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[MRG] modified svm example to use contour function #19387

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Merged
merged 2 commits into from
Feb 8, 2021
Merged

[MRG] modified svm example to use contour function #19387

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0484a16
modified svm example to use contour function
amy12xx Feb 6, 2021
3d0c44c
fix pylint issues
amy12xx Feb 7, 2021
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18 changes: 10 additions & 8 deletions examples/svm/plot_svm_margin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@

import numpy as np
import matplotlib.pyplot as plt
from matplotlib import cm
from sklearn import svm

# we create 40 separable points
Expand Down Expand Up @@ -62,8 +63,9 @@
plt.plot(xx, yy_up, 'k--')

plt.scatter(clf.support_vectors_[:, 0], clf.support_vectors_[:, 1], s=80,
facecolors='none', zorder=10, edgecolors='k')
plt.scatter(X[:, 0], X[:, 1], c=Y, zorder=10, cmap=plt.cm.Paired,
facecolors='none', zorder=10, edgecolors='k',
cmap=cm.get_cmap('RdBu'))
plt.scatter(X[:, 0], X[:, 1], c=Y, zorder=10, cmap=cm.get_cmap('RdBu'),
edgecolors='k')

plt.axis('tight')
Expand All @@ -72,13 +74,13 @@
y_min = -6
y_max = 6

XX, YY = np.mgrid[x_min:x_max:200j, y_min:y_max:200j]
Z = clf.predict(np.c_[XX.ravel(), YY.ravel()])
YY, XX = np.meshgrid(yy, xx)
xy = np.vstack([XX.ravel(), YY.ravel()]).T
Z = clf.decision_function(xy).reshape(XX.shape)

# Put the result into a color plot
Z = Z.reshape(XX.shape)
plt.figure(fignum, figsize=(4, 3))
plt.pcolormesh(XX, YY, Z, cmap=plt.cm.Paired)
# Put the result into a contour plot
plt.contourf(XX, YY, Z, cmap=cm.get_cmap('RdBu'),
alpha=0.5, linestyles=['-'])

plt.xlim(x_min, x_max)
plt.ylim(y_min, y_max)
Expand Down