diff --git a/configure.ac b/configure.ac
index 39773056..a5e1e05d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -89,6 +89,11 @@ AC_CHECK_LIB(	[boost_iostreams],
 		,
 		[AC_MSG_ERROR([libboost_iostreams not found!])])
 
+AC_CHECK_LIB(	[boost_thread],
+		[main],
+		,
+		[AC_MSG_ERROR([libboost_thread not found!])])
+
 AC_CONFIG_FILES([Makefile
 		 src/Makefile
 		 test/Makefile])
diff --git a/src/Makefile.am b/src/Makefile.am
index 22f5e246..2c38a9d8 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -6,6 +6,8 @@ lms_SOURCES = \
 	$(srcdir)/av/AvTranscoder.cpp					\
 	$(srcdir)/cover/CoverArtGrabber.cpp			\
 	$(srcdir)/database/Artist.cpp				\
+	$(srcdir)/database/Classification.cpp			\
+	$(srcdir)/database/DatabaseClassifier.cpp		\
 	$(srcdir)/database/DatabaseHandler.cpp			\
 	$(srcdir)/database/DatabaseUpdater.cpp			\
 	$(srcdir)/database/MediaDirectory.cpp			\
@@ -16,6 +18,7 @@ lms_SOURCES = \
 	$(srcdir)/database/Track.cpp				\
 	$(srcdir)/database/User.cpp				\
 	$(srcdir)/database/Video.cpp				\
+	$(srcdir)/feature/FeatureExtractor.cpp			\
 	$(srcdir)/image/Image.cpp				\
 	$(srcdir)/logger/Logger.cpp				\
 	$(srcdir)/metadata/AvFormat.cpp				\
@@ -54,7 +57,7 @@ lms_SOURCES = \
 	$(srcdir)/ui/settings/SettingsMediaDirectoryFormView.cpp	\
 	$(srcdir)/ui/settings/SettingsUserFormView.cpp		\
 	$(srcdir)/ui/settings/SettingsUsers.cpp			\
-	$(srcdir)/utils/Checksum.cpp				\
+	$(srcdir)/utils/Path.cpp				\
 	$(srcdir)/utils/Utils.cpp
 
 if VIDEO
@@ -65,5 +68,6 @@ lms_SOURCES += \
 	$(srcdir)/ui/video/VideoParametersDialog.cpp
 endif
 
-lms_CXXFLAGS=-std=c++11 -Wall -I$(srcdir)/third-party -I$(srcdir)/ui $(MAGICKXX_CFLAGS)
+lms_CXXFLAGS=-std=c++11 -Wall -I$(srcdir)/third-party -I$(srcdir)/ui $(MAGICKXX_CFLAGS) -D_REENTRANT -DBOOST_SPIRIT_THREADSAFE
 lms_LDADD=$(MAGICKXX_LIBS)
+
diff --git a/src/av/AvTranscoder.cpp b/src/av/AvTranscoder.cpp
index 67ee92b6..c970d334 100644
--- a/src/av/AvTranscoder.cpp
+++ b/src/av/AvTranscoder.cpp
@@ -19,7 +19,7 @@
 #include <atomic>
 #include <mutex>
 
-#include <boost/tokenizer.hpp>
+#include "utils/Path.hpp"
 
 #include "logger/Logger.hpp"
 
@@ -91,37 +91,12 @@ static std::mutex		transcoderMutex;
 static boost::filesystem::path	avConvPath = boost::filesystem::path();
 static std::atomic<size_t>	globalId = {0};
 
-static std::string searchPath(std::string filename)
-{
-	std::string path;
-
-	path = ::getenv("PATH");
-	if (path.empty())
-		throw std::runtime_error("Environment variable PATH not found");
-
-	std::string result;
-	typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
-	boost::char_separator<char> sep(":");
-	tokenizer tok(path, sep);
-	for (tokenizer::iterator it = tok.begin(); it != tok.end(); ++it)
-	{
-		boost::filesystem::path p = *it;
-		p /= filename;
-		if (!::access(p.c_str(), X_OK))
-		{
-			result = p.string();
-			break;
-		}
-	}
-	return result;
-}
-
 void
 Transcoder::init()
 {
 	for (std::string execName : execNames)
 	{
-		boost::filesystem::path p = searchPath(execName);
+		boost::filesystem::path p = searchExecPath(execName);
 		if (!p.empty())
 		{
 			avConvPath = p;
diff --git a/src/av/AvTranscoder.hpp b/src/av/AvTranscoder.hpp
index 7e671fb8..cf958fd3 100644
--- a/src/av/AvTranscoder.hpp
+++ b/src/av/AvTranscoder.hpp
@@ -22,7 +22,7 @@
 #include <map>
 #include <set>
 
-#include "pstreams/pstream.h"
+#include <pstreams/pstream.h>
 
 #include <boost/date_time/posix_time/posix_time_types.hpp> //no i/o just types
 #include <boost/filesystem/path.hpp>
diff --git a/src/database/Classification.hpp b/src/database/Classification.hpp
index 3cedd4fe..a219cf96 100644
--- a/src/database/Classification.hpp
+++ b/src/database/Classification.hpp
@@ -25,12 +25,20 @@ namespace Database {
 
 class Track;
 
-class ClassificationData
+class Feature
 {
 	public:
-		typedef Wt::Dbo::ptr<ClassificationData> pointer;
+		typedef Wt::Dbo::ptr<Feature> pointer;
 
-		ClassificationData() {}
+		Feature() {}
+		Feature(Wt::Dbo::ptr<Track> track, const std::string& type, const std::string& value);
+
+		static pointer create(Wt::Dbo::Session& session, Wt::Dbo::ptr<Track> track, const std::string& type, const std::string& value);
+
+		static std::vector<pointer> getByTrack(Wt::Dbo::Session& session, Track::id_type trackId, const std::string& type);
+
+		std::string getType(void) const { return _type; }
+		std::string getValue(void) const { return _value; }
 
