Question: Why getting a min-hash for a single sample is possible?

[bdeng3]

Say if we have three documents A, B and C. Each document might contains different words.

According to the document of data sketch.MinHash, we can get a min-hash for A with

minxish = Minhash(num_perm=128)
minhash.update(A.encode('utf-8'))
vector = minhash.digest()

But isn't that we need to create a vocabulary consisting of all words from A, B and C before getting the vector?

[akuuzii]

I'm also interested in seeing this topic answered.

[ekzhu]

Good question. The idea here is to "cheat" by mapping each token (or "word" in your example) to an integer in the hash space, which we know the complete vocabulary -- all integers 0 - 2^32!