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Lasso on dense and sparse data¶
We show that linear_model.Lasso provides the same results for dense and sparse data and that in the case of sparse data the speed is improved.
Out:
--- Dense matrices
Sparse Lasso done in 0.134139s
Dense Lasso done in 0.049522s
Distance between coefficients : 6.852225994430906e-14
--- Sparse matrices
Matrix density : 0.6263000000000001 %
Sparse Lasso done in 0.160597s
Dense Lasso done in 1.076999s
Distance between coefficients : 7.768625813853113e-12
print(__doc__)
from time import time
from scipy import sparse
from scipy import linalg
from sklearn.datasets import make_regression
from sklearn.linear_model import Lasso
# #############################################################################
# The two Lasso implementations on Dense data
print("--- Dense matrices")
X, y = make_regression(n_samples=200, n_features=5000, random_state=0)
X_sp = sparse.coo_matrix(X)
alpha = 1
sparse_lasso = Lasso(alpha=alpha, fit_intercept=False, max_iter=1000)
dense_lasso = Lasso(alpha=alpha, fit_intercept=False, max_iter=1000)
t0 = time()
sparse_lasso.fit(X_sp, y)
print("Sparse Lasso done in %fs" % (time() - t0))
t0 = time()
dense_lasso.fit(X, y)
print("Dense Lasso done in %fs" % (time() - t0))
print("Distance between coefficients : %s"
% linalg.norm(sparse_lasso.coef_ - dense_lasso.coef_))
# #############################################################################
# The two Lasso implementations on Sparse data
print("--- Sparse matrices")
Xs = X.copy()
Xs[Xs < 2.5] = 0.0
Xs = sparse.coo_matrix(Xs)
Xs = Xs.tocsc()
print("Matrix density : %s %%" % (Xs.nnz / float(X.size) * 100))
alpha = 0.1
sparse_lasso = Lasso(alpha=alpha, fit_intercept=False, max_iter=10000)
dense_lasso = Lasso(alpha=alpha, fit_intercept=False, max_iter=10000)
t0 = time()
sparse_lasso.fit(Xs, y)
print("Sparse Lasso done in %fs" % (time() - t0))
t0 = time()
dense_lasso.fit(Xs.toarray(), y)
print("Dense Lasso done in %fs" % (time() - t0))
print("Distance between coefficients : %s"
% linalg.norm(sparse_lasso.coef_ - dense_lasso.coef_))
Total running time of the script: ( 0 minutes 1.512 seconds)