 		template<class Action>
 			void persist(Action& a)
diff --git a/src/database/DatabaseClassifier.cpp b/src/database/DatabaseClassifier.cpp
new file mode 100644
index 00000000..e87ad855
--- /dev/null
+++ b/src/database/DatabaseClassifier.cpp
@@ -0,0 +1,852 @@
+/*
+ * Copyright (C) 2016 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+//#define BOOST_SPIRIT_THREADSAFE
+#include <boost/property_tree/json_parser.hpp>
+
+#include "logger/Logger.hpp"
+#include "feature/FeatureExtractor.hpp"
+
+#include "knnl/neural_net_headers.hpp"
+
+#include "DatabaseClassifier.hpp"
+
+namespace Database {
+
+Classifier::Classifier(Wt::Dbo::SqlConnectionPool& connectionPool)
+: _db(connectionPool)
+{}
+
+void
+Classifier::processTrackUpdate(bool added, Track::id_type trackId)
+{
+	if (!added)
+		return;
+
+	LMS_LOG(DBUPDATER, DEBUG) << "Processing track id " << trackId;
+
+	boost::filesystem::path path;
+
+	{
+		Wt::Dbo::Transaction transaction(_db.getSession());
+
+		Track::pointer track = Database::Track::getById(_db.getSession(), trackId);
+		if (!track)
+			return;
+
+		path = track->getPath();
+
+		// Remove outdated features
+		for (auto feature : track->getFeatures())
+			feature.remove();
+	}
+
+	boost::property_tree::ptree pt;
+	if (!::Feature::Extractor::getLowLevel(pt, path))
+		return;
+
+	std::ostringstream oss;
+	boost::property_tree::write_json(oss, pt);
+
+	{
+		Wt::Dbo::Transaction transaction(_db.getSession());
+
+		Track::pointer track = Database::Track::getById(_db.getSession(), trackId);
+		Feature::pointer feature = Feature::create( _db.getSession(), track, "low_level", oss.str());
+	}
+}
+
+typedef std::vector<double> entry_t;
+typedef std::vector<entry_t> Entries;
+
+static bool entryAddData(entry_t& entry, const boost::property_tree::ptree& pt, std::size_t nbDimensions)
+{
+	if (pt.empty() && nbDimensions == 1)
+	{
+		double value = std::stod(pt.data());
+		entry.push_back(value);
+
+		return true;
+	}
+
+	if (pt.size() == nbDimensions)
+	{
+		for (auto it : pt)
+		{
+			double value = std::stod(it.second.data());
+			entry.push_back(value);
+		}
+
+		return true;
+	}
+
+	LMS_LOG(DBUPDATER, DEBUG) << "Bad entry";
+
+	return false;
+}
+
+struct FeatureDesc
+{
+	std::string	lowLevelName;
+	std::size_t	nbDimensions;
+	double		coeff;
+};
+
+static std::vector<FeatureDesc> features =
+{
+//	{ "lowlevel.average_loudness",		1,	1.0 },
+//	{ "lowlevel.barkbands.dmean",		27,	1.0 },
+//	{ "lowlevel.barkbands.dmean2",		27,	1.0 },
+//	{ "lowlevel.barkbands.dvar",		27,	1.0 },
+//	{ "lowlevel.barkbands.dvar2",		27,	1.0 },
+//	{ "lowlevel.barkbands.max",		27,	1.0 },
+//	{ "lowlevel.barkbands.mean",		27,	1.0 },
+//	{ "lowlevel.barkbands.median",		27,	1.0 },
+//	{ "lowlevel.barkbands.min",		27,	1.0 },
+//	{ "lowlevel.barkbands.var",		27,	1.0 },
+//	{ "lowlevel.barkbands_crest.dmean",	1,	1.0 },
+//	{ "lowlevel.barkbands_crest.dmean2",	1,	1.0 },
+//	{ "lowlevel.barkbands_crest.dvar",	1,	1.0 },
+//	{ "lowlevel.barkbands_crest.dvar2",	1,	1.0 },
+//	{ "lowlevel.barkbands_crest.max",	1,	1.0 },
+//	{ "lowlevel.barkbands_crest.mean",	1,	1.0 },
+//	{ "lowlevel.barkbands_crest.median",	1,	1.0 },
+//	{ "lowlevel.barkbands_crest.min",	1,	1.0 },
+//	{ "lowlevel.barkbands_crest.var",	1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.dmean",	1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.dmean2",	1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.dvar",	1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.dvar2",	1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.max",		1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.mean",	1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.median",	1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.min",		1,	1.0 },
+//	{ "lowlevel.barkbands_flatness_db.var",		1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.dmean",	1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.dmean2",	1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.dvar",	1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.dvar2",	1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.max",	1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.mean",	1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.median",	1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.min",	1,	1.0 },
+//	{ "lowlevel.barkbands_kurtosis.var",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.dmean",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.dmean2",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.dvar",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.dvar2",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.max",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.mean",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.median",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.min",	1,	1.0 },
+//	{ "lowlevel.barkbands_skewness.var",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.dmean",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.dmean2",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.dvar",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.dvar2",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.max",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.mean",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.median",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.min",	1,	1.0 },
+//	{ "lowlevel.barkbands_spread.var",	1,	1.0 },
+//	{ "lowlevel.dissonance.dmean",		1,	1.0 },
+//	{ "lowlevel.dissonance.dmean2",		1,	1.0 },
+//	{ "lowlevel.dissonance.dvar",		1,	1.0 },
+//	{ "lowlevel.dissonance.dvar2",		1,	1.0 },
+//	{ "lowlevel.dissonance.max",		1,	1.0 },
+//	{ "lowlevel.dissonance.mean",		1,	1.0 },
+//	{ "lowlevel.dissonance.median",		1,	1.0 },
+//	{ "lowlevel.dissonance.min",		1,	1.0 },
+//	{ "lowlevel.dissonance.var",		1,	1.0 },
+//	{ "lowlevel.dynamic_complexity",	1,	1.0 },
+//	{ "lowlevel.erbbands.dmean",		40,	1.0 },
+//	{ "lowlevel.erbbands.dmean2",		40,	1.0 },
+//	{ "lowlevel.erbbands.dvar",		40,	1.0 },
+//	{ "lowlevel.erbbands.dvar2",		40,	1.0 },
+//	{ "lowlevel.erbbands.max",		40,	1.0 },
+//	{ "lowlevel.erbbands.mean",		40,	1.0 },
+//	{ "lowlevel.erbbands.median",		40,	1.0 },
+//	{ "lowlevel.erbbands.min",		40,	1.0 },
+//	{ "lowlevel.erbbands.var",		40,	1.0 },
+//	{ "lowlevel.erbbands_crest.dmean",		1,	1.0 },
+//	{ "lowlevel.erbbands_crest.dmean2",		1,	1.0 },
+//	{ "lowlevel.erbbands_crest.dvar",		1,	1.0 },
+//	{ "lowlevel.erbbands_crest.dvar2",		1,	1.0 },
+//	{ "lowlevel.erbbands_crest.max",		1,	1.0 },
+//	{ "lowlevel.erbbands_crest.mean",		1,	1.0 },
+//	{ "lowlevel.erbbands_crest.median",		1,	1.0 },
+//	{ "lowlevel.erbbands_crest.min",		1,	1.0 },
+//	{ "lowlevel.erbbands_crest.var",		1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.dmean",	1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.dmean2",	1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.dvar",		1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.dvar2",	1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.max",		1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.mean",		1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.median",	1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.min",		1,	1.0 },
