Book Image

Natural Language Processing with Flair

By : Tadej Magajna
Book Image

Natural Language Processing with Flair

By: Tadej Magajna

Overview of this book

Flair is an easy-to-understand natural language processing (NLP) framework designed to facilitate training and distribution of state-of-the-art NLP models for named entity recognition, part-of-speech tagging, and text classification. Flair is also a text embedding library for combining different types of embeddings, such as document embeddings, Transformer embeddings, and the proposed Flair embeddings. Natural Language Processing with Flair takes a hands-on approach to explaining and solving real-world NLP problems. You'll begin by installing Flair and learning about the basic NLP concepts and terminology. You will explore Flair's extensive features, such as sequence tagging, text classification, and word embeddings, through practical exercises. As you advance, you will train your own sequence labeling and text classification models and learn how to use hyperparameter tuning in order to choose the right training parameters. You will learn about the idea behind one-shot and few-shot learning through a novel text classification technique TARS. Finally, you will solve several real-world NLP problems through hands-on exercises, as well as learn how to deploy Flair models to production. By the end of this Flair book, you'll have developed a thorough understanding of typical NLP problems and you’ll be able to solve them with Flair.
Table of Contents (15 chapters)
1
Part 1: Understanding and Solving NLP with Flair
6
Part 2: Deep Dive into Flair – Training Custom Models
11
Part 3: Real-World Applications with Flair

Chapter 6: Hyperparameter Optimization in Flair

Grasping the concept of sequence tagging and getting a basic understanding of how it works generally isn't a huge problem. What isn't as straightforward is understanding all the parameters that govern model training and choosing the values that yield desired results. A special technique called hyperparameter optimization (also called hyperparameter tuning) helps us achieve that.

We will start with providing a general overview of what hyperparameter tuning is, why it's useful, and what different optimization methods are out there. We'll then dive into how to do tuning in Python with the Hyperopt library. We will conclude the chapter with a hands-on exercise where we will find the optimal hyperparameters for a Part-of-Speech (POS) tagger in Flair.

In this chapter, we will cover hyperparameter optimization in Flair as part of the following sections:

  • Understanding hyperparameter tuning
  • Hyperparameter...