363 lines
14 KiB
Python
363 lines
14 KiB
Python
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import pytest
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import numpy as np
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from numpy.testing import assert_array_almost_equal, assert_array_equal
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from scipy import sparse
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from sklearn import datasets, svm, linear_model, base
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from sklearn.datasets import make_classification, load_digits, make_blobs
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from sklearn.svm.tests import test_svm
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from sklearn.exceptions import ConvergenceWarning
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from sklearn.utils.extmath import safe_sparse_dot
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from sklearn.utils._testing import (assert_warns,
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assert_raise_message, ignore_warnings,
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skip_if_32bit)
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# test sample 1
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X = np.array([[-2, -1], [-1, -1], [-1, -2], [1, 1], [1, 2], [2, 1]])
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X_sp = sparse.lil_matrix(X)
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Y = [1, 1, 1, 2, 2, 2]
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T = np.array([[-1, -1], [2, 2], [3, 2]])
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true_result = [1, 2, 2]
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# test sample 2
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X2 = np.array([[0, 0, 0], [1, 1, 1], [2, 0, 0, ],
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[0, 0, 2], [3, 3, 3]])
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X2_sp = sparse.dok_matrix(X2)
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Y2 = [1, 2, 2, 2, 3]
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T2 = np.array([[-1, -1, -1], [1, 1, 1], [2, 2, 2]])
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true_result2 = [1, 2, 3]
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iris = datasets.load_iris()
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# permute
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rng = np.random.RandomState(0)
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perm = rng.permutation(iris.target.size)
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iris.data = iris.data[perm]
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iris.target = iris.target[perm]
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# sparsify
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iris.data = sparse.csr_matrix(iris.data)
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def check_svm_model_equal(dense_svm, sparse_svm, X_train, y_train, X_test):
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dense_svm.fit(X_train.toarray(), y_train)
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if sparse.isspmatrix(X_test):
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X_test_dense = X_test.toarray()
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else:
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X_test_dense = X_test
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sparse_svm.fit(X_train, y_train)
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assert sparse.issparse(sparse_svm.support_vectors_)
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assert sparse.issparse(sparse_svm.dual_coef_)
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assert_array_almost_equal(dense_svm.support_vectors_,
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sparse_svm.support_vectors_.toarray())
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assert_array_almost_equal(dense_svm.dual_coef_,
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sparse_svm.dual_coef_.toarray())
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if dense_svm.kernel == "linear":
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assert sparse.issparse(sparse_svm.coef_)
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assert_array_almost_equal(dense_svm.coef_, sparse_svm.coef_.toarray())
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assert_array_almost_equal(dense_svm.support_, sparse_svm.support_)
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assert_array_almost_equal(dense_svm.predict(X_test_dense),
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sparse_svm.predict(X_test))
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assert_array_almost_equal(dense_svm.decision_function(X_test_dense),
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sparse_svm.decision_function(X_test))
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assert_array_almost_equal(dense_svm.decision_function(X_test_dense),
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sparse_svm.decision_function(X_test_dense))
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if isinstance(dense_svm, svm.OneClassSVM):
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msg = "cannot use sparse input in 'OneClassSVM' trained on dense data"
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else:
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assert_array_almost_equal(dense_svm.predict_proba(X_test_dense),
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sparse_svm.predict_proba(X_test), 4)
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msg = "cannot use sparse input in 'SVC' trained on dense data"
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if sparse.isspmatrix(X_test):
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assert_raise_message(ValueError, msg, dense_svm.predict, X_test)
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@skip_if_32bit
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def test_svc():
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"""Check that sparse SVC gives the same result as SVC"""
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# many class dataset:
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X_blobs, y_blobs = make_blobs(n_samples=100, centers=10, random_state=0)
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X_blobs = sparse.csr_matrix(X_blobs)
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datasets = [[X_sp, Y, T], [X2_sp, Y2, T2],
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[X_blobs[:80], y_blobs[:80], X_blobs[80:]],
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[iris.data, iris.target, iris.data]]
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kernels = ["linear", "poly", "rbf", "sigmoid"]
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for dataset in datasets:
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for kernel in kernels:
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clf = svm.SVC(gamma=1, kernel=kernel, probability=True,
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random_state=0, decision_function_shape='ovo')