+//	{ "lowlevel.erbbands_flatness_db.var",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.dmean",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.dmean2",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.dvar",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.dvar2",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.max",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.mean",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.median",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.min",		1,	1.0 },
+//	{ "lowlevel.erbbands_kurtosis.var",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.dmean",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.dmean2",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.dvar",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.dvar2",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.max",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.mean",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.median",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.min",		1,	1.0 },
+//	{ "lowlevel.erbbands_skewness.var",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.dmean",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.dmean2",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.dvar",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.dvar2",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.max",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.mean",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.median",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.min",		1,	1.0 },
+//	{ "lowlevel.erbbands_spread.var",		1,	1.0 },
+//	{ "lowlevel.gfcc.mean",				13,	1.0 },
+//	{ "lowlevel.hfc.dmean",				1,	1.0 },
+//	{ "lowlevel.hfc.dmean2",			1,	1.0 },
+//	{ "lowlevel.hfc.dvar",				1,	1.0 },
+//	{ "lowlevel.hfc.dvar2",				1,	1.0 },
+//	{ "lowlevel.hfc.max",				1,	1.0 },
+//	{ "lowlevel.hfc.mean",				1,	1.0 },
+//	{ "lowlevel.hfc.median",			1,	1.0 },
+//	{ "lowlevel.hfc.min",				1,	1.0 },
+//	{ "lowlevel.hfc.var",				1,	1.0 },
+//	{ "lowlevel.melbands.dmean",			40,	1.0 },
+//	{ "lowlevel.melbands.dmean2",			40,	1.0 },
+//	{ "lowlevel.melbands.dvar",			40,	1.0 },
+//	{ "lowlevel.melbands.dvar2",			40,	1.0 },
+//	{ "lowlevel.melbands.max",			40,	1.0 },
+//	{ "lowlevel.melbands.mean",			40,	1.0 },
+//	{ "lowlevel.melbands.median",			40,	1.0 },
+//	{ "lowlevel.melbands.min",			40,	1.0 },
+//	{ "lowlevel.melbands.var",			40,	1.0 },
+//	{ "lowlevel.melbands_crest.dmean",		1,	1.0 },
+//	{ "lowlevel.melbands_crest.dmean2",		1,	1.0 },
+//	{ "lowlevel.melbands_crest.dvar",		1,	1.0 },
+//	{ "lowlevel.melbands_crest.dvar2",		1,	1.0 },
+//	{ "lowlevel.melbands_crest.max",		1,	1.0 },
+//	{ "lowlevel.melbands_crest.mean",		1,	1.0 },
+//	{ "lowlevel.melbands_crest.median",		1,	1.0 },
+//	{ "lowlevel.melbands_crest.min",		1,	1.0 },
+//	{ "lowlevel.melbands_crest.var",		1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.dmean",	1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.dmean2",	1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.dvar",		1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.dvar2",	1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.max",		1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.mean",		1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.median",	1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.min",		1,	1.0 },
+//	{ "lowlevel.melbands_flatness_db.var",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.dmean",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.dmean2",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.dvar",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.dvar2",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.max",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.mean",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.median",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.min",		1,	1.0 },
+//	{ "lowlevel.melbands_kurtosis.var",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.dmean",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.dmean2",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.dvar",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.dvar2",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.max",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.mean",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.median",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.min",		1,	1.0 },
+//	{ "lowlevel.melbands_spread.var",		1,	1.0 },
+//	{ "lowlevel.mfcc.mean",				13,	1.0 },
+//	{ "lowlevel.pitch_salience.dmean",		1,	1.0 },
+//	{ "lowlevel.pitch_salience.dmean2",		1,	1.0 },
+//	{ "lowlevel.pitch_salience.dvar",		1,	1.0 },
+//	{ "lowlevel.pitch_salience.dvar2",		1,	1.0 },
+//	{ "lowlevel.pitch_salience.max",		1,	1.0 },
+//	{ "lowlevel.pitch_salience.mean",		1,	1.0 },
+//	{ "lowlevel.pitch_salience.median",		1,	1.0 },
+//	{ "lowlevel.pitch_salience.min",		1,	1.0 },
+//	{ "lowlevel.pitch_salience.var",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.dmean",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.dmean2",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.dvar",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.dvar2",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.max",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.mean",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.median",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.min",		1,	1.0 },
+//	{ "lowlevel.silence_rate_20dB.var",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.dmean",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.dmean2",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.dvar",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.dvar2",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.max",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.mean",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.median",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.min",		1,	1.0 },
+//	{ "lowlevel.silence_rate_30dB.var",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.dmean",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.dmean2",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.dvar",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.dvar2",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.max",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.mean",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.median",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.min",		1,	1.0 },
+//	{ "lowlevel.silence_rate_60dB.var",		1,	1.0 },
+//	{ "lowlevel.spectral_centroid.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_centroid.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_centroid.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_centroid.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_centroid.max",		1,	1.0 },
+	{ "lowlevel.spectral_centroid.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_centroid.median",		1,	1.0 },
+//	{ "lowlevel.spectral_centroid.min",		1,	1.0 },
+//	{ "lowlevel.spectral_centroid.var",		1,	1.0 },
+//	{ "lowlevel.spectral_complexity.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_complexity.dmean2",	1,	1.0 },
+//	{ "lowlevel.spectral_complexity.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_complexity.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_complexity.max",		1,	1.0 },
+	{ "lowlevel.spectral_complexity.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_complexity.median",	1,	1.0 },
+//	{ "lowlevel.spectral_complexity.min",		1,	1.0 },
+//	{ "lowlevel.spectral_complexity.var",		1,	1.0 },
