k: k nearest neighbours weighting: weighting the neibours, default is these neighbours are equal features: \[batch, feature\] labels: \[batch\] total_dim: total dim of the feature p: the parameter p of [minkowski distance](https://en.wikipedia.org/wiki/Minkowski_distance) default is p = 2
(k: usize, weighting: Option<KNNWeighting>, features: Vec<Vec<f32>>, labels: Vec<T>, total_dim: usize, p: Option<usize>)
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