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Author: bogdani

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Classification Performance Metrics

Throughout this blog, we seek to obtain good performance on our classification tasks. Classification is one of the most popular tasks in Machine Learning. Be sure you understand what classification is before going through this tutorial. You can check this Introduction to Machine Learning, specially created for hackers.

Natural Language Processing - Introduction

What is Natural Language Processing?

This is probably the first post I should have written on the blog. The thing is, I did machine learning and natural language processing for a long time before putting the concepts in order inside my own mind. I’ve learned techniques and hacks to boost precision of classifiers before fully understanding how a classifier computes […]

Training a NER System Using a Large Dataset

In a previous article, we studied training a NER (Named-Entity-Recognition) system from the ground up, using the Groningen Meaning Bank Corpus. This article is a continuation of that tutorial. The main purpose of this extension to training a NER is to: Replace the classifier with a Scikit-Learn Classifier Train a NER on a larger subset […]

natural language processing pipeline

Building a NLP pipeline in NLTK

If you have been working with NLTK for some time now, you probably find the task of preprocessing the text a bit cumbersome. In this post, I will walk you through a simple and fun approach for performing repetitive tasks using coroutines. The coroutines concept is a pretty obscure one but very useful indeed. You […]

text chunking

Text Chunking with NLTK

What is chunking Text chunking, also referred to as shallow parsing, is a task that follows Part-Of-Speech Tagging and that adds more structure to the sentence. The result is a grouping of the words in “chunks”. Here’s a quick example:

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