+//	{ "lowlevel.spectral_decrease.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_decrease.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_decrease.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_decrease.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_decrease.max",		1,	1.0 },
+	{ "lowlevel.spectral_decrease.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_decrease.median",		1,	1.0 },
+//	{ "lowlevel.spectral_decrease.min",		1,	1.0 },
+//	{ "lowlevel.spectral_decrease.var",		1,	1.0 },
+//	{ "lowlevel.spectral_energy.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_energy.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_energy.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_energy.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_energy.max",		1,	1.0 },
+	{ "lowlevel.spectral_energy.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_energy.median",		1,	1.0 },
+//	{ "lowlevel.spectral_energy.min",		1,	1.0 },
+//	{ "lowlevel.spectral_energy.var",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_low.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_low.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_low.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_low.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_low.max",		1,	1.0 },
+	{ "lowlevel.spectral_energyband_low.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_low.median",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_low.min",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_low.var",		1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_high.dmean",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_high.dmean2",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_high.dvar",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_high.dvar2",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_high.max",	1,	1.0 },
+	{ "lowlevel.spectral_energyband_middle_high.mean",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_high.median",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_high.min",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_high.var",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_low.dmean",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_low.dmean2",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_low.dvar",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_low.dvar2",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_low.max",	1,	1.0 },
+	{ "lowlevel.spectral_energyband_middle_low.mean",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_low.median",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_low.min",	1,	1.0 },
+//	{ "lowlevel.spectral_energyband_middle_low.var",	1,	1.0 },
+//	{ "lowlevel.spectral_entropy.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_entropy.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_entropy.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_entropy.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_entropy.max",		1,	1.0 },
+	{ "lowlevel.spectral_entropy.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_entropy.median",		1,	1.0 },
+//	{ "lowlevel.spectral_entropy.min",		1,	1.0 },
+//	{ "lowlevel.spectral_entropy.var",		1,	1.0 },
+//	{ "lowlevel.spectral_flux.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_flux.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_flux.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_flux.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_flux.max",			1,	1.0 },
+//	{ "lowlevel.spectral_flux.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_flux.median",		1,	1.0 },
+//	{ "lowlevel.spectral_flux.min",			1,	1.0 },
+//	{ "lowlevel.spectral_flux.var",			1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.max",		1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.median",		1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.min",		1,	1.0 },
+//	{ "lowlevel.spectral_kurtosis.var",		1,	1.0 },
+//	{ "lowlevel.spectral_rms.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_rms.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_rms.dvar",			1,	1.0 },
+//	{ "lowlevel.spectral_rms.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_rms.max",			1,	1.0 },
+	{ "lowlevel.spectral_rms.mean",			1,	1.0 },
+//	{ "lowlevel.spectral_rms.median",		1,	1.0 },
+//	{ "lowlevel.spectral_rms.min",			1,	1.0 },
+//	{ "lowlevel.spectral_rms.var",			1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.max",		1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.median",		1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.min",		1,	1.0 },
+//	{ "lowlevel.spectral_rolloff.var",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.max",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.median",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.min",		1,	1.0 },
+//	{ "lowlevel.spectral_skewness.var",		1,	1.0 },
+//	{ "lowlevel.spectral_spread.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_spread.dmean2",		1,	1.0 },
+//	{ "lowlevel.spectral_spread.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_spread.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_spread.max",		1,	1.0 },
+	{ "lowlevel.spectral_spread.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_spread.median",		1,	1.0 },
+//	{ "lowlevel.spectral_spread.min",		1,	1.0 },
+//	{ "lowlevel.spectral_spread.var",		1,	1.0 },
+//	{ "lowlevel.spectral_strongpeak.dmean",		1,	1.0 },
+//	{ "lowlevel.spectral_strongpeak.dmean2",	1,	1.0 },
+//	{ "lowlevel.spectral_strongpeak.dvar",		1,	1.0 },
+//	{ "lowlevel.spectral_strongpeak.dvar2",		1,	1.0 },
+//	{ "lowlevel.spectral_strongpeak.max",		1,	1.0 },
+	{ "lowlevel.spectral_strongpeak.mean",		1,	1.0 },
+//	{ "lowlevel.spectral_strongpeak.median",	1,	1.0 },
+//	{ "lowlevel.spectral_strongpeak.min",		1,	1.0 },
+//	{ "lowlevel.spectral_strongpeak.var",		1,	1.0 },
+//	{ "lowlevel.zerocrossingrate.dmean",		1,	1.0 },
+//	{ "lowlevel.zerocrossingrate.dmean2",		1,	1.0 },
+//	{ "lowlevel.zerocrossingrate.dvar",		1,	1.0 },
+//	{ "lowlevel.zerocrossingrate.dvar2",		1,	1.0 },
+//	{ "lowlevel.zerocrossingrate.max",		1,	1.0 },
+	{ "lowlevel.zerocrossingrate.mean",		1,	1.0 },
+//	{ "lowlevel.zerocrossingrate.median",		1,	1.0 },
+//	{ "lowlevel.zerocrossingrate.min",		1,	1.0 },
+//	{ "lowlevel.zerocrossingrate.var",		1,	1.0 },
+//	{ "rhythm.beats_count",				1,	1.0 },
+//	{ "rhythm.beats_loudness.dmean",		1,	1.0 },
+//	{ "rhythm.beats_loudness.dmean2",		1,	1.0 },
+//	{ "rhythm.beats_loudness.dvar",			1,	1.0 },
+//	{ "rhythm.beats_loudness.dvar2",		1,	1.0 },
+//	{ "rhythm.beats_loudness.max",			1,	1.0 },
+	{ "rhythm.beats_loudness.mean",			1,	1.0 },
+//	{ "rhythm.beats_loudness.median",		1,	1.0 },
+//	{ "rhythm.beats_loudness.min",			1,	1.0 },
+//	{ "rhythm.beats_loudness.var",			1,	1.0 },
