LSH.jl: Locality Sensitive Hashing

LSH

Installation

This package requires julia version 0.4 which is currently under development. See http://julialang.org/downloads/ for instructions on how to download a latest nightly release for all major platforms.

After installing julia, this package can be installed with:

Pkg.clone("https://github.com/Keno/LSH.jl")
# This is currently needed while changes to DataStructures.jl are awaiting upstreaming
Pkg.checkout("DataStructures","kf/lsh")

API

LSHTable

The main entry point to this package is the LSHTable struct, which can be constructed as

T = LSHTable(R,hashes,data; progress=true)

where R is the desired query radius, i.e. the R in an R-NN data structure, hashes is an array of locality sensitive hash function (see below for how to create these) and data is the data set to be added to the locality sensitive hash table. data can be specified either as a Vector of vectors, with each contained vector representing a data point, or as a matrix with the coordinates of the points given by the rows of the matrix.

The data structure can be queried via it's getindex method:

found_points = T[q]

where q is the coordinate vector of query points and found_points is the list of found points.

Hashes

Currently this package supports two kinds of hash functions, both as defined in [AM04]. Both kinds are made up of tuples of hash functions based on p-stable distributions, though the first method (dubbed g-functions) requires O(kdL) compute whereas the second method (dubbed u-functions) can be constructed in O(kdm) where m is appriximately sqrt(L). The hash arrays can be constructed using:

hashesg = createHashesAM04(d,w,k,L,R) # Create g functions with the given parameters
hashesu = createUHashesAM04(d,w,k,L,R) # Create u functions with the given parameters

Download Details:

Author: Keno
Source Code: https://github.com/Keno/LSH.jl 
License: View license

#julia #hash 

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LSH.jl: Locality Sensitive Hashing

LSH

Installation

This package requires julia version 0.4 which is currently under development. See http://julialang.org/downloads/ for instructions on how to download a latest nightly release for all major platforms.

After installing julia, this package can be installed with:

Pkg.clone("https://github.com/Keno/LSH.jl")
# This is currently needed while changes to DataStructures.jl are awaiting upstreaming
Pkg.checkout("DataStructures","kf/lsh")

API

LSHTable

The main entry point to this package is the LSHTable struct, which can be constructed as

T = LSHTable(R,hashes,data; progress=true)

where R is the desired query radius, i.e. the R in an R-NN data structure, hashes is an array of locality sensitive hash function (see below for how to create these) and data is the data set to be added to the locality sensitive hash table. data can be specified either as a Vector of vectors, with each contained vector representing a data point, or as a matrix with the coordinates of the points given by the rows of the matrix.

The data structure can be queried via it's getindex method:

found_points = T[q]

where q is the coordinate vector of query points and found_points is the list of found points.

Hashes

Currently this package supports two kinds of hash functions, both as defined in [AM04]. Both kinds are made up of tuples of hash functions based on p-stable distributions, though the first method (dubbed g-functions) requires O(kdL) compute whereas the second method (dubbed u-functions) can be constructed in O(kdm) where m is appriximately sqrt(L). The hash arrays can be constructed using:

hashesg = createHashesAM04(d,w,k,L,R) # Create g functions with the given parameters
hashesu = createUHashesAM04(d,w,k,L,R) # Create u functions with the given parameters

Download Details:

Author: Keno
Source Code: https://github.com/Keno/LSH.jl 
License: View license

#julia #hash 

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Lingo-Vapor: Vapor Provider for Lingo - The Swift Localization Library

Lingo Provider

A Vapor provider for Lingo - a pure Swift localization library ready to be used in Server Side Swift projects.

Setup

Add a dependancy

Add LingoProvider as a dependancy in your Package.swift file:

dependencies: [
    ...,
    .package(name: "LingoVapor", url: "https://github.com/vapor-community/Lingo-Vapor.git", from: "4.2.0")]
],
targets: [
    .target(name: "App", dependencies: [
        .product(name: "LingoVapor", package: "Lingo-Vapor")

Upgrading from version 4.1.0 to version 4.2.0

The version 4.1.0 uses the new version of Lingo where the format of locale identifiers was changed to match RFC 5646. Prior to 4.2.0 _ was used to separate language code and country code in the locale identifier, and now the library uses - as per RFC.

If you were using any locales which include a country code, you would need to rename related translation files to match the new format.

Add the Provider

In the configure.swift simply initialize the LingoVapor with a default locale:

import LingoVapor
...
public func configure(_ app: Application) throws {
    ...
    app.lingoVapor.configuration = .init(defaultLocale: "en", localizationsDir: "Localizations")
}

The localizationsDir can be omitted, as the Localizations is also the default path. Note that this folder should exist under the workDir.

Use

After you have configured the provider, you can use lingoVapor service to create Lingo:

let lingo = try app.lingoVapor.lingo()
...
let localizedTitle = lingo.localize("welcome.title", locale: "en")

To get the locale of a user out of the request, you can use request.locale. This uses a language, which is in the HTTP header and which is in your available locales, if that exists. Otherwise it falls back to the default locale. Now you can use different locales dynamically:

let localizedTitle = lingo.localize("welcome.title", locale: request.locale)

When overwriting the requested locale, just write the new locale into the session, e.g. like that:

session.data["locale"] = locale

Use the following syntax for defining localizations in a JSON file:

{
    "title": "Hello Swift!",
    "greeting.message": "Hi %{full-name}!",
    "unread.messages": {
        "one": "You have one unread message.",
        "other": "You have %{count} unread messages."
    }
}

Locale redirection middleware

In case you want to serv different locales on different subfolders, you can use the LocaleRedirectMiddleware.

Add in configure.swift:

import LingoVapor

// Inside `configure(_ app: Application)`:
app.middleware.use(LocaleRedirectMiddleware())

Add in routes.swift:

import LingoVapor

// Inside `routes(_ app: Application)`:
app.get("home") { /* ... */ }
app.get(":locale", "home") { /* ... */ } // For each route, add the one prefixed by the `locale` parameter

That way, going to /home/ will redirect you to /<locale>/home/ (with <locale> corresponding to your browser locale), and going to /fr/home/ will display homepage in french whatever the browser locale is.

Inside Leaf templates

When using Leaf as templating engine, you can use LocalizeTag, LocaleTag and LocaleLinksTag from LingoVaporLeaf for localization inside the templates.

Add in configure.swift:

import LingoVaporLeaf

// Inside `configure(_ app: Application)`:
app.leaf.tags["localize"] = LocalizeTag()
app.leaf.tags["locale"] = LocaleTag()
app.leaf.tags["localeLinks"] = LocaleLinksTag()

Afterwards you can call them inside the Leaf templates:

<!-- String localization -->
#localize("thisisthelingokey")
#localize("lingokeywithvariable", "{\"foo\":\"bar\"}")

<!-- Get current locale -->
<html lang="#locale()">

<!-- Generate link canonical and alternate tags -->
#localeLinks("http://example.com/", "/canonical/path/")

Learn more

• Lingo - learn more about the localization file format, pluralization support, and see how you can get the most out of the Lingo.

Download Details:

Author: Vapor-community
Source Code: https://github.com/vapor-community/Lingo-Vapor 
License: MIT license

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