I am just interested to know if we can use the generated word embedding vectors to extract keywords from a document or not.
If yes, how?
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Word embeddings are just a way to represent tokens (often words, but could be characters) in a way that it inherently carries semantic meaning (i.e. as opposed to simply one-hot encoding), but it is not a keyphrase extraction technique.
Word embeddings can help you extract key phrases better because they will make your input more meaningful, but unless you have a technique to extract such phrases, they won't help you.