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在我運行下面的代碼後。cm = plt.cm.RdBu是什麼意思?
import matplotlib.pyplot as plt
from matplotlib.colors import ListedColormap
cm = plt.cm.RdBu
cm_bright = ListedColormap(['#FF0000', '#0000FF'])
ax = plt.subplot()
ax.set_title("Input data")
# Plot the training points
ax.scatter(X[:, 0], X[:, 1], c=y, cmap=cm_bright)
ax.set_xticks(())
ax.set_yticks(())
plt.tight_layout()
plt.show()
然而,當我註釋的代碼cm = plt.cm.RdBu
,結果不會改變。 那麼,問題是代碼cm = plt.cm.RdBu
的用法是什麼?