[mlpack] [mlpack/mlpack] cover tree optimization (#836)

[arirang-pust]

made distance calculations faster in cover trees by not computing the full distance if it is not needed
You can view, comment on, or merge this pull request online at:

  https://github.com/mlpack/mlpack/pull/836

-- Commit Summary --

  * made distance calculations faster in cover trees by not computing the full distance if it is not needed

-- File Changes --

    M src/mlpack/core/metrics/lmetric.hpp (6)
    M src/mlpack/core/metrics/lmetric_impl.hpp (20)
    M src/mlpack/core/tree/cover_tree/cover_tree.hpp (5)
    M src/mlpack/core/tree/cover_tree/cover_tree_impl.hpp (38)

-- Patch Links --

https://github.com/mlpack/mlpack/pull/836.patch
https://github.com/mlpack/mlpack/pull/836.diff

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