In [11]:
print(__doc__)

import numpy as np
import matplotlib.pyplot as plt
from sklearn import linear_model

# X is the 10x10 Hilbert matrix
#print(np.newaxis)
#print(1. / np.arange(1,11) + np.arange(0,10)[:,np.newaxis] )
X = 1. / (np.arange(1, 11) + np.arange(0, 10)[:, np.newaxis])
y = np.ones(10)
print(X)
print(y)

n_alphas = 200
alphas = np.logspace(-10, -2, n_alphas)
print(alphas)
coefs = []
for a in alphas:
    print('a',a)
    ridge = linear_model.Ridge(alpha=a, fit_intercept=False)
    ridge.fit(X, y)
    coefs.append(ridge.coef_)
print(coefs)    
ax = plt.gca()

ax.plot(alphas, coefs)
ax.set_xscale('log')
ax.set_xlim(ax.get_xlim()[::-1])  # reverse axis
plt.xlabel('alpha')
plt.ylabel('weights')
plt.title('Ridge coefficients as a function of the regularization')
plt.axis('tight')
plt.show()


Automatically created module for IPython interactive environment
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   0.14285714  0.125       0.11111111  0.1       ]
 [ 0.5         0.33333333  0.25        0.2         0.16666667  0.14285714
   0.125       0.11111111  0.1         0.09090909]
 [ 0.33333333  0.25        0.2         0.16666667  0.14285714  0.125
   0.11111111  0.1         0.09090909  0.08333333]
 [ 0.25        0.2         0.16666667  0.14285714  0.125       0.11111111
   0.1         0.09090909  0.08333333  0.07692308]
 [ 0.2         0.16666667  0.14285714  0.125       0.11111111  0.1
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 [ 0.16666667  0.14285714  0.125       0.11111111  0.1         0.09090909
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 [ 0.125       0.11111111  0.1         0.09090909  0.08333333  0.07692308
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 [ 0.11111111  0.1         0.09090909  0.08333333  0.07692308  0.07142857
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 [ 0.1         0.09090909  0.08333333  0.07692308  0.07142857  0.06666667
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