Book Image

Modern Scala Projects

By : Ilango gurusamy
Book Image

Modern Scala Projects

By: Ilango gurusamy

Overview of this book

Scala is both a functional programming and object-oriented programming language designed to express common programming patterns in a concise, readable, and type-safe way. Complete with step-by-step instructions, Modern Scala Projects will guide you in exploring Scala capabilities and learning best practices. Along the way, you'll build applications for professional contexts while understanding the core tasks and components. You’ll begin with a project for predicting the class of a flower by implementing a simple machine learning model. Next, you'll create a cancer diagnosis classification pipeline, followed by tackling projects delving into stock price prediction, spam filtering, fraud detection, and a recommendation engine. The focus will be on application of ML techniques that classify data and make predictions, with an emphasis on automating data workflows with the Spark ML pipeline API. The book also showcases the best of Scala’s functional libraries and other constructs to help you roll out your own scalable data processing frameworks. By the end of this Scala book, you’ll have a firm foundation in Scala programming and have built some interesting real-world projects to add to your portfolio.
Table of Contents (14 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Summary


In this chapter, we learned how to implement a binary classification task using two approaches such as, an ML pipeline using the Random Forest algorithm and an secondly using the logistic regression method. 

Both pipelines combined several stages of data analysis into one workflow. In both pipelines, we calculated metrics to give us an estimate of how well our classifier performed. Early on in our data analysis task, we introduced a data preprocessing step to get rid of rows that were missing attribute values that were filled in by a placeholder, ?. With 16 rows of unavailable attribute values eliminated and 683 rows with attribute values still available, we constructed a new DataFrame.

 

In each pipeline, we also created training, training, and validation datasets, followed by a training phase where we fit the models on training data. As with every ML task, the classifier may learn by rotating the training set details, a preponderant phenomenon called overfitting. We got around this...