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Implement the ND4J module for scalars

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Commander Tvis 2020-06-11 14:10:39 +07:00
parent f364060acf
commit 3df9892de5
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4 changed files with 42 additions and 2 deletions
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1
build.gradle.kts
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@ -11,6 +11,7 @@ allprojects {
repositories {
jcenter()
maven("https://dl.bintray.com/kotlin/kotlinx")
mavenCentral()
}
group = "scientifik"

10
kmath-nd4j/build.gradle.kts
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@ -1,3 +1,9 @@
plugins {
id("scientifik.jvm")
plugins { id("scientifik.jvm") }
dependencies {
api(project(":kmath-core"))
api("org.nd4j:nd4j-api:1.0.0-beta7")
testImplementation("org.deeplearning4j:deeplearning4j-core:1.0.0-beta7")
testImplementation("org.nd4j:nd4j-native-platform:1.0.0-beta7")
testImplementation("org.slf4j:slf4j-simple:1.7.30")
}

19
kmath-nd4j/src/main/kotlin/scientifik.kmath.nd4j/INDArrayScalarsIterator.kt Normal file
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@ -0,0 +1,19 @@
package scientifik.kmath.nd4j
import org.nd4j.linalg.api.ndarray.INDArray
import org.nd4j.linalg.api.shape.Shape
internal class INDArrayScalarsIterator(private val iterateOver: INDArray) : Iterator<Pair<IntArray, INDArray>> {
private var i: Int = 0
override fun hasNext(): Boolean = i < iterateOver.length()
override fun next(): Pair<IntArray, INDArray> {
val idx = if (iterateOver.ordering() == 'c')
Shape.ind2subC(iterateOver, i++.toLong())!!
else
Shape.ind2sub(iterateOver, i++.toLong())!!
return narrowToIntArray(idx) to iterateOver.getScalar(*idx)
}
}

14
kmath-nd4j/src/main/kotlin/scientifik.kmath.nd4j/ND4JStructure.kt Normal file
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@ -0,0 +1,14 @@
package scientifik.kmath.nd4j
import org.nd4j.linalg.api.ndarray.INDArray
import scientifik.kmath.structures.NDStructure
internal fun narrowToIntArray(la: LongArray): IntArray = IntArray(la.size) { la[it].toInt() }
data class ND4JStructure<T>(val ndArray: INDArray) : NDStructure<INDArray> {
override val shape: IntArray
get() = narrowToIntArray(ndArray.shape())
override fun get(index: IntArray): INDArray = ndArray.getScalar(*index)
override fun elements(): Sequence<Pair<IntArray, INDArray>> = Sequence { INDArrayScalarsIterator(ndArray) }
}