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Python: Learning about defaultdict’s handling of missing keys

While reading the scikit-learn code I came across a bit of code that I didn’t understand for a while but in retrospect is quite neat. This is the code snippet that intrigued me: vocabulary = defaultdict() vocabulary.default_factory = vocabulary.__len__ Let’s quickly see how it works by adapting an example from scikit-learn: >>> from collections import defaultdict >>> vocabulary = defaultdict() ...

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Python: Combinations of values on and off

In my continued exploration of Kaggle’s Spooky Authors competition, I wanted to run a GridSearch turning on and off different classifiers to work out the best combination. I therefore needed to generate combinations of 1s and 0s enabling different classifiers. e.g. if we had 3 classifiers we’d generate these combinations 0 0 1 0 1 0 1 0 0 1 ...

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CSS Horizontal Line Styling Example

1. Introduction In any web page or blog post, it is usually a good practice to identify and divide elements and sections which are logically separate. You could use HTML elements like div for encapsulating multiple page elements, ul and ol for organizing lengthy text into a more readable list-based format, or simply use hr to create a horizontal line. ...

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scikit-learn: Creating a matrix of named entity counts

I’ve been trying to improve my score on Kaggle’s Spooky Author Identification competition, and my latest idea was building a model which used named entities extracted using the polyglot NLP library. We’ll start by learning how to extract entities form a sentence using polyglot which isn’t too tricky: >>> from polyglot.text import Text >>> doc = "My name is David ...

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HTML5 Text Editor Example

In this post, we will take a look at the implementation of an In-browser text editor. The editor will provide basic editing functionality like making the text bold, italic, underline, strikeout and indentation, alignment of blocks of text. A text editor provides useful functionality that can be leveraged in blog comments section apart from other kinds of websites. 1. Introduction ...

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Python: polyglot – ModuleNotFoundError: No module named ‘icu’

I wanted to use the polyglot NLP library that my colleague Will Lyon mentioned in his analysis of Russian Twitter Trolls but had installation problems which I thought I’d share in case anyone else experiences the same issues. I started by trying to install polyglot: $ pip install polyglot   ImportError: No module named 'icu' Hmmm I’m not sure what ...

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Secure Your Node.js Website with OpenID Connect

“I love writing authentication and authorization code.” ~ No Web Developer Ever. Tired of building the same login screens over and over? Try the Okta API for hosted authentication, authorization, and multi-factor auth. User authentication in Node can be confusing. It’s confusing for lots of people, including really talented Node developers, so you’re not alone. Authentication practices change frequently and ...

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