Buffer streaming next iteration
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@ -2,6 +2,9 @@ package scientifik.kmath.transform
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import org.apache.commons.math3.transform.*
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import scientifik.kmath.operations.Complex
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import scientifik.kmath.sequential.Processor
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import scientifik.kmath.sequential.Producer
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import scientifik.kmath.sequential.map
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import scientifik.kmath.structures.*
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@ -61,3 +64,23 @@ object Transformations {
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FastHadamardTransformer().transform(it.asArray(), direction).asBuffer()
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}
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}
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/**
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* Process given [Producer] with commons-math fft transformation
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*/
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fun Producer<Buffer<Complex>>.FFT(
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normalization: DftNormalization = DftNormalization.STANDARD,
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direction: TransformType = TransformType.FORWARD
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): Processor<Buffer<Complex>, Buffer<Complex>> {
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val transform = Transformations.fourier(normalization, direction)
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return map { transform(it) }
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}
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@JvmName("realFFT")
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fun Producer<Buffer<Double>>.FFT(
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normalization: DftNormalization = DftNormalization.STANDARD,
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direction: TransformType = TransformType.FORWARD
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): Processor<Buffer<Double>, Buffer<Complex>> {
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val transform = Transformations.realFourier(normalization, direction)
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return map { transform(it) }
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}
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@ -1,178 +1,78 @@
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package scientifik.kmath.sequential
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import kotlinx.atomicfu.atomic
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.GlobalScope
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import kotlinx.coroutines.channels.*
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import kotlinx.coroutines.channels.Channel
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import kotlinx.coroutines.channels.produce
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import kotlinx.coroutines.isActive
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.sync.Mutex
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import kotlinx.coroutines.sync.withLock
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import scientifik.kmath.structures.Buffer
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import scientifik.kmath.structures.asBuffer
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import scientifik.kmath.structures.asSequence
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import scientifik.kmath.structures.BufferFactory
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fun <T> Buffer<T>.asChannel(scope: CoroutineScope): ReceiveChannel<T> = scope.produce {
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for (i in (0 until size)) {
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send(get(i))
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}
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}
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/**
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* A processor that collects incoming elements into fixed size buffers
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*/
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class JoinProcessor<T>(
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scope: CoroutineScope,
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bufferSize: Int,
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bufferFactory: BufferFactory<T> = Buffer.Companion::boxing
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) : AbstractProcessor<T, Buffer<T>>(scope) {
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private val input = Channel<T>(bufferSize)
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interface BufferProducer<T> : Producer<T> {
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suspend fun receiveBuffer(): Buffer<T>
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}
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interface BufferConsumer<T> : Consumer<T> {
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suspend fun sendBuffer(buffer: Buffer<T>)
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}
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abstract class AbstractBufferProducer<T>(scope: CoroutineScope) : AbstractProducer<T>(scope), BufferProducer<T> {
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override fun connectOutput(consumer: Consumer<T>) {
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if (consumer is BufferConsumer) {
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launch {
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while (this.isActive) {
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consumer.sendBuffer(receiveBuffer())
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}
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}
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} else {
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super.connectOutput(consumer)
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}
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}
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}
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abstract class AbstractBufferConsumer<T>(scope: CoroutineScope) : AbstractConsumer<T>(scope), BufferConsumer<T> {
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override fun connectInput(producer: Producer<T>) {
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if (producer is BufferProducer) {
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launch {
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private val output = produce(coroutineContext) {
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val list = ArrayList<T>(bufferSize)
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while (isActive) {
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sendBuffer(producer.receiveBuffer())
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list.clear()
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repeat(bufferSize) {
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list.add(input.receive())
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}
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}
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} else {
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super.connectInput(producer)
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}
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}
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}
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abstract class AbstractBufferProcessor<T, R>(scope: CoroutineScope) :
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AbstractProcessor<T, R>(scope),
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BufferProducer<R>,
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BufferConsumer<T> {
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override fun connectOutput(consumer: Consumer<R>) {
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if (consumer is BufferConsumer) {
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launch {
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while (this.isActive) {
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consumer.sendBuffer(receiveBuffer())
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}
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}
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} else {
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super.connectOutput(consumer)
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val buffer = bufferFactory(bufferSize) { list[it] }
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send(buffer)
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}
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}
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override fun connectInput(producer: Producer<T>) {
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if (producer is BufferProducer) {
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launch {
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while (isActive) {
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sendBuffer(producer.receiveBuffer())
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}
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}
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} else {
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super.connectInput(producer)
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}
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}
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}
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/**
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* The basic generic buffer producer supporting both arrays and element-by-element simultaneously
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*/
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class BasicBufferProducer<T>(
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scope: CoroutineScope,
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capacity: Int = Channel.UNLIMITED,
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block: suspend ProducerScope<Buffer<T>>.() -> Unit
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) : AbstractBufferProducer<T>(scope) {
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private val currentArray = atomic<ReceiveChannel<T>?>(null)
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private val channel: ReceiveChannel<Buffer<T>> by lazy { produce(capacity = capacity, block = block) }
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private val cachingChannel by lazy {
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channel.map {
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it.also { buffer -> currentArray.lazySet(buffer.asChannel(this)) }
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}
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}
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private fun DoubleArray.asChannel() = produce {
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for (value in this@asChannel) {
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send(value)
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}
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}
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override suspend fun receiveBuffer(): Buffer<T> = cachingChannel.receive()
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override suspend fun receive(): T = (currentArray.value ?: cachingChannel.receive().asChannel(this)).receive()
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}
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class BufferReducer<T, S>(
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scope: CoroutineScope,
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initialState: S,
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val fold: suspend (S, Buffer<T>) -> S
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) : AbstractBufferConsumer<T>(scope) {
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var state: S = initialState
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private set
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override suspend fun sendBuffer(buffer: Buffer<T>) {
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state = fold(state, buffer)
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}
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override suspend fun send(value: T) = sendBuffer(arrayOf(value).asBuffer())
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}
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/**
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* Convert a [Buffer] to single element producer, splitting it in chunks if necessary
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*/
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fun <T> Buffer<T>.produce(scope: CoroutineScope = GlobalScope, chunkSize: Int = Int.MAX_VALUE) =
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if (size < chunkSize) {
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BasicBufferProducer<T>(scope) { send(this@produce) }
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} else {
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BasicBufferProducer<T>(scope) {
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//TODO optimize this!
