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? Generally speaking, the factory mode is suitable: whenever a large number of products need to be created and have a common interface, they can be created through the factory method mode. Of the above three modes, the first cannot create the object correctly if the incoming string is wrong, and the third does not need to instantiate the chemical factory class compared with the second, so in most cases, we will choose the third-static factory method mode. ?我看见了它，还没端弓，它就溜得没影了。伤痛之下，必不惜一切代价、不择一切手段，也要替公主报仇。Reference: Baidu Encyclopedia-DNFWhen I heard this, I coughed gently and motioned for his words to be a bit off the topic. Wang Zeduan was embarrassed at first. Looking at his expression, he did feel that what he said had nothing to do with the topic, but then he smiled and didn't care, but went on to say:-Coding: N categories are divided M times, and one part of the categories is divided into positive classes and the other part is divided into negative classes in each division, thus forming a two-classification training set. In this way, a total of M training sets are generated, and M classifiers can be trained.