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sp_clf = svm.SVC(gamma=1, kernel=kernel, probability=True,
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random_state=0, decision_function_shape='ovo')
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check_svm_model_equal(clf, sp_clf, *dataset)
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def test_unsorted_indices():
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# test that the result with sorted and unsorted indices in csr is the same
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# we use a subset of digits as iris, blobs or make_classification didn't
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# show the problem
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X, y = load_digits(return_X_y=True)
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X_test = sparse.csr_matrix(X[50:100])
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X, y = X[:50], y[:50]
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X_sparse = sparse.csr_matrix(X)
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coef_dense = svm.SVC(kernel='linear', probability=True,
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random_state=0).fit(X, y).coef_
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sparse_svc = svm.SVC(kernel='linear', probability=True,
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random_state=0).fit(X_sparse, y)
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coef_sorted = sparse_svc.coef_
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# make sure dense and sparse SVM give the same result
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assert_array_almost_equal(coef_dense, coef_sorted.toarray())
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# reverse each row's indices
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def scramble_indices(X):
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new_data = []
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new_indices = []
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for i in range(1, len(X.indptr)):
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row_slice = slice(*X.indptr[i - 1: i + 1])
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new_data.extend(X.data[row_slice][::-1])
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new_indices.extend(X.indices[row_slice][::-1])
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return sparse.csr_matrix((new_data, new_indices, X.indptr),
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shape=X.shape)
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X_sparse_unsorted = scramble_indices(X_sparse)
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X_test_unsorted = scramble_indices(X_test)
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assert not X_sparse_unsorted.has_sorted_indices
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assert not X_test_unsorted.has_sorted_indices
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unsorted_svc = svm.SVC(kernel='linear', probability=True,
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random_state=0).fit(X_sparse_unsorted, y)
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coef_unsorted = unsorted_svc.coef_
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# make sure unsorted indices give same result
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assert_array_almost_equal(coef_unsorted.toarray(), coef_sorted.toarray())
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assert_array_almost_equal(sparse_svc.predict_proba(X_test_unsorted),
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sparse_svc.predict_proba(X_test))
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def test_svc_with_custom_kernel():
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def kfunc(x, y):
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return safe_sparse_dot(x, y.T)
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clf_lin = svm.SVC(kernel='linear').fit(X_sp, Y)
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clf_mylin = svm.SVC(kernel=kfunc).fit(X_sp, Y)
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assert_array_equal(clf_lin.predict(X_sp), clf_mylin.predict(X_sp))
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def test_svc_iris():
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# Test the sparse SVC with the iris dataset
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for k in ('linear', 'poly', 'rbf'):
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sp_clf = svm.SVC(kernel=k).fit(iris.data, iris.target)
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clf = svm.SVC(kernel=k).fit(iris.data.toarray(),
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iris.target)
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assert_array_almost_equal(clf.support_vectors_,
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sp_clf.support_vectors_.toarray())
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assert_array_almost_equal(clf.dual_coef_, sp_clf.dual_coef_.toarray())
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assert_array_almost_equal(
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clf.predict(iris.data.toarray()), sp_clf.predict(iris.data))
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if k == 'linear':
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assert_array_almost_equal(clf.coef_, sp_clf.coef_.toarray())
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def test_sparse_decision_function():
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# Test decision_function
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# Sanity check, test that decision_function implemented in python
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# returns the same as the one in libsvm
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# multi class:
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svc = svm.SVC(kernel='linear', C=0.1, decision_function_shape='ovo')
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clf = svc.fit(iris.data, iris.target)
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dec = safe_sparse_dot(iris.data, clf.coef_.T) + clf.intercept_
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assert_array_almost_equal(dec, clf.decision_function(iris.data))
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# binary:
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clf.fit(X, Y)
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dec = np.dot(X, clf.coef_.T) + clf.intercept_
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prediction = clf.predict(X)
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assert_array_almost_equal(dec.ravel(), clf.decision_function(X))
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assert_array_almost_equal(
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prediction,
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clf.classes_[(clf.decision_function(X) > 0).astype(np.int).ravel()])
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expected = np.array([-1., -0.66, -1., 0.66, 1., 1.])
