使用sklearn分割后，如何重新合并X_test和y_test以及x_train和y_train？

Question

所以我想在将它们拆分（使用分层）后对Train＆test Dataset进行均值目标编码，并且要这样做，必须将它们重新合并在一起。

我该怎么做？任何建议将不胜感激？ ，谢谢U。

   X_train, X_test, y_train, y_test = train_test_split(R,
                                                target,
                                                test_size=0.25,
                                                random_state=7,
                                                stratify=target)  
   print("Number transactions X_train dataset: ", X_train.shape)
   print("Number transactions y_train dataset: ", y_train.shape)
   print("Number transactions X_test dataset: ", X_test.shape)
   print("Number transactions y_test dataset: ", y_test.shape)

以下是输出：

   Number transactions X_train dataset:  (37779, 89)
   Number transactions y_train dataset:  (37779,)
   Number transactions X_test dataset:  (12593, 89)
   Number transactions y_test dataset:  (12593,)

Answer 1

您可以按行连接数组：

X_combined = np.r_[X_train, X_test]
y_combined = np.r_[y_train, y_test]

您可以在other SO问题中看到更多的深度。