/// <summary>
/// Builds an index with randomly generated time series
/// </summary>
public static void BaseIndex()
{
DateTime startTime = DateTime.Now;
// index construction
Index <RawDataFormat> si = new Index <RawDataFormat>(0, new IndexOptions("root"));
DataLoader dl = new GeneratedRawDataLoader(si, Globals.TimeSeriesLength, NUM_TIMESERIES, SEED);
InsertTimeSeries(dl);
Console.WriteLine();
Console.WriteLine("Sequential Disk Accesses: " + DiskCost.seqcost);
Console.WriteLine("Random Disk Accesses: " + DiskCost.rancost);
Console.WriteLine("Read Disk Accesses: " + DiskCost.readcost);
Console.WriteLine("Saved cost in buffer: " + DiskCost.savedcost);
Console.WriteLine();
Index <RawDataFormat> .Save(Globals.IndexRootDir, si);
Index <RawDataFormat> si2 = Index <RawDataFormat> .Load(Globals.IndexRootDir);
DateTime endConstructionTime = DateTime.Now;
Console.WriteLine("Index Construction Time: {0}", endConstructionTime - startTime);
// generate some test queries
const int NUM_QUERIES = 10;
List <double[]> queries = new List <double[]>(NUM_QUERIES);
for (int i = 0; i < NUM_QUERIES; i++)
{
queries.Add(Util.RandomWalk(Globals.TimeSeriesLength));
}
// full sequential scan
Console.WriteLine("Performing full sequential scan.");
Console.WriteLine("--------------------------------");
List <IndexFileDist[]> nnInfo = si.KNearestNeighborSequentialScan(10, queries);
Console.WriteLine();
// query results
Console.WriteLine("Performing exact and approximate search.");
Console.WriteLine("----------------------------------------");
int counter = 0;
for (int i = 0; i < NUM_QUERIES; i++)
{
IndexFileDist exactResult;
si.ExactSearch(queries[i], out exactResult);
IndexFileDist approxResult = Index <RawDataFormat> .MinFileEucDist(queries[i],
si.ApproximateSearch(queries[i]).FileName);
Assert.IsTrue(exactResult == nnInfo[i][0]);
if (approxResult == exactResult)
{
counter++;
Console.WriteLine(approxResult);
}
}
Console.WriteLine("{0} approximate results == exact results.", counter);
Console.WriteLine();
}
public static void SearchQualityExperiment()
{
DateTime startTime = DateTime.Now;
// index construction
Index <RawDataFormat> si = new Index <RawDataFormat>(0, new IndexOptions("root"));
DataLoader dl = new GeneratedRawDataLoader(si, Globals.TimeSeriesLength, NUM_TIMESERIES, SEED);
InsertTimeSeries(dl);
Console.WriteLine();
Console.WriteLine("Sequential Disk Accesses: " + DiskCost.seqcost);
Console.WriteLine("Random Disk Accesses: " + DiskCost.rancost);
Console.WriteLine("Read Disk Accesses: " + DiskCost.readcost);
Console.WriteLine("Saved cost in buffer: " + DiskCost.savedcost);
Console.WriteLine();
Index <RawDataFormat> .Save(Globals.IndexRootDir, si);
Index <RawDataFormat> si2 = Index <RawDataFormat> .Load(Globals.IndexRootDir);
DateTime endConstructionTime = DateTime.Now;
Console.WriteLine("Index Construction Time: {0}", endConstructionTime - startTime);
// avg over queries
const int NUM_QUERIES = 100;
List <double[]> queries = new List <double[]>(NUM_QUERIES);
for (int i = 0; i < NUM_QUERIES; i++)
{
queries.Add(Util.RandomWalk(Globals.TimeSeriesLength));
}
// measured metrics
double approxSearchDist = 0;
double approxSearchNodeDist = 0;
double approxSearchNodeSize = 0;
CostCounter exactSearchCosts = new CostCounter();
for (int i = 0; i < queries.Count; ++i)
{
// exact search
IndexFileDist eRes;
exactSearchCosts += si.ExactSearch(queries[i], out eRes);
// approximate search
TermEntry approxNode = si.ApproximateSearch(queries[i]);
double mDist = double.MaxValue;
List <RawDataFormat> nodeEntries = si.ReturnDataFormatFromTermEntry(approxNode);
double sumDists = 0;
foreach (RawDataFormat rd in nodeEntries)
{
double dist = Util.EuclideanDistance(queries[i], rd.GetTimeSeries());
sumDists += dist;
if (dist < mDist)
{
mDist = dist;
}
}
approxSearchDist += mDist;
approxSearchNodeDist += sumDists / nodeEntries.Count;
approxSearchNodeSize += nodeEntries.Count;
}
approxSearchDist /= queries.Count;
approxSearchNodeDist /= queries.Count;
approxSearchNodeSize /= queries.Count;
using (StreamWriter sw = new StreamWriter(Path.Combine(ROOT_DIR, "searchQuality.txt")))
{
string baseFormat = string.Format("{0}:NumTs_{1}:Th_{2}:Wl_{3}:NewPolicy", NUM_TIMESERIES, Globals.IndexNumMaxEntries, Globals.TimeSeriesLength, Globals.NewSplitPolicy);
sw.WriteLine(baseFormat);
sw.WriteLine("ExactSearchNumIO {0}", exactSearchCosts.IO / (double)queries.Count);
sw.WriteLine("ExactSearchNumCalcuations {0}", exactSearchCosts.distance / (double)queries.Count);
sw.WriteLine("ApproxSearchDistance {0}", approxSearchDist);
sw.WriteLine("ApproxSearchAverageNodeDistance {0}", approxSearchNodeDist);
sw.WriteLine("ApproxSearchAverageNodeSize {0}", approxSearchNodeSize);
sw.WriteLine("ValidationString ");
foreach (double[] query in queries)
{
sw.Write("{0} ", query[1]);
}
sw.WriteLine();
}
}