+//	{ "rhythm.bpm",					1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.dmean",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.dmean2",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.dvar",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.dvar2",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.max",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.mean",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.median",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.min",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_bpm.var",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.dmean",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.dmean2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.dvar",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.dvar2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.max",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.mean",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.median",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.min",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_spread.var",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.dmean",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.dmean2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.dvar",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.dvar2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.max",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.mean",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.median",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.min",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_first_peak_weight.var",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.dmean",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.dmean2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.dvar",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.dvar2",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.max",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.mean",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.median",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.min",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_bpm.var",		1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.dmean",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.dmean2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.dvar",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.dvar2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.max",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.mean",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.median",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.min",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_spread.var",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.dmean",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.dmean2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.dvar",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.dvar2",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.max",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.mean",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.median",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.min",	1,	1.0 },
+//	{ "rhythm.bpm_histogram_second_peak_weight.var",	1,	1.0 },
+//	{ "rhythm.danceability",				1,	1.0},
+//	{ "rhythm.onset_rate",				1,	1.0},
+//
+//	{ "tonal.chords_changes_rate",		1,	1.0 },
+//	{ "tonal.chords_histogram",		24,	1.0 },
+//	{ "tonal.chords_number_rate",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.dmean",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.dmean2",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.dvar",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.dvar2",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.max",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.mean",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.median",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.min",		1,	1.0 },
+//	{ "tonal.hpcp_entropy.var",		1,	1.0 },
+//	{ "tonal.tuning_frequency",		1,	1.0 },
+};
+
+static bool entryConstructFromJSON(entry_t& entry, const std::string& jsonData)
+{
+	std::istringstream iss(jsonData);
+	boost::property_tree::ptree pt;
+	boost::property_tree::json_parser::read_json(iss, pt);
+
+	for (auto& elem : features)
+	{
+		auto child = pt.get_child_optional(elem.lowLevelName);
+
+		if (!child)
+		{
+			LMS_LOG(DBUPDATER, DEBUG) << "Cannot get '" << elem.lowLevelName << "'";
+			return false;
+		}
+
+		if (!entryAddData(entry, *child,  elem.nbDimensions))
+			return false;
+	}
+
+	return true;
+}
+
+static entry_t computeWeightCoeffs(const Entries& entries)
+{
+	std::vector<FeatureDesc> expandedFeatures;
+	std::vector<double> userCoeffs;
+
+	for (auto& feature : features)
+	{
+		for (std::size_t i = 0; i < feature.nbDimensions; ++i)
+		{
+			expandedFeatures.push_back( { feature.lowLevelName + std::to_string(i), 1, feature.coeff / (double)feature.nbDimensions} );
+		}
+	}
+
+	entry_t coeffs;
+
+	::neural_net::Ranges<Entries> ranges (*entries.begin());
+	ranges( entries );
+
+	entry_t::const_iterator pos_max = ranges.get_max().begin();
+	entry_t::const_iterator pos_min = ranges.get_min().begin();
+	for (std::size_t i = 0; pos_max != ranges.get_max().end(); ++pos_max, ++pos_min, ++i)
+	{
+		coeffs.push_back( expandedFeatures.at(i).coeff *
+				::operators::inverse (
+					( *pos_max - *pos_min ) * ( *pos_max - *pos_min )
+					) ); // weight for i-th axis
+		std::cout << "Feature = " << expandedFeatures.at(i).lowLevelName << std::endl;
+		std::cout << "min = " << *pos_min << ", max = " << *pos_max << std::endl;
+		std::cout << "Coeff = " << coeffs.back() << std::endl;
+	}
+	return coeffs;
+}
+	template <class T, size_t ROW, size_t COL>
+		using Matrix = std::array<std::array<T, COL>, ROW>;
+
+void
+Classifier::processDatabaseUpdate(Updater::Stats stats)
+{
+	LMS_LOG(DBUPDATER, DEBUG) << "Database complete Called!";
+
+//	typedef ::neural_net::Cauchy_function < entry_t::value_type, entry_t::value_type, ::boost::int32_t> CauchyFunction;
+
+	typedef ::neural_net::Gauss_function < entry_t::value_type, entry_t::value_type, ::boost::int32_t > GaussFunction;
+
+//	typedef ::distance::Euclidean_distance_function < entry_t > EuclideanDistFunction;
+	typedef ::distance::Weighted_euclidean_distance_function < entry_t, entry_t > WeightedEuclideanDistFunction;
+
+	typedef ::neural_net::Basic_neuron < GaussFunction, WeightedEuclideanDistFunction > KohonenNeuron;
+	typedef ::neural_net::Rectangular_container < KohonenNeuron > KohonenNetwork;
+
+//	typedef ::neural_net::Hexagonal_topology < ::boost::int32_t > HexagonalTopology;
+	typedef ::neural_net::Max_topology < ::boost::int32_t > MaxTopology;
+
+	typedef GaussFunction GaussFunctionSpace;
+	typedef ::neural_net::Gauss_function < ::boost::int32_t, entry_t::value_type, ::boost::int32_t > GaussFunctionNet;
+//	typedef ::neural_net::Constant_function < entry_t::value_type, entry_t::value_type > ConstFuncSpace;
+
+	typedef ::neural_net::Classic_training_weight
+		<
+		entry_t,
+		::boost::int32_t,
+		GaussFunctionNet,
+		GaussFunctionSpace,
+		MaxTopology,
+		WeightedEuclideanDistFunction,
+		::boost::int32_t
+			> ClassicWeight;
+
+	typedef ::neural_net::Wtm_classical_training_functional
+		<
+		entry_t,
+		double,
+		::boost::int32_t,
+		::boost::int32_t,
+		ClassicWeight
+			> WtmTrainingFunc;
+
+	typedef ::neural_net::Wtm_training_algorithm
+		<
+		KohonenNetwork,
+		entry_t,
+		Entries::iterator,
+		WtmTrainingFunc,
+		::boost::int32_t
+			> WtmTrainingAlg;
+
+	Entries entries;
+
+	LMS_LOG(DBUPDATER, DEBUG) << "Getting track ids";
+
+	std::vector<Track::id_type> trackIdsAll;
+	{
+		Wt::Dbo::Transaction transaction(_db.getSession());
+
+		trackIdsAll = Database::Track::getAllIds(_db.getSession());
+	}
+
+	::std::random_shuffle ( trackIdsAll.begin(), trackIdsAll.end() );
+
+	LMS_LOG(DBUPDATER, DEBUG) << "Getting JSON data";
+	std::vector<Track::id_type> trackIds;
+	for (Track::id_type trackId : trackIdsAll)
