sklearn.datasets.make_friedman2()

sklearn.datasets.make_friedman2(n_samples=100, noise=0.0, random_state=None) [source]

Generate the ?Friedman #2? regression problem

This dataset is described in Friedman [1] and Breiman [2].

Inputs X are 4 independent features uniformly distributed on the intervals:

0 <= X[:, 0] <= 100,
40 * pi <= X[:, 1] <= 560 * pi,
0 <= X[:, 2] <= 1,
1 <= X[:, 3] <= 11.

The output y is created according to the formula:

y(X) = (X[:, 0] ** 2 + (X[:, 1] * X[:, 2]  - 1 / (X[:, 1] * X[:, 3])) ** 2) ** 0.5 + noise * N(0, 1).

Parameters:	n_samples : int, optional (default=100) The number of samples. noise : float, optional (default=0.0) The standard deviation of the gaussian noise applied to the output. random_state : int, RandomState instance or None, optional (default=None) If int, random_state is the seed used by the random number generator; If RandomState instance, random_state is the random number generator; If None, the random number generator is the RandomState instance used by `np.random`.
Returns:	X : array of shape [n_samples, 4] The input samples. y : array of shape [n_samples] The output values.

J. Friedman, ?Multivariate adaptive regression splines?, The Annals of Statistics 19 (1), pages 1-67, 1991.

L. Breiman, ?Bagging predictors?, Machine Learning 24, pages 123-140, 1996.

Links:

doc_scikit_learn

2017-01-15 04:25:55

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