Skip to content

Instantly share code, notes, and snippets.

Mathieu Blondel mblondel

View GitHub Profile
View multiclass_svm.py
"""
Multiclass SVMs (Crammer-Singer formulation).
A pure Python re-implementation of:
Large-scale Multiclass Support Vector Machine Training via Euclidean Projection onto the Simplex.
Mathieu Blondel, Akinori Fujino, and Naonori Ueda.
ICPR 2014.
http://www.mblondel.org/publications/mblondel-icpr2014.pdf
"""
@mblondel
mblondel / svm.py
Last active Apr 17, 2019
Support Vector Machines
View svm.py
# Mathieu Blondel, September 2010
# License: BSD 3 clause
import numpy as np
from numpy import linalg
import cvxopt
import cvxopt.solvers
def linear_kernel(x1, x2):
return np.dot(x1, x2)
@mblondel
mblondel / statistical_tests.py
Last active Apr 16, 2019
t-test and wilcoxon-test examples in Python
View statistical_tests.py
# Mathieu Blondel, February 2012
# License: BSD 3 clause
# Port to Python of examples in chapter 5 of
# "Introductory Statistics with R" by Peter Dalgaard
import numpy as np
from scipy.stats import ttest_1samp, wilcoxon, ttest_ind, mannwhitneyu
# daily intake of energy in kJ for 11 women
@mblondel
mblondel / seminb.py
Created Oct 28, 2015
Semi-supervised Naive Bayes
View seminb.py
# -*- coding: utf-8 -*-
# Copyright (C) 2010 Mathieu Blondel
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
@mblondel
mblondel / nmf_cd.py
Last active Apr 4, 2019
NMF by coordinate descent
View nmf_cd.py
"""
NMF by coordinate descent, designed for sparse data (without missing values)
"""
# Author: Mathieu Blondel <mathieu@mblondel.org>
# License: BSD 3 clause
import numpy as np
import scipy.sparse as sp
import numba
@mblondel
mblondel / letor_metrics.py
Last active Apr 1, 2019
Learning to rank metrics.
View letor_metrics.py
# (C) Mathieu Blondel, November 2013
# License: BSD 3 clause
import numpy as np
def ranking_precision_score(y_true, y_score, k=10):
"""Precision at rank k
Parameters
@mblondel
mblondel / perceptron.py
Last active Mar 20, 2019
Kernel Perceptron
View perceptron.py
# Mathieu Blondel, October 2010
# License: BSD 3 clause
import numpy as np
from numpy import linalg
def linear_kernel(x1, x2):
return np.dot(x1, x2)
def polynomial_kernel(x, y, p=3):
@mblondel
mblondel / lda_gibbs.py
Last active Mar 8, 2019
Latent Dirichlet Allocation with Gibbs sampler
View lda_gibbs.py
"""
(C) Mathieu Blondel - 2010
License: BSD 3 clause
Implementation of the collapsed Gibbs sampler for
Latent Dirichlet Allocation, as described in
Finding scientifc topics (Griffiths and Steyvers)
"""
@mblondel
mblondel / projection_simplex.py
Created Nov 2, 2014
Projection onto the simplex
View projection_simplex.py
"""
Implements three algorithms for projecting a vector onto the simplex: sort, pivot and bisection.
For details and references, see the following paper:
Large-scale Multiclass Support Vector Machine Training via Euclidean Projection onto the Simplex
Mathieu Blondel, Akinori Fujino, and Naonori Ueda.
ICPR 2014.
http://www.mblondel.org/publications/mblondel-icpr2014.pdf
View kernel_kmeans.py
"""Kernel K-means"""
# Author: Mathieu Blondel <mathieu@mblondel.org>
# License: BSD 3 clause
import numpy as np
from sklearn.base import BaseEstimator, ClusterMixin
from sklearn.metrics.pairwise import pairwise_kernels
from sklearn.utils import check_random_state
You can’t perform that action at this time.