+	{
+		std::string jsonData;
+
+		{
+			Wt::Dbo::Transaction transaction(_db.getSession());
+
+			std::vector<Feature::pointer> features = Feature::getByTrack(_db.getSession(), trackId, "low_level");
+
+			if (features.empty())
+			{
+				LMS_LOG(DBUPDATER, DEBUG) << "No JSON data for track " << trackId;;
+				continue;
+			}
+
+			jsonData = features.front()->getValue();
+		}
+
+		entry_t entry;
+		if (entryConstructFromJSON(entry, jsonData))
+		{
+			trackIds.push_back(trackId);
+			entries.push_back(entry);
+		}
+		else
+		{
+			LMS_LOG(DBUPDATER, ERROR) << "Skipping track " << trackId;
+			continue;
+		}
+
+//		if (entries.size() > 100)
+//			break;
+	}
+	std::cout << "Feature vector dimension = " << entries.front().size() << std::endl;
+
+	if (entries.empty())
+		return;
+
+	// TODO compute rows / columns from the DBB
+	const std::size_t nbRows = 32;
+	const std::size_t nbColumns = 32;
+
+	//	CauchyFunction cauchyFunc(2.0, 1);
+	GaussFunction gaussFunc(2.0, 1 );
+
+	LMS_LOG(DBUPDATER, DEBUG) << "Computing coeffs";
+	entry_t coeffs = computeWeightCoeffs(entries);
+	LMS_LOG(DBUPDATER, DEBUG) << "Initializing distfunc";
+	WeightedEuclideanDistFunction weightedEuclideanDistFunc (&coeffs);
+
+	// prepare randomization policy
+	::neural_net::Internal_randomize internalRandomize;
+
+	KohonenNetwork network;
+
+	// generate networks initialized by data
+	LMS_LOG(DBUPDATER, DEBUG) << "Generating network...";
+	::neural_net::generate_kohonen_network(nbRows, nbColumns, gaussFunc, weightedEuclideanDistFunc, entries, network, internalRandomize);
+
+	::std::cout << "Network weights:" << ::std::endl;
+	::neural_net::print_network_weights ( ::std::cout, network );
+	::std::cout << ::std::endl;
+
+	GaussFunctionNet gaussFuncNetwork(10, 1);
+	GaussFunctionSpace gaussFuncSpace(10, 1);
+	MaxTopology maxTopology;
+//	EuclideanDistFunction euclideanDistFunc;
+
+	ClassicWeight classicWeight(gaussFuncNetwork, gaussFuncSpace, maxTopology, weightedEuclideanDistFunc);
+	WtmTrainingFunc trainingFunc(classicWeight, 0.3);
+
+	WtmTrainingAlg wtmTrainAlg( trainingFunc );
+
+	LMS_LOG(DBUPDATER, DEBUG) << "Training...";
+	// tricky training
+	std::size_t nbPass = 20;
+	for (std::size_t i = 0; i < nbPass; ++i )
+	{
+		LMS_LOG(DBUPDATER, DEBUG) << "Training pass " << i << " / " << nbPass;
+		// train network using data
+		auto entries_copy = entries;
+		::std::random_shuffle ( entries_copy.begin(), entries_copy.end() );
+
+		wtmTrainAlg(entries_copy.begin(), entries_copy.end(), &network);
+
+		// decrease sigma parameter in network will make training proces more sharpen with each epoch,
+		// but it have to be done slowly :-)
+	wtmTrainAlg.training_functional.generalized_training_weight.network_function.sigma *= 2.0/3.0;
+//		wtmTrainAlg.training_functional.generalized_training_weight.network_function.sigma *= 9.0/10.0;
+
+		// shuffle data
+//		::std::random_shuffle ( entries.begin(), entries.end() );
+	}
+	LMS_LOG(DBUPDATER, DEBUG) << "Training DONE...";
+
+	::std::cout << "Network weights:" << ::std::endl;
+	::neural_net::print_network_weights ( ::std::cout, network );
+	::std::cout << ::std::endl;
+
+	struct ClusterEntry
+	{
+		Track::id_type trackId;
+		entry_t	entry;
+		double distance;
+	};
+
+	Matrix<std::vector<ClusterEntry>, nbRows, nbColumns> trackClusters;
+
+	for (std::size_t id = 0; id < entries.size(); ++id)
+	{
+		std::cout << "Entry " << id << " : " << std::endl;
+		// Display input vector
+		for (auto& value : entries[id])
+		{
+			std::cout << value << " ";
+		}
+		std::cout << std::endl;
+
+		auto entry = entries[id];
+		std::pair<int, int> coordinates = {0,0};
+		double maxValue = 0.0;
+
+		for (std::size_t i = 0; i < network.objects.size(); ++i)
+		{
+			for (std::size_t j = 0; j < network.objects[0].size(); ++j)
+			{
+				double value = network.objects[i][j]( entry);
+				if (value > maxValue)
+				{
+					coordinates = {i, j};
+					maxValue = value;
+				}
+			}
+		}
+
+/*		::std::cout << "Network for entry " << id << std::endl;
+		::neural_net::print_network ( ::std::cout, network, entry );
+		::std::cout << ::std::endl;
+
+		std::cout << "Max is in {" << coordinates.first << ", " << coordinates.second << "}" << std::endl;
+		*/
+		trackClusters[coordinates.first][coordinates.second].push_back({trackIds[id], entry, maxValue});
+	}
+
+
+	for (std::size_t i = 0; i < nbRows; i++)
+	{
+		for (std::size_t j = 0; j < nbColumns; j++)
+		{
+			std::cout << "Cluster [" << i << "," << j << "] - ";
+
+			// Display the neuron for this cluster
+			for (auto& value : network.objects[i][j].weights)
+				std::cout << value << " ";
+			std::cout << std::endl;
+
+			for (auto track : trackClusters[i][j])
+			{
+				Wt::Dbo::Transaction transaction(_db.getSession());
+
+				std::cout << "- " << track.distance;
+
+				Track::pointer t = Database::Track::getById(_db.getSession(), track.trackId);
+				std::cout << " - " << track.trackId << " - " << t->getArtist()->getName() << " - " << t->getName() << " - (" ;
+
+				// Display input vector
+				for (auto& value : track.entry)
+					std::cout << value << " ";
+				std::cout << ")" << std::endl;
+			}
+		}
+	}
+
+
+}
+
+} // namespace Database
+
diff --git a/src/database/DatabaseClassifier.hpp b/src/database/DatabaseClassifier.hpp
new file mode 100644
index 00000000..a566d291
--- /dev/null
+++ b/src/database/DatabaseClassifier.hpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <Wt/Dbo/Dbo>
+
+#include "DatabaseHandler.hpp"
+#include "DatabaseUpdater.hpp"
+
+namespace Database {
+
+class ClusterClassifier
+{
+	public:
+		ClusterClassifier();
+
+
+	private:
+
+};
+
+
+class Classifier
+{
+	public:
+		Classifier(Wt::Dbo::SqlConnectionPool& connectionPool);
+
+		void processTrackUpdate(bool added, Track::id_type trackId);
+		void processDatabaseUpdate(Updater::Stats stats);
+
+	private:
+
+		Database::Handler _db;
+};
+
+
+} // namespace Database
+
diff --git a/src/database/DatabaseHandler.cpp b/src/database/DatabaseHandler.cpp
index 1a6307dd..7458a46b 100644
--- a/src/database/DatabaseHandler.cpp
+++ b/src/database/DatabaseHandler.cpp
@@ -84,7 +84,7 @@ Handler::Handler(Wt::Dbo::SqlConnectionPool& connectionPool)
 	_session.mapClass<Database::Genre>("genre");
 	_session.mapClass<Database::Track>("track");
 	_session.mapClass<Database::Classification>("classification");
-	_session.mapClass<Database::ClassificationData>("classification_data");
+	_session.mapClass<Database::Feature>("feature");
 	_session.mapClass<Database::Playlist>("playlist");
 	_session.mapClass<Database::PlaylistEntry>("playlist_entry");
 	_session.mapClass<Database::Release>("release");
@@ -105,6 +105,7 @@ Handler::Handler(Wt::Dbo::SqlConnectionPool& connectionPool)
 		_session.execute("CREATE INDEX genre_name_idx ON genre(name)");
 		_session.execute("CREATE INDEX release_name_idx ON release(name)");
 		_session.execute("CREATE INDEX track_name_idx ON track(name)");
+		_session.execute("CREATE INDEX feature_type ON feature(type)");
 	}
 	catch(std::exception& e) {
 		LMS_LOG(DB, ERROR) << "Cannot create tables: " << e.what();
diff --git a/src/database/DatabaseUpdater.cpp b/src/database/DatabaseUpdater.cpp
index d1420d89..219da9ee 100644
--- a/src/database/DatabaseUpdater.cpp
+++ b/src/database/DatabaseUpdater.cpp
@@ -26,7 +26,7 @@
 #include "logger/Logger.hpp"
 #include "cover/CoverArtGrabber.hpp"
 #include "utils/Utils.hpp"
-#include "utils/Checksum.hpp"
+#include "utils/Path.hpp"
 