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asSequence().chunked(chunkSize).forEach {
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send(it.asBuffer())
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}
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}
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}
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/**
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* A buffer processor that works with buffers but could accumulate at lest [accumulate] elements from single input before processing.
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*
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* This class combines functions from [ChunkProcessor] and single buffer processor
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*/
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class AccumulatingBufferProcessor<T, R>(
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scope: CoroutineScope,
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val accumulate: Int,
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val process: suspend (Buffer<T>) -> Buffer<R>
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) :
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AbstractBufferProcessor<T, R>(scope) {
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private val inputChannel = Channel<Buffer<T>>()
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private val outputChannel = inputChannel.map { process(it) }
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override suspend fun receive(): R {
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TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
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}
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override suspend fun receive(): Buffer<T> = output.receive()
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override suspend fun send(value: T) {
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TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
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input.send(value)
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}
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override suspend fun receiveBuffer(): Buffer<R> = outputChannel.receive()
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override suspend fun sendBuffer(buffer: Buffer<T>) {
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inputChannel.send(buffer)
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}
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}
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/**
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* A processor that splits incoming buffers into individual elements
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*/
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class SplitProcessor<T>(scope: CoroutineScope) : AbstractProcessor<Buffer<T>, T>(scope) {
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private val input = Channel<Buffer<T>>()
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private val mutex = Mutex()
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private var currentBuffer: Buffer<T>? = null
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private var pos = 0
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override suspend fun receive(): T {
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mutex.withLock {
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while (currentBuffer == null || pos == currentBuffer!!.size) {
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currentBuffer = input.receive()
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pos = 0
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}
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return currentBuffer!![pos].also { pos++ }
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}
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}
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override suspend fun send(value: Buffer<T>) {
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input.send(value)
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}
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}
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fun <T> Producer<T>.chunked(chunkSize: Int, bufferFactory: BufferFactory<T>) =
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JoinProcessor<T>(this, chunkSize, bufferFactory).also { connect(it) }
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inline fun <reified T : Any> Producer<T>.chunked(chunkSize: Int) =
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JoinProcessor<T>(this, chunkSize, Buffer.Companion::auto).also { connect(it) }
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@ -170,33 +170,6 @@ class PipeProcessor<T, R>(
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}
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}
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/**
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* A [Processor] that splits the input in fixed chunked size and transforms each chunked
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*/
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class ChunkProcessor<T, R>(
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scope: CoroutineScope,
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chunkSize: Int,
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process: suspend (List<T>) -> R
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) : AbstractProcessor<T, R>(scope) {
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private val input = Channel<T>(chunkSize)
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private val chunked = produce<List<T>>(coroutineContext) {
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val list = ArrayList<T>(chunkSize)
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repeat(chunkSize) {
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list.add(input.receive())
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}
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send(list)
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}
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private val output: ReceiveChannel<R> = chunked.map(coroutineContext, process)
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override suspend fun receive(): R = output.receive()
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override suspend fun send(value: T) {
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input.send(value)
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}
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}
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/**
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* A moving window [Processor] with circular buffer
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@ -276,6 +249,9 @@ fun <T> ReceiveChannel<T>.produce(scope: CoroutineScope = GlobalScope) =
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fun <T, C : Consumer<T>> Producer<T>.consumer(consumerFactory: () -> C): C =
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consumerFactory().also { connect(it) }
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fun <T, R> Producer<T>.map(capacity: Int = Channel.RENDEZVOUS, process: suspend (T) -> R) =
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PipeProcessor(this, capacity, process).also { connect(it) }
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/**
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* Create a reducer and connect this producer to reducer
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*/
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@ -294,7 +270,6 @@ fun <T, R, P : Processor<T, R>> Producer<T>.process(processorBuilder: () -> P):
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fun <T, R> Producer<T>.process(capacity: Int = Channel.RENDEZVOUS, process: suspend (T) -> R) =
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PipeProcessor<T, R>(this, capacity, process).also { connect(it) }
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fun <T, R> Producer<T>.chunked(chunkSize: Int, process: suspend (List<T>) -> R) =
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ChunkProcessor(this, chunkSize, process).also { connect(it) }
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fun <T> Producer<T>.chunked(chunkSize: Int) = chunked(chunkSize) { it }
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fun <T, R> Producer<T>.windowed(window: Int, process: suspend (Buffer<T?>) -> R) =
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WindowedProcessor(this, window, process).also { connect(it) }
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