sklearn.metrics.pairwise.polynomial_kernel¶

sklearn.metrics.pairwise.polynomial_kernel(X, Y=None, degree=3, gamma=None, coef0=1)[source]¶

Compute the polynomial kernel between X and Y:

K(X, Y) = (gamma <X, Y> + coef0)^degree

Read more in the User Guide.

Parameters

Xndarray of shape (n_samples_1, n_features)

Yndarray of shape (n_samples_2, n_features)

degreeint, default 3

gammafloat, default None

if None, defaults to 1.0 / n_features

coef0float, default 1

Returns

Gram matrixarray of shape (n_samples_1, n_samples_2)