/// <summary>
/// Constructor.
/// </summary>
/// <param name="evaluators"></param>
public NNEvaluatorPooled(NNEvaluator[] evaluators,
int batchSizeThreshold = DEFAULT_BATCH_THRESHOLD,
float batchDelayMilliseconds = DEFAULT_DELAY_MS,
bool retrieveSupplementalResults = false) : base(evaluators)
{
const int MAX_BATCH_SIZE_THRESHOLD = NNEvaluator.MAX_BATCH_SIZE / 2;
if (batchSizeThreshold > MAX_BATCH_SIZE_THRESHOLD)
{
// Don't allow the batch size threshold to be too close to
// the absolute batch size threshold to avoid overflow in the final pooling.
throw new ArgumentOutOfRangeException(nameof(batchSizeThreshold), $"NNEvaluatorPooled batchSizeThreshold is too large, maximum value: {MAX_BATCH_SIZE_THRESHOLD}");
}
// Verify the evaluators not the same object but are equivalent.
for (int i = 0; i < evaluators.Length; i++)
{
for (int j = 0; j < evaluators.Length; j++)
{
if (i != j && object.ReferenceEquals(evaluators[i], evaluators[j]))
{
throw new ArgumentException("The evaluators passed to NNEvaluatorPooled must not be duplicated");
}
}
if (!evaluators[0].IsEquivalentTo(evaluators[i]))
{
throw new Exception("Cannot combine evaluators with different output in same NNEvaluatorsMultiBatched");
}
}
BatchSizeThreshold = batchSizeThreshold;
BatchDelayMS = batchDelayMilliseconds;
RetrieveSupplementalResults = retrieveSupplementalResults;
pendingPooledBatches = new BlockingCollection <NNEvaluatorPoolBatch>();
cancelSource = new CancellationTokenSource();
cancelToken = cancelSource.Token;
// Create and launch task for each evaluator.
int index = 0;
evaluatorTasks = new List <Task>();
foreach (NNEvaluator evaluator in evaluators)
{
int thisIndex = index;
evaluatorTasks.Add(Task <int> .Run(() => EvaluatorThreadMethod(thisIndex)));
index++;
}
// Create an initial empty batch.
currentPooledBatch = new NNEvaluatorPoolBatch();
// Finally, launch the dispatch task which watches when
// pooled batches have filled sufficiently to be launched.
dispatchTask = Task.Run(DispatchTaskProcessor, cancelToken);
}
/// <summary>
/// Launches the current batch.
/// </summary>
void Launch()
{
pendingPooledBatches.Add(currentPooledBatch);
currentPooledBatch = new NNEvaluatorPoolBatch();
lastBatchTime = DateTime.Now;
}