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plot iso-f1 curves in plot_precision_recall #8366

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plot iso-f1 curves in plot_precision_recall #8366

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15 changes: 15 additions & 0 deletions examples/model_selection/plot_precision_recall.py
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Expand Up @@ -127,6 +127,21 @@
average="micro")


# Plot ISO-F1 curve
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ISO is international standards organisation. "Iso-" is a greek-derived prefix meaning equal

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aah yes, will change it!

plt.clf()
f_scores = np.linspace(0.1, 0.9, num=9)
for F in f_scores:
x = R = np.linspace(0.01, 1)
y = F * R / (2 * R - F)
plt.plot(x[y >= 0], y[y >= 0], color='navy')
plt.annotate('f1={0:0.1f}'.format(F), xy=(0.9, y[45] + 0.02))
plt.xlabel('Recall')
plt.ylabel('Precision')
plt.xlim([0.0, 1.0])
plt.ylim([0.0, 1.0])
plt.title('ISO-F1 curves')
plt.show()

# Plot Precision-Recall curve
plt.clf()
plt.plot(recall[0], precision[0], lw=lw, color='navy',
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