網上通用的解釋：

stacking是k折交叉驗證，元模型的訓練數據等同于基于模型的訓練數據，該方法為每個樣本都生成了元特征，每生成元特征的模型不一樣（k是多少，每個模型的數量就是多少）；測試集生成元特征時，需要用到k（k fold不是模型）個加權平均；

blending是holdout方法，直接將訓練集切割成兩個部分，僅10%用于元模型的訓練；

暫時先用這個方法來區分吧

再來看quora上的回答：

?

Stacking and Blending are two similar approaches of combining classifiers (ensembling).

First at all, let me refer you to this?Kaggle Ensembling Guide. I believe it is very simple and easy to understand (easier than the paper).

The difference is that Stacking uses out-of-fold predictions for the train set, and Blending uses a validation set (let’s say, 10% of the training set) to train the next layer.

Ensembling

Ensembling approaches train several classifiers in the hope that combining their predictions will outperform any single classifier (worst case scenario, be better than the worse classifier). The combination rule can be: majority vote, mean, max, min, product … the average rule is the most used.

Blending and Stacking

As said before, blending and stacking are two very similar approaches. In fact, some people use the terms as synonyms. Such approaches train a first layer of classifiers and use their outputs (i.e. probabilities) to train a second layer of classifiers. Any number of layers can be used. The final prediction is usually performed by the average rule or by a final base classifier (such as Logistic Regression in binary classification).

Figure from?Kaggle Ensembling Guide

You can’t (or shouldn’t) use the training set itself to pass to the next layer. For this reason, there are rules such as using cross-fold-validation (the out-of-fold is used to train the next layer) -?Stacking?- or using a holdout validation (part of the train is used in the first layer, part in the second …) -?Blending.

Keep in Mind

Keep in mind that, even though the examples from?Kaggle Ensembling Guideshows the same base classifiers (XGB) several times, the classifiers must be diverse enough in order for ensembling to produce good results. This might be accomplished by using different base classifiers, training using different features, training using different parts of the training set, or using different parameters.

再來看CSDN解釋：

?csdn部分內容轉載自：https://blog.csdn.net/maqunfi/article/details/82220115

再來看一張非常美麗的圖：
?

轉載自：https://blog.csdn.net/weixin_38526306/article/details/81356325?

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