The `get_nns_by_vector` method is a function in the `AnnoyIndex` class of the Python Annoy library. It is used to retrieve the nearest neighbors of a given vector in the index. The method takes a vector as input and returns a list of indices of the nearest neighbors, based on the cosine distance metric. This function is commonly used in tasks such as recommendation systems, information retrieval, and clustering, where finding similar items or documents is crucial.
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