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/*Copyright 2009 Alex Graves

This file is part of RNNLIB.

RNNLIB 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.

RNNLIB 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 RNNLIB. If not, see <http://www.gnu.org/licenses/>.*/

#ifndef _INCLUDED_WeightContainer_h
#define _INCLUDED_WeightContainer_h

#include <vector>
#include <numeric>
#include <algorithm>
#include <functional>
#include <math.h>
#include <boost/tuple/tuple.hpp>
#include "Random.hpp"
#include "DataExporter.hpp"

using namespace std;

typedef multimap<string, tuple<string, string, int, int> >::iterator WC_CONN_IT;

struct WeightContainer: public DataExporter
{
//data
vector<double> weights;
vector<double> derivatives;
vector<double> plasticities;
multimap<string, tuple<string, string, int, int> > connections;

//functions
WeightContainer():
DataExporter("weightContainer")
{
}
static WeightContainer& instance()
{
static WeightContainer wc;
return wc;
}
void link_layers(const string& fromName, const string& toName, const string& connName = "", int paramBegin = -1, int paramEnd = -1)
{
connections.insert(make_pair(toName, make_tuple(fromName, connName, paramBegin, paramEnd)));
}
pair<size_t, size_t> new_parameters(size_t numParams, const string& fromName, const string& toName, const string& connName)
{
size_t begin = weights.size();
weights.resize(weights.size() + numParams);
size_t end = weights.size();
link_layers(fromName, toName, connName, begin, end);
return make_pair(begin, end);
}
View<double> get_weights(pair<int, int> range)
{
return View<double>(&weights[range.first], &weights[range.second]);
}
View<double> get_derivs(pair<int, int> range)
{
return View<double>(&derivatives[range.first], &derivatives[range.second]);
}
View<double> get_plasts(pair<int, int> range)
{
return View<double>(&plasticities[range.first], &plasticities[range.second]);
}
void randomise(double range)
{
loop(double& w, weights)
{
if (w == infinity)
{
w = Random::normal() * range;
}
}
}
void reset_derivs()
{
fill(derivatives, 0);
}
void save_by_conns(vector<double>& container, const string& nam)
{
for (WC_CONN_IT it = connections.begin(); it != connections.end(); ++it)
{
VDI begin = container.begin() + it->second.get<2>();
VDI end = container.begin() + it->second.get<3>();
if (begin != end)
{
save_range(make_pair(begin, end), it->second.get<1>() + "_" + nam);
}
}
}
//MUST BE CALLED BEFORE WEIGHT CONTAINER IS USED
void build()
{
fill(weights, infinity);
plasticities.resize(weights.size());
derivatives.resize(weights.size());
fill(plasticities, 1);
save_by_conns(weights, "weights");
save_by_conns(plasticities, "plasticities");
}
};

#endif
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