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Love your greed love your stubbornnessFor codes of the same length, theoretically, the further the coding distance between any two categories, the stronger the error correction capability. Therefore, when the code length is small, the theoretical optimal code can be calculated according to this principle. However, it is difficult to effectively determine the optimal code when the code length is slightly larger. In fact, this is an NP-hard problem. However, we usually do not need to obtain theoretical optimal codes, because non-optimal codes can often produce good enough classifiers in practice. On the other hand, it is not that the better the theoretical properties of coding, the better the classification performance, because the machine learning problem involves many factors, such as dismantling multiple classes into two "class subsets", and the difficulty of distinguishing the two class subsets formed by different dismantling methods is often different, that is, the difficulty of the two classification problems caused by them is different. Therefore, one theory has a good quality of error correction, but it leads to a difficult coding for the two-classification problem, which is worse than the other theory, but it leads to a simpler coding for the two-classification problem, and it is hard to say which is better or weaker in the final performance of the model.板栗犹豫了一下，便在她身前坐下，将她的腿抱在怀里推拿揉捏，同时微微后仰身子，方便她为自己梳头。望着床上那个面色黝黑、皮肤粗糙的农妇，两人都不敢相信自己的眼睛，一齐泪流满面——实在是难以跟记忆中的姑姑（娘）对上。　　本来，“单身父亲”已经日子艰难，不料，节外生枝，一个寡妇又将三个孩子丢给他。一个奶爸，4个娃娃，生活更加艰难。一句承诺，30年的守候，何等感人！　三个孩子被拐卖、小女儿患不治之症，未婚爸爸不离不弃，情浓于血，义重于山。他家的娃儿都是用果子和菜来取名儿的，很好认，那就是我家了。