This is to add save_local and load_local to tfidf_vectorizer and docs in
tfidf_retriever to make the vectorizer reusable.
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- Description: add save_local and load_local to tfidf_vectorizer and
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- Tag maintainer: @rlancemartin, @eyurtsev
- Twitter handle: @MlopsJ
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Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
