/// <summary>
/// Compute hashes using neural network ensemble
/// </summary>
private void ComputeHashesUsingNeuralHasher()
{
string connectionString = null;
_cmbValidationConnectionStringNeuralHasher.Invoke(new Action(() => { connectionString = _cmbValidationConnectionStringNeuralHasher.SelectedItem.ToString(); }));
FingerprintDescriptor descriptor = new FingerprintDescriptor();
if (String.IsNullOrEmpty(connectionString))
{
MessageBox.Show(Resources.SelectValidationDB);
return;
}
string path = _tbStoredEnsembleFilename.Text;
if (String.IsNullOrEmpty(path))
{
MessageBox.Show(Resources.SelectPathToSerializedEnsemble, Resources.SelectFile, MessageBoxButtons.OK,
MessageBoxIcon.Information);
return;
}
NeuralNetworkEnsemble ensemble = NeuralNetworkEnsemble.Load(path); /*Load the serialized ensemble used to create hashes*/
IList<Track> tracks = modelService.ReadTracks(); /*Read all tracks from the database for which the ensemble will create hashes*/
_pbProgress.Invoke(new Action(() =>
{
_pbProgress.Minimum = 1;
_pbProgress.Maximum = tracks.Count;
_pbProgress.Value = 1;
_pbProgress.Step = 1;
}));
/*Create hashes for each fingerprint in the database*/
for (int index = 0; index < tracks.Count; index++)
{
Track track = tracks[index];
IList<Fingerprint> fingerprints;
try
{
fingerprints = modelService.ReadFingerprintsByTrackId(track.Id, 0);
if (fingerprints == null)
continue;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, Resources.Error, MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
foreach (Fingerprint fingerprint in fingerprints) /*For each track's fingerprint create hash*/
{
ensemble.ComputeHash(descriptor.DecodeFingerprint(fingerprint.Signature));
long[] hashbins = ensemble.ExtractHashBins(); /*Extract hash bin / hash table*/
}
// modelService.InsertHashBin(listToInsert);
_pbProgress.Invoke(new Action(() => _pbProgress.PerformStep()));
}
}
///<summary>
/// Gets tracks/fingerprints from the database
///</summary>
///<param name = "function">Activation function</param>
///<param name = "fingerprintsPerTrack">Fingerprints per track</param>
///<param name = "outputs">Number of outputs from the neural network</param>
///<returns>Dictionary (Int32 - track id, List - list of corresponding fingerprints</returns>
public Dictionary<Int32, List<BasicMLData>> GetNormalizedTrackFingerprints(IActivationFunction function, int fingerprintsPerTrack, int outputs)
{
IList<Track> tracks = modelService.ReadTracks();
IDictionary<int, IList<Fingerprint>> unnormalized = modelService.ReadFingerprintsByMultipleTrackId(tracks, fingerprintsPerTrack);
Dictionary<Int32, List<BasicMLData>> retVal = new Dictionary<Int32, List<BasicMLData>>();
int neededTracks = (int) Math.Pow(2, outputs);
int count = 0;
FingerprintDescriptor descriptor = new FingerprintDescriptor();
foreach (var pair in unnormalized)
{
retVal.Add(pair.Key, new List<BasicMLData>());
foreach (Fingerprint fingerprint in pair.Value)
retVal[pair.Key].Add(new BasicMLData(NormalizeUtils.NormalizeDesiredInputInPlace(function, descriptor.DecodeFingerprint(fingerprint.Signature))));
count++;
if (count > neededTracks - 1)
break;
}
return retVal;
}