesn't already automatically do it.

• Tom Aarsen

[archit15singh]

Thanks @tomaarsen for the clarity