80 lines
2.2 KiB
Markdown
80 lines
2.2 KiB
Markdown
# ND4J NDStructure implementation (`kmath-nd4j`)
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This subproject implements the following features:
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- [nd4jarraystructure](#) : NDStructure wrapper for INDArray
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- [nd4jarrayrings](#) : Rings over Nd4jArrayStructure of Int and Long
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- [nd4jarrayfields](#) : Fields over Nd4jArrayStructure of Float and Double
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> #### Artifact:
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>
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> This module artifact: `space.kscience:kmath-nd4j:0.3.0-dev-3`.
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>
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> Bintray release version: [  ](https://bintray.com/mipt-npm/kscience/kmath-nd4j/_latestVersion)
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>
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> Bintray development version: [  ](https://bintray.com/mipt-npm/dev/kmath-nd4j/_latestVersion)
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>
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> **Gradle:**
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>
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> ```gradle
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> repositories {
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> maven { url 'https://repo.kotlin.link' }
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> maven { url 'https://dl.bintray.com/hotkeytlt/maven' }
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> maven { url "https://dl.bintray.com/kotlin/kotlin-eap" } // include for builds based on kotlin-eap
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> }
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>
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> dependencies {
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> implementation 'space.kscience:kmath-nd4j:0.3.0-dev-3'
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> }
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> ```
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> **Gradle Kotlin DSL:**
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>
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> ```kotlin
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> repositories {
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> maven("https://repo.kotlin.link")
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> maven("https://dl.bintray.com/kotlin/kotlin-eap") // include for builds based on kotlin-eap
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> maven("https://dl.bintray.com/hotkeytlt/maven") // required for a
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> }
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>
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> dependencies {
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> implementation("space.kscience:kmath-nd4j:0.3.0-dev-3")
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> }
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> ```
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## Examples
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NDStructure wrapper for INDArray:
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```kotlin
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import org.nd4j.linalg.factory.*
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import scientifik.kmath.nd4j.*
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import scientifik.kmath.structures.*
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val array = Nd4j.ones(2, 2).asDoubleStructure()
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println(array[0, 0]) // 1.0
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array[intArrayOf(0, 0)] = 24.0
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println(array[0, 0]) // 24.0
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```
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Fast element-wise and in-place arithmetics for INDArray:
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```kotlin
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import org.nd4j.linalg.factory.*
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import scientifik.kmath.nd4j.*
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import scientifik.kmath.operations.*
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val field = DoubleNd4jArrayField(intArrayOf(2, 2))
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val array = Nd4j.rand(2, 2).asDoubleStructure()
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val res = field {
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(25.0 / array + 20) * 4
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}
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println(res.ndArray)
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// [[ 250.6449, 428.5840],
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// [ 269.7913, 202.2077]]
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```
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Contributed by [Iaroslav Postovalov](https://github.com/CommanderTvis).
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