ML Metrics Pairwise

[junxnone]

Reference

• Pairwise metrics - scikit-learn

Brief

Pairwise Metrics	Formula	Description
Cosine similarity	$k(x, y) = \frac{x y^\top}{|x| |y|}$
Linear kernel	$k(x, y) = x^\top y$
Polynomial kernel	$k(x, y) = x^\top y$
Sigmoid kernel	$k(x, y) = (\gamma x^\top y +c_0)^d$
RBF kernel	$k(x, y) = \exp( -\gamma | x-y |^2)$
Laplacian kernel	$k(x, y) = \exp( -\gamma | x-y |_1)$
Chi-squared kernel	$k(x, y) = \exp \left (-\gamma \sum_i \frac{(x[i] - y[i]) ^ 2}{x[i] + y[i]} \right )$