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那就好。It is easy to see that OvR only needs to train N classifiers, while OvO needs to train N (N-1)/2 classifiers, so the storage overhead and test time overhead of OvO are usually larger than OvR. However, in training, each classifier of OVR uses all training samples, while each classifier of OVO only uses samples of two classes. Therefore, when there are many classes, the training time cost of OVO is usually smaller than that of OVR. As for the prediction performance, it depends on the specific data distribution, which is similar in most cases.The oil seller was not surprised. Kang Sugong asked, "Do you know archery? Don't I shoot well?" The old man said, "Nothing special, it's just practice makes perfect." After hearing this, Kang Sugong changed his face and said angrily, "Why do you despise my archery ability??" The old man said, "I can understand this truth from my experience in pouring oil." So the old man took a gourd and put it on the ground, covered it with copper coins, and slowly injected the oil into the gourd with a ladle. The oil was injected from the square hole of the copper coins without touching a drop. The old man said lightly, "I have no special secret either, but practice makes perfect." After hearing this, Chen Yaozi had to send the old man away with a smile.黎水气自己道：是，我真是好心没好报。(1) The author of this novel: Xiaoyao de's latest masterpiece: Death Homework, uploaded by female literature netizens!