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assert_array_almost_equal(clf.decision_function(X), expected, 2)
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def test_error():
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# Test that it gives proper exception on deficient input
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# impossible value of C
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with pytest.raises(ValueError):
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svm.SVC(C=-1).fit(X, Y)
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# impossible value of nu
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clf = svm.NuSVC(nu=0.0)
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with pytest.raises(ValueError):
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clf.fit(X_sp, Y)
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Y2 = Y[:-1] # wrong dimensions for labels
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with pytest.raises(ValueError):
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clf.fit(X_sp, Y2)
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clf = svm.SVC()
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clf.fit(X_sp, Y)
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assert_array_equal(clf.predict(T), true_result)
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def test_linearsvc():
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# Similar to test_SVC
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clf = svm.LinearSVC(random_state=0).fit(X, Y)
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sp_clf = svm.LinearSVC(random_state=0).fit(X_sp, Y)
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assert sp_clf.fit_intercept
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assert_array_almost_equal(clf.coef_, sp_clf.coef_, decimal=4)
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assert_array_almost_equal(clf.intercept_, sp_clf.intercept_, decimal=4)
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assert_array_almost_equal(clf.predict(X), sp_clf.predict(X_sp))
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clf.fit(X2, Y2)
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sp_clf.fit(X2_sp, Y2)
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assert_array_almost_equal(clf.coef_, sp_clf.coef_, decimal=4)
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assert_array_almost_equal(clf.intercept_, sp_clf.intercept_, decimal=4)
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def test_linearsvc_iris():
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# Test the sparse LinearSVC with the iris dataset
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sp_clf = svm.LinearSVC(random_state=0).fit(iris.data, iris.target)
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clf = svm.LinearSVC(random_state=0).fit(iris.data.toarray(), iris.target)
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assert clf.fit_intercept == sp_clf.fit_intercept
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assert_array_almost_equal(clf.coef_, sp_clf.coef_, decimal=1)
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assert_array_almost_equal(clf.intercept_, sp_clf.intercept_, decimal=1)
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assert_array_almost_equal(
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clf.predict(iris.data.toarray()), sp_clf.predict(iris.data))
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# check decision_function
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pred = np.argmax(sp_clf.decision_function(iris.data), 1)
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assert_array_almost_equal(pred, clf.predict(iris.data.toarray()))
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# sparsify the coefficients on both models and check that they still
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# produce the same results
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clf.sparsify()
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assert_array_equal(pred, clf.predict(iris.data))
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sp_clf.sparsify()
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assert_array_equal(pred, sp_clf.predict(iris.data))
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def test_weight():
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# Test class weights
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X_, y_ = make_classification(n_samples=200, n_features=100,
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weights=[0.833, 0.167], random_state=0)
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X_ = sparse.csr_matrix(X_)
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for clf in (linear_model.LogisticRegression(),
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svm.LinearSVC(random_state=0),
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svm.SVC()):
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clf.set_params(class_weight={0: 5})
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clf.fit(X_[:180], y_[:180])
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y_pred = clf.predict(X_[180:])
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assert np.sum(y_pred == y_[180:]) >= 11
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def test_sample_weights():
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# Test weights on individual samples
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clf = svm.SVC()
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clf.fit(X_sp, Y)
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assert_array_equal(clf.predict([X[2]]), [1.])
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sample_weight = [.1] * 3 + [10] * 3
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clf.fit(X_sp, Y, sample_weight=sample_weight)
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assert_array_equal(clf.predict([X[2]]), [2.])
