Plot several randomly generated 2D classification datasets. This example illustrates the datasets.make_classification datasets.make_blobs and datasets.make_gaussian_quantiles functions. For make_classification, three binary and two multi-class classification datasets are generated, with different numbers of informative features and clusters per class. print(__doc__) import matplotlib.pyplot as plt from sklearn.datasets import make_classification from sklearn.datasets import make_blobs fr

This example shows how to perform univariate feature selection before running a SVC (support vector classifier) to improve the classification scores. print(__doc__) import numpy as np import matplotlib.pyplot as plt from sklearn import svm, datasets, feature_selection from sklearn.model_selection import cross_val_score from sklearn.pipeline import Pipeline Import some data to play with digits = datasets.load_digits() y = digits.target # Throw away data, to be in the curse of dimension settin

class sklearn.linear_model.LassoLars(alpha=1.0, fit_intercept=True, verbose=False, normalize=True, precompute='auto', max_iter=500, eps=2.2204460492503131e-16, copy_X=True, fit_path=True, positive=False) [source] Lasso model fit with Least Angle Regression a.k.a. Lars It is a Linear Model trained with an L1 prior as regularizer. The optimization objective for Lasso is: (1 / (2 * n_samples)) * ||y - Xw||^2_2 + alpha * ||w||_1 Read more in the User Guide. Parameters: alpha : float Constant

class sklearn.preprocessing.StandardScaler(copy=True, with_mean=True, with_std=True) [source] Standardize features by removing the mean and scaling to unit variance Centering and scaling happen independently on each feature by computing the relevant statistics on the samples in the training set. Mean and standard deviation are then stored to be used on later data using the transform method. Standardization of a dataset is a common requirement for many machine learning estimators: they might

sklearn.metrics.recall_score(y_true, y_pred, labels=None, pos_label=1, average='binary', sample_weight=None) [source] Compute the recall The recall is the ratio tp / (tp + fn) where tp is the number of true positives and fn the number of false negatives. The recall is intuitively the ability of the classifier to find all the positive samples. The best value is 1 and the worst value is 0. Read more in the User Guide. Parameters: y_true : 1d array-like, or label indicator array / sparse matr

sklearn.datasets.make_classification(n_samples=100, n_features=20, n_informative=2, n_redundant=2, n_repeated=0, n_classes=2, n_clusters_per_class=2, weights=None, flip_y=0.01, class_sep=1.0, hypercube=True, shift=0.0, scale=1.0, shuffle=True, random_state=None) [source] Generate a random n-class classification problem. This initially creates clusters of points normally distributed (std=1) about vertices of a 2 * class_sep-sided hypercube, and assigns an equal number of clusters to each cla

An example to illustrate multi-output regression with decision tree. The decision trees is used to predict simultaneously the noisy x and y observations of a circle given a single underlying feature. As a result, it learns local linear regressions approximating the circle. We can see that if the maximum depth of the tree (controlled by the max_depth parameter) is set too high, the decision trees learn too fine details of the training data and learn from the noise, i.e. they overfit. print(

sklearn.datasets.load_sample_image(image_name) [source] Load the numpy array of a single sample image Parameters: image_name: {`china.jpg`, `flower.jpg`} : The name of the sample image loaded Returns: img: 3D array : The image as a numpy array: height x width x color Examples >>> from sklearn.datasets import load_sample_image >>> china = load_sample_image('china.jpg') >>> china.dtype dtype('uint8') >>> china.shape

sklearn.svm.libsvm.cross_validation() Binding of the cross-validation routine (low-level routine) Parameters: X: array-like, dtype=float, size=[n_samples, n_features] : Y: array, dtype=float, size=[n_samples] : target vector svm_type : {0, 1, 2, 3, 4} Type of SVM: C SVC, nu SVC, one class, epsilon SVR, nu SVR kernel : {?linear?, ?rbf?, ?poly?, ?sigmoid?, ?precomputed?} Kernel to use in the model: linear, polynomial, RBF, sigmoid or precomputed. degree : int Degree of the polynomial

sklearn.datasets.make_swiss_roll(n_samples=100, noise=0.0, random_state=None) [source] Generate a swiss roll dataset. Read more in the User Guide. Parameters: n_samples : int, optional (default=100) The number of sample points on the S curve. noise : float, optional (default=0.0) The standard deviation of the gaussian noise. 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 ins