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--------------------------------Return new MyIterator (this);-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.15 million pairs. Stance has attracted many athletic talents, street filmmakers, hardcore musicians and NBA players.Then he waited long enough to forget not only how the sentences in the original article were worded, but also the order of those words.The execution results are consistent with the previous code, but the benefits of using the state mode are obvious. It can localize the relationship between each state and its corresponding behaviors, which are scattered and encapsulated in their corresponding state classes, making it easy to read and manage the code. In addition, the switching between states is distributed within the state class, which makes it unnecessary to write too many if, else conditional branch languages to control the switching between states.