kmath/kmath-nd4j/README.md

ND4J NDStructure implementation (kmath-nd4j)

This subproject implements the following features:

• nd4jarraystructure : NDStructure wrapper for INDArray
• nd4jarrayrings : Rings over Nd4jArrayStructure of Int and Long
• nd4jarrayfields : Fields over Nd4jArrayStructure of Float and Double

Artifact:

This module artifact: kscience.kmath:kmath-nd4j:0.2.0-dev-4.

Bintray release version:

Bintray development version:

Gradle:

repositories {
    maven { url "https://dl.bintray.com/kotlin/kotlin-eap" }
    maven { url 'https://dl.bintray.com/mipt-npm/kscience' }
    maven { url 'https://dl.bintray.com/mipt-npm/dev' }
    maven { url 'https://dl.bintray.com/hotkeytlt/maven' }

}

dependencies {
    implementation 'kscience.kmath:kmath-nd4j:0.2.0-dev-4'
}

Gradle Kotlin DSL:

repositories {
    maven("https://dl.bintray.com/kotlin/kotlin-eap")
    maven("https://dl.bintray.com/mipt-npm/kscience")
    maven("https://dl.bintray.com/mipt-npm/dev")
    maven("https://dl.bintray.com/hotkeytlt/maven")
}

dependencies {
    implementation("kscience.kmath:kmath-nd4j:0.2.0-dev-4")
}

Examples

NDStructure wrapper for INDArray:

import org.nd4j.linalg.factory.*
import scientifik.kmath.nd4j.*
import scientifik.kmath.structures.*

val array = Nd4j.ones(2, 2).asRealStructure()
println(array[0, 0]) // 1.0
array[intArrayOf(0, 0)] = 24.0
println(array[0, 0]) // 24.0

Fast element-wise and in-place arithmetics for INDArray:

import org.nd4j.linalg.factory.*
import scientifik.kmath.nd4j.*
import scientifik.kmath.operations.*

val field = RealNd4jArrayField(intArrayOf(2, 2))
val array = Nd4j.rand(2, 2).asRealStructure()

val res = field {
    (25.0 / array + 20) * 4
}

println(res.ndArray)
// [[  250.6449,  428.5840], 
//  [  269.7913,  202.2077]]

Contributed by Iaroslav Postovalov.