回答一个老问题,同时具有相同的要求 - 我发现scikit文档很好地解释了一些方法。
http://scikit-learn.org/stable/auto_examples/model_selection/plot_roc.html
提及的方法包括:
- “二值化”,即问题转换为二进制分类,即使用宏平均或微平均
- 画出多个ROC曲线,一个每标签
- 一对所有
从上面的链接,使用他们的库这说明了一个与所有微平均复制例如:
print(__doc__)
import numpy as np
import matplotlib.pyplot as plt
from itertools import cycle
from sklearn import svm, datasets
from sklearn.metrics import roc_curve, auc
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import label_binarize
from sklearn.multiclass import OneVsRestClassifier
from scipy import interp
# Import some data to play with
iris = datasets.load_iris()
X = iris.data
y = iris.target
# Binarize the output
y = label_binarize(y, classes=[0, 1, 2])
n_classes = y.shape[1]
# Add noisy features to make the problem harder
random_state = np.random.RandomState(0)
n_samples, n_features = X.shape
X = np.c_[X, random_state.randn(n_samples, 200 * n_features)]
# shuffle and split training and test sets
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=.5,
random_state=0)
# Learn to predict each class against the other
classifier = OneVsRestClassifier(svm.SVC(kernel='linear', probability=True,
random_state=random_state))
y_score = classifier.fit(X_train, y_train).decision_function(X_test)
# Compute ROC curve and ROC area for each class
fpr = dict()
tpr = dict()
roc_auc = dict()
for i in range(n_classes):
fpr[i], tpr[i], _ = roc_curve(y_test[:, i], y_score[:, i])
roc_auc[i] = auc(fpr[i], tpr[i])
# Compute micro-average ROC curve and ROC area
fpr["micro"], tpr["micro"], _ = roc_curve(y_test.ravel(), y_score.ravel())
roc_auc["micro"] = auc(fpr["micro"], tpr["micro"])
实际上,我在寻找一个JavaScript解决方案(使用https://github.com/mljs/performance),所以我还没有与上述实施它图书馆,但这是迄今为止我发现的最具启发性的例子。
@ achim-zeileis,亲爱的任何提示? – Mahsolid
您希望在多类别分类的ROC曲线中显示什么? ROC曲线旨在显示二进制结果;更准确地说是两种比率:真正的积极与错误的积极您可以为您的六种情况建立每条曲线,但我不明白如何定义多种分类的单一ROC曲线。 – RHertel
我想要做所有的性能测量,就像我们为二进制一样。我已经读过,可以使用名为'pROC'的R包完成它,但我找不到一个工作示例。 – Mahsolid