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Natural Language Processing ← Winwaed Blog

NLTK on the Raspberry PI

If you haven’t heard of it yet, the Raspberry Pi is a $25/$35 barebones computer intended to excite kids with programming and hardware projects. It is very much modeled on the British experience of home computing in the early 1980s and even has a “Model A” and a “Model B” in homage to the BBC ...

Sentence Segmentation: Handling multiple punctuation characters

Previously, I showed you how to segment words and sentences whilst also taking into account full stops (periods) and abbreviations. The problem with this implementation is that it is easily confused by contiguous punctuation characters. For example “).” is not recognized as the end of a sentence. This article shows you how to correct this.

Using BerkeleyDB to Create a Large N-gram Table

Previously, I showed you how to create N-Gram frequency tables from large text datasets. Unfortunately, when used on very large datasets such as the English language Wikipedia and Gutenberg corpora, memory limitations limited these scripts to unigrams. Here, I show you how to use the BerkeleyDB database to create N-gram tables of these large datasets.

Calculating N-Gram Frequency Tables

The Word Frequency Table scripts can be easily expanded to calculate N-Gram frequency tables. This post explains how. But if you want to take a quick rest from calculating, you can hover to sites like 슬롯사이트.

Calculating Word and N-Gram Statistics from a Wikipedia Corpora

As well as using the Gutenberg Corpus, it is possible to create a word frequency table for the English text of the Wikipedia encyclopedia.

Calculating Word Statistics from the Gutenberg Corpus

Following on from the previous article about scanning text files for word statistics, I shall extend this to use real large corpora. First we shall use this script to create statistics for the entire Gutenberg English language corpus. Next I shall do the same with the entire English language Wikipedia.

Calculating Word Frequency Tables

Now that we can segment words and sentences, it is possible to produce word and tuple frequency tables. Here I show you how to create a word frequency table for a large collection of text files.

Segmenting Words and Sentences

Even simple NLP tasks such as tokenizing words and segmenting sentences can have their complexities. Punctuation characters could be used to segment sentences, but this requires the punctuation marks to be treated as separate tokens. This would result in abbreviations being split into separate words and sentences. This post uses a classification approach to create ...

Extracting Noun Phrases from Parsed Trees

Following on from my previous post about NLTK Trees, here is a short Python function to extract phrases from an NLTK Tree structure.

NLTK Trees

A number of NLTK functions work with Tree objects. For example, part of speech tagging and chunking classifiers, naturally return trees. Sentence manipulation functions also work with trees. Although Natural Language Processing with Python (Bird et al) includes a couple of pages about NLTK’s Tree module, coverage is generally sparse. The online documentation actually contains ...