Pythonで学ぶSentiment Analysis

Have you ever checked the reviews or ratings of a product or a service before you purchased it? Then you have very likely came face-to-face with sentiment analysis. In this chapter, you will learn the basic structure of a sentiment analysis problem and start exploring the sentiment of movie reviews.

Imagine you are in the shoes of a company offering a variety of products. You want to know which of your products are bestsellers and most of all - why. We embark on step 1 of understanding the reviews of products, using a dataset with Amazon product reviews. To that end, we transform the text into a numeric form and consider a few complexities in the process.

This chapter continues the process of understanding product reviews. We will cover additional complexities, especially when working with sentiment analysis data from social media platforms such as Twitter. We will also learn other ways to obtain numeric features from the text.

We employ machine learning to predict the sentiment of a review based on the words used in the review. We use logistic regression and evaluate its performance in a few different ways. These are some solid first models!