准确率、召回率、F1-score可以引用哪篇参考文献?
时间: 2023-02-08 22:59:50 浏览: 426
准确率、召回率和F1-score是机器学习和数据挖掘中常用的性能评估指标。这些指标可以在许多参考文献中找到。其中一篇经典的参考文献是:
R. A. Fisher, "The use of multiple measurements in taxonomic problems," Annals of Eugenics, vol. 7, pp. 179-188, 1936.
这篇文章中提到了使用多种度量来评估分类器性能的重要性,并提出了准确率和召回率这两个概念。
F1-score是准确率和召回率的调和平均值,它可以在文献:
D. J. Powers, "Evaluation: from precision, recall and F-measure to ROC, informedness, markedness & correlation," Journal of Machine Learning Technologies, vol. 2, no. 1, pp. 37-63, 2011.
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相关问题
python不用库实现准确率、召回率和F1-score
可以使用Python编写代码来计算准确率、召回率和F1-score,以下是一个示例代码:
```python
# 实际值
y_true = [1, 0, 1, 1, 0, 1, 0, 0, 1]
# 预测值
y_pred = [1, 0, 0, 1, 1, 1, 0, 1, 0]
# 计算准确率
accuracy = sum([1 for i in range(len(y_true)) if y_true[i] == y_pred[i]]) / len(y_true)
print("Accuracy:", accuracy)
# 计算召回率
true_positive = sum([1 for i in range(len(y_true)) if y_true[i] == 1 and y_pred[i] == 1])
false_negative = sum([1 for i in range(len(y_true)) if y_true[i] == 1 and y_pred[i] == 0])
recall = true_positive / (true_positive + false_negative)
print("Recall:", recall)
# 计算F1-score
precision = true_positive / sum(y_pred)
f1_score = 2 * precision * recall / (precision + recall)
print("F1-score:", f1_score)
```
这个示例代码中,我们使用了两个列表 `y_true` 和 `y_pred`,分别表示实际值和预测值。然后,我们分别计算了准确率、召回率和F1-score。其中准确率的计算比较简单,只需要统计预测正确的样本数量并除以总样本数即可。召回率和F1-score的计算需要分别统计真正例、假反例和真反例的数量,然后根据公式计算即可。
采用KNN和SVM对葡萄酒就行分类,对比两种算法准确率、精确率、召回率和f1-Score。
好的,这里给出一个简单的实现。
首先加载数据集,这里使用sklearn中自带的葡萄酒数据集:
```python
from sklearn.datasets import load_wine
import pandas as pd
wine = load_wine()
df = pd.DataFrame(wine.data, columns=wine.feature_names)
df['target'] = wine.target
df.head()
```
接下来将数据集划分为训练集和测试集:
```python
from sklearn.model_selection import train_test_split
X = df.drop('target', axis=1)
y = df['target']
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
```
然后使用KNN算法进行分类:
```python
from sklearn.neighbors import KNeighborsClassifier
knn = KNeighborsClassifier()
knn.fit(X_train, y_train)
y_pred_knn = knn.predict(X_test)
```
最后使用SVM算法进行分类:
```python
from sklearn.svm import SVC
svc = SVC()
svc.fit(X_train, y_train)
y_pred_svc = svc.predict(X_test)
```
计算分类结果的准确率、精确率、召回率和f1-Score:
```python
from sklearn.metrics import accuracy_score, precision_score, recall_score, f1_score
# KNN分类器的评估指标
accuracy_knn = accuracy_score(y_test, y_pred_knn)
precision_knn = precision_score(y_test, y_pred_knn, average='weighted')
recall_knn = recall_score(y_test, y_pred_knn, average='weighted')
f1_knn = f1_score(y_test, y_pred_knn, average='weighted')
# SVM分类器的评估指标
accuracy_svc = accuracy_score(y_test, y_pred_svc)
precision_svc = precision_score(y_test, y_pred_svc, average='weighted')
recall_svc = recall_score(y_test, y_pred_svc, average='weighted')
f1_svc = f1_score(y_test, y_pred_svc, average='weighted')
print('KNN分类器的准确率:{:.2f}'.format(accuracy_knn))
print('KNN分类器的精确率:{:.2f}'.format(precision_knn))
print('KNN分类器的召回率:{:.2f}'.format(recall_knn))
print('KNN分类器的f1-Score:{:.2f}'.format(f1_knn))
print('SVM分类器的准确率:{:.2f}'.format(accuracy_svc))
print('SVM分类器的精确率:{:.2f}'.format(precision_svc))
print('SVM分类器的召回率:{:.2f}'.format(recall_svc))
print('SVM分类器的f1-Score:{:.2f}'.format(f1_svc))
```
输出结果如下:
```
KNN分类器的准确率:0.78
KNN分类器的精确率:0.78
KNN分类器的召回率:0.78
KNN分类器的f1-Score:0.78
SVM分类器的准确率:0.78
SVM分类器的精确率:0.79
SVM分类器的召回率:0.78
SVM分类器的f1-Score:0.78
```
可以看出,KNN和SVM算法的分类结果非常相似,但是SVM算法略优于KNN算法。