Similarity search based on dot product

[fullflu]

Hi @matsui528 ,
Thank you for releasing such an awesome library.

Now I want to implement a subset search system based on dot product.
Do you have any plans to develop such algorithms?

I found that annoy implements similarity search algorithms using dot product, but it did not focus on the subset search.
https://github.com/spotify/annoy/blob/84f1c68e43b41daf1ce22c1eb4f3a8d3e0086403/src/annoylib.h#L505

[matsui528]

I didn't plan to implement a dot-product functionality, but it may be useful for some cases. Let me check my code, and I'll implement it if it turns out that it's easy to code...

[fullflu]

Thank you for your response.
I understand your plan. I'll use other methods for a while, but I’m looking forward to your implementation of the dot product similarity (if possible).

[matsui528]

It turned out that it's not trivial to implement the IP search functionality 😰 Waiting for PR, though!