Whatlanggo

Natural language detection for Go.

Features

Supports 84 languages
100% written in Go
No external dependencies
Fast
Recognizes not only a language, but also a script (Latin, Cyrillic, etc)

Getting started

Installation:

    go get -u github.com/abadojack/whatlanggo

Simple usage example:

package main

import (
	"fmt"
	"github.com/abadojack/whatlanggo"
)

func main() {
	info := whatlanggo.Detect("Foje funkcias kaj foje ne funkcias")
	fmt.Println("Language:", whatlanggo.LangToString(info.Lang), " Script:", whatlanggo.Scripts[info.Script], " Confidence: ", info.Confidence)
}

Blacklisting and whitelisting

import "github.com/abadojack/whatlanggo"

//Blacklist
options := whatlanggo.Options{
	Blacklist: map[whatlanggo.Lang]bool{
		whatlanggo.Ydd: true,
	},
}

info := whatlanggo.DetectWithOptions("האקדמיה ללשון העברית", options)

fmt.Println("Language:", whatlanggo.LangToString(info.Lang), "Script:", whatlanggo.Scripts[info.Script])

//Whitelist
options1 := whatlanggo.Options{
	Whitelist: map[whatlanggo.Lang]bool{
		whatlanggo.Epo: true,
		whatlanggo.Ukr: true,
	},
}

info = whatlanggo.DetectWithOptions("Mi ne scias", options1)
fmt.Println("Language:", whatlanggo.LangToString(info.Lang), "Script:", whatlanggo.Scripts[info.Script])

For more details, please check the documentation.

Requirements

Go 1.8 or higher

How does it work?

How does the language recognition work?

The algorithm is based on the trigram language models, which is a particular case of n-grams. To understand the idea, please check the original whitepaper Cavnar and Trenkle '94: N-Gram-Based Text Categorization'.

How IsReliable calculated?

It is based on the following factors:

How many unique trigrams are in the given text
How big is the difference between the first and the second(not returned) detected languages? This metric is called rate in the code base.

Therefore, it can be presented as 2d space with threshold functions, that splits it into "Reliable" and "Not reliable" areas. This function is a hyperbola and it looks like the following one:

For more details, please check a blog article Introduction to Rust Whatlang Library and Natural Language Identification Algorithms.

License

MIT

Derivation

whatlanggo is a derivative of Franc (JavaScript, MIT) by Titus Wormer.

Acknowledgements

Thanks to greyblake (Potapov Sergey) for creating whatlang-rs from where I got the idea and algorithms.

g7r / whatlanggo