Missing cosine?

[jcoc611]

Hi there! This is great.

Seems that cosine metric is missing. Based on the python bindings it should be as easy as saving a normalize flag somewhere in HierarchicalNSW of addon.cc and using IP + normalizing all the vectors if true.

[yoshoku]

@jcoc611 Thank you for having interest in this npm. hnsw-node currently does not support cosine metric. Python bindings normalize vector when before calling the addPoint member function if the normalize flag is true. It is not difficult to do the same in the hnsw-node. I would like to to try to implement the cosine metric option.

[nfcampos]

This would be a great addition. We're using this library in https://github.com/hwchase17/langchainjs (thank you!) and would love to offer cosine metric

[yoshoku]

@nfcampos Thank you for using this npm for your great product 👍 The cosine metric option has been implemented and tested, I will release that shortly.

[yoshoku]

@jcoc611 @nfcampos I have released v1.4.2 which includes the cosine metric option. I enjoyed implementing it. Thank you for your suggestion.

[nfcampos]

@yoshoku Great, thanks!