81 lines
2.0 KiB
Markdown
81 lines
2.0 KiB
Markdown
# ND4J NDStructure implementation (`kmath-nd4j`)
|
|
|
|
This subproject implements the following features:
|
|
|
|
- NDStructure wrapper for INDArray.
|
|
- Optimized NDRing implementations for INDArray storing Ints and Longs.
|
|
- Optimized NDField implementations for INDArray storing Floats and Doubles.
|
|
|
|
> #### Artifact:
|
|
> This module is distributed in the artifact `scientifik:kmath-nd4j:0.1.4-dev-8`.
|
|
>
|
|
> **Gradle:**
|
|
>
|
|
> ```gradle
|
|
> repositories {
|
|
> mavenCentral()
|
|
> maven { url 'https://dl.bintray.com/mipt-npm/scientifik' }
|
|
> maven { url 'https://dl.bintray.com/mipt-npm/dev' }
|
|
> }
|
|
>
|
|
> dependencies {
|
|
> implementation 'scientifik:kmath-nd4j:0.1.4-dev-8'
|
|
> implementation 'org.nd4j:nd4j-native-platform:1.0.0-beta7'
|
|
> }
|
|
> ```
|
|
> **Gradle Kotlin DSL:**
|
|
>
|
|
> ```kotlin
|
|
> repositories {
|
|
> mavenCentral()
|
|
> maven("https://dl.bintray.com/mipt-npm/scientifik")
|
|
> maven("https://dl.bintray.com/mipt-npm/dev")
|
|
> }
|
|
>
|
|
> dependencies {
|
|
> implementation("scientifik:kmath-nd4j:0.1.4-dev-8")
|
|
> implementation("org.nd4j:nd4j-native-platform:1.0.0-beta7")
|
|
> }
|
|
> ```
|
|
>
|
|
> This distribution also needs an implementation of ND4J API. The ND4J Native Platform is usually the fastest one, so
|
|
> it is included to the snippet.
|
|
>
|
|
|
|
## Examples
|
|
|
|
NDStructure wrapper for INDArray:
|
|
|
|
```kotlin
|
|
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:
|
|
|
|
```kotlin
|
|
import org.nd4j.linalg.factory.*
|
|
import scientifik.kmath.nd4j.*
|
|
import scientifik.kmath.operations.*
|
|
|
|
val field = RealINDArrayField(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](https://github.com/CommanderTvis).
|