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问题解答:
首先需要解决的问题是将数字标签转化为类别名称。可以使用LabelEncoder的inverse_transform方法实现。
具体步骤如下:
- 导入LabelEncoder和LogisticRegression:
from sklearn.preprocessing import LabelEncoder
from sklearn.linear_model import LogisticRegression
- 对训练集的标签进行数字化处理:
le = LabelEncoder()
y_train = le.fit_transform(y_train)
- 训练逻辑回归模型并预测测试集结果:
clf = LogisticRegression()
clf.fit(X_train, y_train)
y_pred = clf.predict(X_test)
- 将数字标签转换为类别名称:
y_pred = le.inverse_transform(y_pred)
- 构造提交表格并上传至kaggle进行测试。 下面是一个例子:
import pandas as pd
from sklearn.preprocessing import LabelEncoder
from sklearn.linear_model import LogisticRegression
# 加载数据
train_data = pd.read_csv('train.csv')
test_data = pd.read_csv('test.csv')
# 处理数据
X_train = train_data.drop(['id', 'target'], axis=1)
y_train = train_data['target']
X_test = test_data.drop('id', axis=1)
# 标签数字化
le = LabelEncoder()
y_train = le.fit_transform(y_train)
# 训练模型
clf = LogisticRegression()
clf.fit(X_train, y_train)
# 预测结果
y_pred = clf.predict(X_test)
# 数字标签转为类别名称
y_pred = le.inverse_transform(y_pred)
# 构造提交表格
submission = pd.DataFrame({'id': test_data['id'], 'target': y_pred})
# 上传至kaggle测试
submission.to_csv('submission.csv', index=False)