3. You recently built three machine learning models to perform a classification task and found that the models have the ROC curves shown in Figure 9.18.

a. Which model performs the best against your data?

b. How would you choose between models A and C?

improving the performance of a machine learning model. The techniques we discuss will be based on two main approaches. The first approach is focused on improving performance by optimizing a single model, while the second approach is focused on leveraging the power of several suboptimal models to improve performance.
By the end of this chapter, you will have learned the following:
◆◆ How to improve performance by tuning the parameters of a single machine learning model to make it better ◆◆ How to improve performance by bringing several weak machine learning models together to create a more powerful unit