That sounds like a reference to the concept of cosine similarity.
Imagine that words are spread out in the space.
Cosine similarity is a measure of similarity between two vectors (each word is encoded as a vector).
By measuring the cosine of the angle between the two vectors we can get:
1) whether 2 vectors have the same angle (2 words have the same meaning or close enough) when the cosine is close to 1
2) whether 2 vectors are perpendicular (2 words don't have anything to do with each other) when the cosine is close to zero
3) whether 2 vectors are opposite in direction (2 words have opposite meanings in some aspect) when the cosine is close to -1
Cosine similarity is like comparing two people's interests.
If two people have similar interests, the angle between them is small, and the cosine similarity value will be high.
If two people have completely different interests, the angle between them is large, and the cosine similarity value will be low.
So, cosine similarity is a way to measure how similar two things are by looking at the angle between them.
Imagine that words are spread out in the space. Cosine similarity is a measure of similarity between two vectors (each word is encoded as a vector).
By measuring the cosine of the angle between the two vectors we can get:
1) whether 2 vectors have the same angle (2 words have the same meaning or close enough) when the cosine is close to 1
2) whether 2 vectors are perpendicular (2 words don't have anything to do with each other) when the cosine is close to zero
3) whether 2 vectors are opposite in direction (2 words have opposite meanings in some aspect) when the cosine is close to -1
Cosine similarity is like comparing two people's interests. If two people have similar interests, the angle between them is small, and the cosine similarity value will be high. If two people have completely different interests, the angle between them is large, and the cosine similarity value will be low. So, cosine similarity is a way to measure how similar two things are by looking at the angle between them.