Summary
In this chapter, we continued working on the online advertising click-through prediction project. This time, we were able to train the classifier on the entire dataset with millions of records, with the help of the parallel computing tool Apache Spark. We discussed the basics of Spark, including its major components, the deployment of Spark programs, the programming essentials of PySpark, and the Python interface of Spark. Then, we programmed using PySpark to explore the click log data.
You learned how to perform one-hot encoding, cache intermediate results, develop classification solutions based on the entire click log dataset, and evaluate performance. In addition, I introduced two feature engineering techniques, feature hashing and feature interaction, in order to improve prediction performance. We had fun implementing them in PySpark as well.
Looking back on our learning journey, we have been working on classification problems since ...
