We learned that in order to create a good classification tree model, we need to have an existing data set with known output from which we can build our model.
我们了解了为了创建一个好的分类树模型，我们必须要有一个输出已知的现有数据集，从这个数据集才能构建我们的模型。
When you define a classification system, take in account all stakeholders' opinions and try to have a consistent approach to categorizing data, even through the many challenges.
您定义分类系统时，考虑所有涉众的观点，试图找到一致的方法来组织数据，但是困难重重。
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