 #include "Types.hpp"
 #include "DatabaseUpdater.hpp"
@@ -288,6 +288,8 @@ Updater::process(boost::system::error_code err)
 
 		}
 
+		scanComplete().emit(stats);
+
 		if (_running)
 			processNextJob();
 	}
@@ -597,7 +599,11 @@ Updater::processAudioFile( const boost::filesystem::path& file, Stats& stats)
 		track.modify()->setCoverType( hasCover ? Track::CoverType::Embedded : Track::CoverType::None );
 	}
 
+	Track::id_type trackId = track.id();
+
 	transaction.commit();
+
+	_sigTrackChanged.emit(true, trackId);
 }
 
 
diff --git a/src/database/DatabaseUpdater.hpp b/src/database/DatabaseUpdater.hpp
index 14e7e213..3ef4cda0 100644
--- a/src/database/DatabaseUpdater.hpp
+++ b/src/database/DatabaseUpdater.hpp
@@ -17,8 +17,7 @@
  * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef DB_UPDATER_HPP
-#define DB_UPDATER_HPP
+#pragma once
 
 #include <Wt/WIOService>
 #include <Wt/WSignal>
@@ -36,6 +35,18 @@ namespace Database {
 class Updater
 {
 	public:
+
+		static Updater& instance();
+
+		void setConnectionPool(Wt::Dbo::SqlConnectionPool& connectionPool);
+
+		void setAudioExtensions(const std::vector<std::string>&	extensions);
+		void setVideoExtensions(const std::vector<std::string>&	extensions);
+
+		void start();
+		void stop();
+		void restart();
+
 		struct Stats
 		{
 			std::size_t	nbSkipped = 0;		// no change since last scan
@@ -49,18 +60,12 @@ class Updater
 			std::size_t nbChanges() const { return nbAdded + nbRemoved + nbModified;}
 		};
 
-		static Updater& instance();
+		// Emitted when the whole database has been scanned
+		Wt::Signal<Stats>& scanComplete() { return _sigScanComplete; }
 
-		void setConnectionPool(Wt::Dbo::SqlConnectionPool& connectionPool);
-
-		void setAudioExtensions(const std::vector<std::string>&	extensions);
-		void setVideoExtensions(const std::vector<std::string>&	extensions);
-
-		void start();
-		void stop();
-		void restart();
-
-		Wt::Signal<Stats>& changed() { return _sigChanged; }
+		// Emitted when a track changed
+		// true -> added or modified, false -> to be deleted
+		Wt::Signal<bool, Track::id_type>& trackChanged() { return _sigTrackChanged; }
 
 		std::mutex&	getMutex(void) { return _mutex; }
 
@@ -109,7 +114,10 @@ class Updater
 
 		bool			_running;
 		Wt::WIOService		_ioService;
-		Wt::Signal<Stats>	_sigChanged;
+		Wt::Signal<Stats>	_sigScanComplete;
+		Wt::Signal<bool, Artist::id_type>	_sigArtistChanged;
+		Wt::Signal<bool, Release::id_type>	_sigReleaseChanged;
+		Wt::Signal<bool, Track::id_type>	_sigTrackChanged;
 		std::mutex		_mutex;
 
 		boost::asio::deadline_timer _scheduleTimer;
@@ -126,4 +134,3 @@ class Updater
 
 } // Database
 
-#endif
diff --git a/src/database/Track.cpp b/src/database/Track.cpp
index 7967c81a..be705d70 100644
--- a/src/database/Track.cpp
+++ b/src/database/Track.cpp
@@ -44,6 +44,13 @@ Track::getAll(Wt::Dbo::Session& session)
 	return session.find<Track>();
 }
 
+std::vector<Track::id_type>
+Track::getAllIds(Wt::Dbo::Session& session)
+{
+	Wt::Dbo::collection<Track::id_type> res = session.query<Track::id_type>("SELECT id from track");
+	return std::vector<Track::id_type>(res.begin(), res.end());
+}
+
 void
 Track::setGenres(std::vector<Genre::pointer> genres)
 {
@@ -109,6 +116,14 @@ Track::getGenres(void) const
 	return genres;
 }
 
+std::vector< Wt::Dbo::ptr<Feature> >
+Track::getFeatures(void) const
+{
+	std::vector< Wt::Dbo::ptr<Feature> > features;
+	std::copy(_features.begin(), _features.end(), std::back_inserter(features));
+	return features;
+}
+
 Wt::Dbo::Query< Track::pointer >
 Track::getQuery(Wt::Dbo::Session& session, SearchFilter filter)
 {
diff --git a/src/database/Track.hpp b/src/database/Track.hpp
index d4d3c464..8b10223d 100644
--- a/src/database/Track.hpp
+++ b/src/database/Track.hpp
@@ -30,6 +30,8 @@
 
 #include <Wt/WDateTime>
 
+#include "SearchFilter.hpp"
+
 namespace Database {
 
 
@@ -38,7 +40,7 @@ class Release;
 class Track;
 class PlaylistEntry;
 class Classification;
-class ClassificationData;
+class Feature;
 
 class Genre
 {
@@ -109,6 +111,7 @@ class Track
 		static std::vector<pointer> 	getByFilter(Wt::Dbo::Session& session, SearchFilter filter, int offset = -1, int size = -1);
 		static std::vector<pointer> 	getByFilter(Wt::Dbo::Session& session, SearchFilter filter, int offset, int size, bool &moreResults);
 		static Wt::Dbo::collection< pointer > getAll(Wt::Dbo::Session& session);
+		static std::vector<id_type> getAllIds(Wt::Dbo::Session& session);
 		static std::vector<boost::filesystem::path> getAllPaths(Wt::Dbo::Session& session);
 		static std::vector<pointer> getMBIDDuplicates(Wt::Dbo::Session& session);
 		static std::vector<pointer> getChecksumDuplicates(Wt::Dbo::Session& session);
@@ -158,8 +161,8 @@ class Track
 		void setArtist(Wt::Dbo::ptr<Artist> artist)			{ _artist = artist; }
 		void setRelease(Wt::Dbo::ptr<Release> release)			{ _release = release; }
 		void setGenres(std::vector<Genre::pointer> genres);
-		void addClassifification(Wt::Dbo::ptr<Classification> classification);
-		void addClassifificationData(Wt::Dbo::ptr<ClassificationData> classificationData);
+		void addClassification(Wt::Dbo::ptr<Classification> classification);
+		void addFeature(Wt::Dbo::ptr<Feature> feature);
 
 		int				getTrackNumber(void) const		{ return _trackNumber; }
 		int				getTotalTrackNumber(void) const		{ return _totalTrackNumber; }
@@ -180,7 +183,7 @@ class Track
 		std::vector< Genre::pointer >	getGenres(void) const;
 		bool				hasGenre(Genre::pointer genre) const	{ return _genres.count(genre); }
 		std::vector< Wt::Dbo::ptr<Classification> >	getClassifications(void) const;
-		std::vector< Wt::Dbo::ptr<ClassificationData> >	getClassificationData(void) const;
+		std::vector< Wt::Dbo::ptr<Feature> >	getFeatures(void) const;
 
 		template<class Action>
 			void persist(Action& a)
@@ -205,7 +208,7 @@ class Track
 				Wt::Dbo::hasMany(a, _genres, Wt::Dbo::ManyToMany, "track_genre", "", Wt::Dbo::OnDeleteCascade);
 				Wt::Dbo::hasMany(a, _playlistEntries, Wt::Dbo::ManyToOne, "track");
 				Wt::Dbo::hasMany(a, _classifications, Wt::Dbo::ManyToOne, "track");
-				Wt::Dbo::hasMany(a, _classificationData, Wt::Dbo::ManyToOne, "track");
+				Wt::Dbo::hasMany(a, _features, Wt::Dbo::ManyToOne, "track");
 			}
 
