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。

youdao

It provides a core data model and a very rich set of functions and primitives for flexible query.

它提供核心数据模型以及一组非常丰富的用于灵活查询的函数和原语。

youdao

This takes a data set with known output values and USES this data set to build our model.

就是拿一组输出值已知的数据集并使用此数据集来创建我们的模型。

youdao

In other words, even with an absurdly small cherry picked data set laid on top of them, every model got it right.

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But if one looks at a much more robust set of data based on a much wider variety of countries, one gets both a model with much better fit, and with a very different message.

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