M***anifold *****hypothesis**
[Distance Algorithm](https://texonom.com/distance-algorithm-9b12bb4903424559a97f32c00f5ec351) 


assume that data is concentrated around a low-dimensional manifold
기존 차원보다 manifolded dimension distance가 더 중요




> [Manifold hypothesis](https://en.wikipedia.org/wiki/Manifold_hypothesis)






