kmath/kmath-nd4j/README.md
2021-11-16 14:03:12 +07:00

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# Module kmath-nd4j
ND4J based implementations of KMath abstractions.
- [nd4jarraystructure](#) : NDStructure wrapper for INDArray
- [nd4jarrayrings](#) : Rings over Nd4jArrayStructure of Int and Long
- [nd4jarrayfields](#) : Fields over Nd4jArrayStructure of Float and Double
## Artifact:
The Maven coordinates of this project are `space.kscience:kmath-nd4j:0.3.0-dev-17`.
**Gradle:**
```gradle
repositories {
maven { url 'https://repo.kotlin.link' }
mavenCentral()
}
dependencies {
implementation 'space.kscience:kmath-nd4j:0.3.0-dev-17'
}
```
**Gradle Kotlin DSL:**
```kotlin
repositories {
maven("https://repo.kotlin.link")
mavenCentral()
}
dependencies {
implementation("space.kscience:kmath-nd4j:0.3.0-dev-17")
}
```
## 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).asDoubleStructure()
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 = DoubleNd4jArrayField(intArrayOf(2, 2))
val array = Nd4j.rand(2, 2).asDoubleStructure()
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).