/*
* Encog(tm) Core v3.4 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2016 Heaton Research, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.neural.networks.training.concurrent;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.encog.EncogError;
import org.encog.NullStatusReportable;
import org.encog.StatusReportable;
import org.encog.neural.NeuralNetworkError;
import org.encog.neural.networks.training.concurrent.jobs.TrainingJob;
import org.encog.neural.networks.training.concurrent.performers.ConcurrentTrainingPerformer;
import org.encog.neural.networks.training.concurrent.performers.ConcurrentTrainingPerformerCPU;
/**
* Concurrent training manager. This class allows you to queue up network
* training tasks to be executed either by the CPU cores or OpenCL devices. This
* allows the CPU/GPU to train neural networks at the same time.
*
*/
public final class ConcurrentTrainingManager implements Runnable {
/**
* The singleton instance.
*/
private static ConcurrentTrainingManager instance;
/**
* @return The singleton instance.
*/
public static ConcurrentTrainingManager getInstance() {
synchronized (ConcurrentTrainingManager.class) {
if (ConcurrentTrainingManager.instance == null) {
ConcurrentTrainingManager.instance = new ConcurrentTrainingManager();
}
return ConcurrentTrainingManager.instance;
}
}
/**
* The event used to sync waiting for tasks to stop.
*/
private final Lock accessLock = new ReentrantLock();
/**
* Condition used to check if we are done.
*/
private final Condition mightBeDone = this.accessLock.newCondition();
/**
* The job number.
*/
private int jobNumber;
/**
* Single threaded?
*/
private boolean singleThreaded;
/**
* The performers to use.
*/
private final List performers = new ArrayList();
/**
* The training jobs to execute.
*/
private final List queue = new ArrayList();
/**
* The background thread.
*/
private Thread thread;
/**
* An object used to report status.
*/
private StatusReportable report = new NullStatusReportable();
/**
* Private constructor.
*/
private ConcurrentTrainingManager() {
}
/**
* Add a performer.
*
* @param performer
* The performer to add.
*/
public void addPerformer(final ConcurrentTrainingPerformer performer) {
try {
this.accessLock.lock();
this.performers.add(performer);
performer.setManager(this);
} finally {
this.accessLock.unlock();
}
}
/**
* Add a training job.
*
* @param job
* The training job to add.
*/
public void addTrainingJob(final TrainingJob job) {
if( job.getStrategies().size()==0 ) {
throw new EncogError("Job has no strategies, it will have no way to know when to end.");
}
try {
this.accessLock.lock();
this.queue.add(job);
} finally {
this.accessLock.unlock();
}
}
/**
* Clear all of the performers.
*/
public void clearPerformers() {
try {
this.accessLock.lock();
this.performers.clear();
} finally {
this.accessLock.unlock();
}
}
/**
* Clear the workload.
*/
public void clearQueue() {
try {
this.accessLock.lock();
this.queue.clear();
} finally {
this.accessLock.unlock();
}
}
/**
* Detect performers. Create one performer for each OpenCL device, and
* another for the CPU's. If there is an OpenCL device already for the CPU,
* do not create another CPU performer.
*/
public void detectPerformers() {
detectPerformers(false);
}
/**
* Detect performers. Create one performer for each OpenCL device, and
* another for the CPU's. If there is an OpenCL device already for the CPU,
* do not create another CPU performer.
*
* @param splitCores
* True, if a CPU performer should be created for each core.
*/
public void detectPerformers(final boolean splitCores) {
try {
int threads = 1;
this.accessLock.lock();
clearPerformers();
setSingleThreaded(splitCores);
if (splitCores) {
final Runtime runtime = Runtime.getRuntime();
threads = runtime.availableProcessors();
} else {
threads = 1;
}
int cpuCount = 0;
for (int i = 0; i < threads; i++) {
addPerformer(new ConcurrentTrainingPerformerCPU(cpuCount++));
}
} finally {
this.accessLock.unlock();
}
}
/**
* @return True, if single threaded.
*/
public boolean isSingleThreaded() {
return this.singleThreaded;
}
/**
* Wait for job to finish.
* @param time The time to wait.
* @param perf The performer.
*/
public void jobDone(final long time,
final ConcurrentTrainingPerformerCPU perf) {
try {
this.jobNumber++;
reportStatus("Job finished in " + time + "ms, on "
+ perf.toString());
this.accessLock.lock();
this.mightBeDone.signal();
} finally {
this.accessLock.unlock();
}
}
/**
* Wait for all tasks to finish.
*/
public void join() {
try {
this.thread.join();
} catch (final InterruptedException e) {
return;
}
}
/**
* If an error has been reported, then throw it as an exception.
*/
private void reportErrors() {
for (final TrainingJob job : this.queue) {
if (job.getError() != null) {
throw new NeuralNetworkError(job.getError());
}
}
}
private void reportStatus(final String str) {
this.report.report(this.queue.size(), this.jobNumber, str);
}
/**
* Perform the training.
*/
@Override
public void run() {
this.jobNumber = 0;
this.report.report(this.queue.size(), 0, "Starting first job");
int count = 0;
for (final TrainingJob job : this.queue) {
// find a performer
final ConcurrentTrainingPerformer perform = waitForFreePerformer();
perform.perform(job);
count++;
reportErrors();
}
// now wait for all performers to finish
boolean done = false;
this.report.report(this.queue.size(), count,
"No more jobs to submit, waiting for last job.");
while (!done) {
try {
this.accessLock.lock();
boolean foundOne = false;
for (final ConcurrentTrainingPerformer performer : this.performers) {
if (!performer.ready()) {
foundOne = true;
}
}
if (foundOne) {
try {
this.mightBeDone.await();
} catch (final InterruptedException e) {
}
} else {
done = true;
}
} finally {
this.accessLock.unlock();
}
}
this.report.report(this.queue.size(), count, "All training done.");
}
/**
* Setup the object to report status to.
*
* @param report
* The object to report status to.
*/
public void setReport(final StatusReportable report) {
this.report = report;
}
public void setSingleThreaded(final boolean singleThreaded) {
this.singleThreaded = singleThreaded;
}
/**
* Start the manager.
*/
public void start() {
this.thread = new Thread(this);
this.thread.start();
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
final StringBuilder builder = new StringBuilder();
int index = 1;
for (final ConcurrentTrainingPerformer performer : this.performers) {
builder.append("Performer ");
builder.append(index++);
builder.append(": ");
builder.append(performer.toString());
builder.append("\n");
}
return builder.toString();
}
/**
* Wait for a free performer.
*
* @return The free performer.
*/
public ConcurrentTrainingPerformer waitForFreePerformer() {
try {
this.accessLock.lock();
ConcurrentTrainingPerformer result = null;
while (result == null) {
for (final ConcurrentTrainingPerformer performer : this.performers) {
if (performer.ready()) {
result = performer;
}
}
if (result == null) {
try {
this.mightBeDone.await();
} catch (final InterruptedException e) {
return null;
}
}
}
return result;
} finally {
this.accessLock.unlock();
}
}
}
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