 	private:
@@ -237,7 +240,7 @@ class Track
 		Wt::Dbo::collection< Genre::pointer >	_genres; // Genres that are related to this track
 		Wt::Dbo::collection< Wt::Dbo::ptr<PlaylistEntry> > _playlistEntries;
 		Wt::Dbo::collection< Wt::Dbo::ptr<Classification> > _classifications;
-		Wt::Dbo::collection< Wt::Dbo::ptr<ClassificationData> > _classificationData;
+		Wt::Dbo::collection< Wt::Dbo::ptr<Feature> > _features;
 };
 
 
diff --git a/src/logger/Logger.cpp b/src/logger/Logger.cpp
index 5c5dc72b..aa02485c 100644
--- a/src/logger/Logger.cpp
+++ b/src/logger/Logger.cpp
@@ -26,6 +26,7 @@ std::string getModuleName(Module mod)
 		case Module::AV:		return "AV";
 		case Module::COVER:		return "COVER";
 		case Module::DB:		return "DB";
+		case Module::CLASSIFICATION:	return "CLASSIFICATION";
 		case Module::DBUPDATER:	return "DB UPDATER";
 		case Module::MAIN:		return "MAIN";
 		case Module::METADATA:	return "METADATA";
diff --git a/src/logger/Logger.hpp b/src/logger/Logger.hpp
index b3b7b7a4..6c5b822d 100644
--- a/src/logger/Logger.hpp
+++ b/src/logger/Logger.hpp
@@ -38,6 +38,7 @@ enum class Severity
 enum class Module
 {
 	AV,
+	CLASSIFICATION,
 	COVER,
 	DB,
 	DBUPDATER,
diff --git a/src/main/main.cpp b/src/main/main.cpp
index 61557773..806ba1c7 100644
--- a/src/main/main.cpp
+++ b/src/main/main.cpp
@@ -28,6 +28,8 @@
 #include "image/Image.hpp"
 
 #include "database/DatabaseUpdater.hpp"
+#include "database/DatabaseClassifier.hpp"
+#include "feature/FeatureExtractor.hpp"
 #include "ui/LmsApplication.hpp"
 
 
@@ -53,18 +55,26 @@ int main(int argc, char* argv[])
 		Av::AvInit();
 		Av::Transcoder::init();
 		Database::Handler::configureAuth();
+		Feature::Extractor::init();
 
 		// Initializing a connection pool to the database that will be shared along services
 		std::unique_ptr<Wt::Dbo::SqlConnectionPool> connectionPool( Database::Handler::createConnectionPool("/var/lms/lms.db")); // TODO use $datadir from autotools
 
-		Database::Updater::instance().setConnectionPool(*connectionPool);
+		Database::Updater& dbUpdater = Database::Updater::instance();
+		dbUpdater.setConnectionPool(*connectionPool);
+
+		Database::Classifier dbClassifier(*connectionPool);
+
+		// Connect the classifier to the update events
+		dbUpdater.trackChanged().connect(std::bind(&Database::Classifier::processTrackUpdate, &dbClassifier, std::placeholders::_1, std::placeholders::_2));
+		dbUpdater.scanComplete().connect(std::bind(&Database::Classifier::processDatabaseUpdate, &dbClassifier, std::placeholders::_1));
 
 		// bind entry point
 		server.addEntryPoint(Wt::Application, boost::bind(UserInterface::LmsApplication::create, _1, boost::ref(*connectionPool)));
 
 		// Start
 		LMS_LOG(MAIN, INFO) << "Starting database updater...";
-		Database::Updater::instance().start();
+		dbUpdater.start();
 
 		LMS_LOG(MAIN, INFO) << "Starting server...";
 		server.start();
@@ -75,11 +85,10 @@ int main(int argc, char* argv[])
 
 		// Stop
 		LMS_LOG(MAIN, INFO) << "Stopping server...";
-		Database::Updater::instance().stop();
+		server.stop();
 
 		LMS_LOG(MAIN, INFO) << "Stopping database updater...";
-		Database::Updater::instance().stop();
-
+		dbUpdater.stop();
 
 		res = EXIT_SUCCESS;
 	}
diff --git a/src/utils/Checksum.cpp b/src/utils/Path.cpp
similarity index 71%
rename from src/utils/Checksum.cpp
rename to src/utils/Path.cpp
index ad52914b..9921bd65 100644
--- a/src/utils/Checksum.cpp
+++ b/src/utils/Path.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Emeric Poupon
+ * Copyright (C) 2016 Emeric Poupon
  *
  * This file is part of LMS.
  *
@@ -21,10 +21,36 @@
 #include <stdexcept>
 
 #include <boost/crc.hpp>  // for boost::crc_32_type
+#include <boost/tokenizer.hpp>
 
 #include "logger/Logger.hpp"
 
-#include "Checksum.hpp"
+#include "Path.hpp"
+
+boost::filesystem::path searchExecPath(std::string filename)
+{
+	std::string path;
+
+	path = ::getenv("PATH");
+	if (path.empty())
+		throw std::runtime_error("Environment variable PATH not found");
+
+	std::string result;
+	typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
+	boost::char_separator<char> sep(":");
+	tokenizer tok(path, sep);
+	for (tokenizer::iterator it = tok.begin(); it != tok.end(); ++it)
+	{
+		boost::filesystem::path p = *it;
+		p /= filename;
+		if (!::access(p.c_str(), X_OK))
+		{
+			result = p.string();
+			break;
+		}
+	}
+	return result;
+}
 
 typedef boost::crc_32_type crc_type;
 
@@ -60,6 +86,4 @@ void computeCrc(const boost::filesystem::path& p, std::vector<unsigned char>& cr
 		const unsigned char* data = reinterpret_cast<const unsigned char*>( &checksum );
 		crc.push_back(data[i]);
 	}
-
 }
-
diff --git a/src/utils/Checksum.hpp b/src/utils/Path.hpp
similarity index 85%
rename from src/utils/Checksum.hpp
rename to src/utils/Path.hpp
index 214c3dad..96e4726e 100644
--- a/src/utils/Checksum.hpp
+++ b/src/utils/Path.hpp
@@ -1,5 +1,6 @@
+
 /*
- * Copyright (C) 2013 Emeric Poupon
+ * Copyright (C) 2016 Emeric Poupon
  *
  * This file is part of LMS.
  *
@@ -17,9 +18,12 @@
  * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
+#include <string>
 #include <vector>
 #include <boost/filesystem.hpp>
 
-// TODO move to utils
-void computeCrc(const boost::filesystem::path& p, std::vector<unsigned char>& checksum);
+boost::filesystem::path searchExecPath(std::string filename);
 
+void computeCrc(const boost::filesystem::path& p, std::vector<unsigned char>& checksum);