ValueError：在实现sklearn时无法将字符串转换为float

Question

我是新来的，我遇到了这样的错误；

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我使用的数据集的形状为（30,216）

 File "C:\Users\Himanshu\Desktop\Project\ML\Pract\mlp1.py", line 268, in 
 <module> cv_results = model_selection.cross_val_score(model, X_train, Y_train, 
 cv=kfold, scoring=scoring)
 File "C:\Users\Himanshu\AppData\Roaming\Python\Python27\site-  
 packages\sklearn\model_selection\_validation.py", line 402, in cross_val_score
 error_score=error_score)
 .
 .
 etc..like above)
 ValueError: could not convert string to float: transact

我想知道，我是否正确分割了它。 有人可以建议为什么发生此错误。

已编辑： 我要添加其余的代码：

array = dataset.values
X = array[:,0:215]
Y = array[:,215]
validation_size = 0.20
seed = 7
X_train, X_validation, Y_train, Y_validation = 
model_selection.train_test_split(X, Y, test_size=validation_size, 
random_state=seed)