python 类型错误：python TypeError: ufunc ‘subtract‘ did not contain a loop with signature matching types

报错类型

python TypeError: ufunc ‘subtract’ did not contain a loop with signature matching types dtype(‘S32’)

解决方法

原代码：

y = df['target']
X = df.drop('target', axis=1)

修改后的代码：

y = df['target'].values
X = df.drop('target', axis=1).values