Maximal-Marginal-Relevance
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set default value 0 of mmr, may lead to final doc is none, for that current_mmr may be always be negative
https://github.com/bwanglzu/Maximal-Marginal-Relevance/blob/1d722ac72200d26d431d17a97dc354637075d4d1/mmr/mmr.py#L35