How to Implement a Cosine Similarity Function in TypeScript

https://alexop.dev/posts/how-to-implement-a-cosine-similarity-function-in-typescript-for-vector-comparison/

#HackerNews #CosineSimilarity #TypeScript #Programming #VectorComparison #CodingTutorial

I’m excited to share my newest blog post, "Don't sure cosine similarity carelessly"

https://p.migdal.pl/blog/2025/01/dont-use-cosine-similarity

We often rely on cosine similarity to compare embeddings—it's like “duct tape” for vector comparisons. But just like duct tape, it can quietly mask deeper problems. Sometimes, embeddings pick up a “wrong kind” of similarity, matching questions to questions instead of questions to answers or getting thrown off by formatting quirks and typos rather than the text's real meaning.

In my post, I discuss what can go wrong with off-the-shelf cosine similarity and share practical alternatives. If you’ve ever wondered why your retrieval system returns oddly matched items or how to refine your embeddings for more meaningful results, this is for you!
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I want to thank Max Salamonowicz and Grzegorz Kossakowski for their feedback after my flash talk at the Warsaw AI Breakfast, Rafał Małanij for inviting me to give a talk at the Python Summit, and for all the curious questions at the conference, and LinkedIn.

#cosineSimilarity #embedding #llm #similarity

For folks who work in #DataScience, what's the easiest way for me to to calculate the #CosineSimilarity of two strings? I'm looking at sklearn cosine_similarity first.

Related to hallucination detection in #ASR - low cosine similarity indicative of hallucination.