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def test_sparse_liblinear_intercept_handling():
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# Test that sparse liblinear honours intercept_scaling param
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test_svm.test_dense_liblinear_intercept_handling(svm.LinearSVC)
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@pytest.mark.parametrize("datasets_index", range(4))
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@pytest.mark.parametrize("kernel", ["linear", "poly", "rbf", "sigmoid"])
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@skip_if_32bit
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def test_sparse_oneclasssvm(datasets_index, kernel):
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# Check that sparse OneClassSVM gives the same result as dense OneClassSVM
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# many class dataset:
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X_blobs, _ = make_blobs(n_samples=100, centers=10, random_state=0)
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X_blobs = sparse.csr_matrix(X_blobs)
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datasets = [[X_sp, None, T], [X2_sp, None, T2],
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[X_blobs[:80], None, X_blobs[80:]],
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[iris.data, None, iris.data]]
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dataset = datasets[datasets_index]
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clf = svm.OneClassSVM(gamma=1, kernel=kernel)
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sp_clf = svm.OneClassSVM(gamma=1, kernel=kernel)
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check_svm_model_equal(clf, sp_clf, *dataset)
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def test_sparse_realdata():
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# Test on a subset from the 20newsgroups dataset.
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# This catches some bugs if input is not correctly converted into
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# sparse format or weights are not correctly initialized.
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data = np.array([0.03771744, 0.1003567, 0.01174647, 0.027069])
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indices = np.array([6, 5, 35, 31])
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indptr = np.array(
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[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4])
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X = sparse.csr_matrix((data, indices, indptr))
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y = np.array(
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[1., 0., 2., 2., 1., 1., 1., 2., 2., 0., 1., 2., 2.,
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0., 2., 0., 3., 0., 3., 0., 1., 1., 3., 2., 3., 2.,
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0., 3., 1., 0., 2., 1., 2., 0., 1., 0., 2., 3., 1.,
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3., 0., 1., 0., 0., 2., 0., 1., 2., 2., 2., 3., 2.,
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0., 3., 2., 1., 2., 3., 2., 2., 0., 1., 0., 1., 2.,
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3., 0., 0., 2., 2., 1., 3., 1., 1., 0., 1., 2., 1.,
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|
|
1., 3.])
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|
|
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clf = svm.SVC(kernel='linear').fit(X.toarray(), y)
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sp_clf = svm.SVC(kernel='linear').fit(sparse.coo_matrix(X), y)
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|
|
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assert_array_equal(clf.support_vectors_, sp_clf.support_vectors_.toarray())
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assert_array_equal(clf.dual_coef_, sp_clf.dual_coef_.toarray())
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|
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|
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def test_sparse_svc_clone_with_callable_kernel():
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|
# Test that the "dense_fit" is called even though we use sparse input
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|
|
# meaning that everything works fine.
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|
a = svm.SVC(C=1, kernel=lambda x, y: x * y.T,
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||
|
|
probability=True, random_state=0)
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||
|
|
b = base.clone(a)
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||
|
|
|
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|
b.fit(X_sp, Y)
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||
|
|
pred = b.predict(X_sp)
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||
|
|
b.predict_proba(X_sp)
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||
|
|
|
||
|
|
dense_svm = svm.SVC(C=1, kernel=lambda x, y: np.dot(x, y.T),
|
||
|
|
probability=True, random_state=0)
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||
|
|
pred_dense = dense_svm.fit(X, Y).predict(X)
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||
|
|
assert_array_equal(pred_dense, pred)
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||
|
|
# b.decision_function(X_sp) # XXX : should be supported
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||
|
|
|
||
|
|
|
||
|
|
def test_timeout():
|
||
|
|
sp = svm.SVC(C=1, kernel=lambda x, y: x * y.T,
|
||
|
|
probability=True, random_state=0, max_iter=1)
|
||
|
|
|
||
|
|
assert_warns(ConvergenceWarning, sp.fit, X_sp, Y)
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||
|
|
|
||
|
|
|
||
|
|
def test_consistent_proba():
|
||
|
|
a = svm.SVC(probability=True, max_iter=1, random_state=0)
|
||
|
|
with ignore_warnings(category=ConvergenceWarning):
|
||
|
|
proba_1 = a.fit(X, Y).predict_proba(X)
|
||
|
|
a = svm.SVC(probability=True, max_iter=1, random_state=0)
|
||
|
|
with ignore_warnings(category=ConvergenceWarning):
|
||
|
|
proba_2 = a.fit(X, Y).predict_proba(X)
|
||
|
|
assert_array_almost_equal(proba_1, proba_2)
|