AttributeError: 'DecisionTreeClassifier' object has no attribute 'precision_score'

Question

我最近才开始学习数据科学。这是我写的：

import pandas as pd
from sklearn.tree import DecisionTreeClassifier
 from sklearn.linear_model import LogisticRegression
 from sklearn.model_selection import KFold
 from sklearn.metrics import precision_score, recall_score
 import numpy as np

 #reading data
 df = pd.read_csv('titanic.csv')
 df['male'] = df['Sex'] == 'male'
 X = df[['Pclass', 'male', 'Age', 'Siblings/Spouses', 'Parents/Children', 'Fare']].values
 y = df['Survived'].values

 #spliting data into train/test
 kf = KFold(n_splits=4+1, shuffle=True, random_state=10)
 tree_scores = {'accuracy_scores':[],'precision_scores':[],'recall_scores':[]}
 logistic_scores = {'accuracy_scores':[],'precision_scores':[],'recall_scores':[]}

 #making the models
 for train_indexes, test_indexes in kf.split(X):
     X_train, X_test = X[train_indexes], X[test_indexes]
     y_train, y_test = y[train_indexes], y[test_indexes]

     tree = DecisionTreeClassifier()
     tree.fit(X_train, y_train)
     tree_scores['accuracy_scores'].append(tree.score(X_test,y_test))
     tree_prediction = tree.predict(X_test)
     #tree_scores['precision_scores'].append(tree.precision_score(y_test,tree_prediction))
     #tree_scores['recall_scores'].append(tree.recall_score(y_test,tree_prediction))

     logistic = LogisticRegression()
     logistic.fit(X_train,y_train)
     logistic_scores['accuracy_scores'].append(logistic.score(X_test,y_test))
     logistic_prediction = logistic.predict(X_test)
     logistic_scores['precision_scores'].append(precision_score(y_test,logistic_prediction))
     logistic_scores['recall_scores'].append(recall_score(y_test,logistic_prediction))

 print("Decision Tree")
 print("  accuracy:", np.mean(tree_scores['accuracy_scores']))
 print("  precision:", np.mean(tree_scores['precision_scores']))
 print("  recall:", np.mean(tree_scores['recall_scores']))
 print("Logistic Regression")
 print("  accuracy:", np.mean(logistic_scores['accuracy_scores']))
 print("  precision:", np.mean(logistic_scores['precision_scores']))
 print("  recall:", np.mean(logistic_scores['recall_scores']))

for 循环中注释的两行给出精度和回想起来的错误，我不知道为什么。尽管在我运行之前，他们的精度和回忆都起作用了。而且我似乎也找不到任何拼写错误。

我想知道不同的 python 语法是否会干扰 sklearn？因为一旦我尝试了这样的组合：

X = df.loc['Plass':'Fare'].values
y = df.Survived.values

它给出了错误，但是当我使用正常的预期方式时它工作正常。

（注意：代码可能缩进错误，第一次使用stackexchange的家伙。）

Answer 1

DecisionTreeClassifier确实没有这样的方法

您需要更改：

tree_scores['precision_scores'].append(tree.precision_score(y_test,tree_prediction))
tree_scores['recall_scores'].append(tree.recall_score(y_test,tree_prediction))

至：

tree_scores['precision_scores'].append(precision_score(y_test,tree_prediction))
tree_scores['recall_scores'].append(recall_score(y_test,tree_prediction))

你可以走了

AttributeError: 'DecisionTreeClassifier' object has no attribute 'precision_score'

AttributeError: 'DecisionTreeClassifier' object has no attribute 'precision_score'

python

decision-tree

attributeerror

scikit-learn

precision-recall