void BackProp::createLayers(const Matrix& features, Matrix& labels)
{
assert(labels.cols() == 1);
// create the layers
std::vector<size_t> layerConfig;
size_t nInputs = features.cols();
layerConfig.push_back(nInputs);
size_t firstLayer = nInputs;
layerConfig.push_back(firstLayer);
//size_t hiddenLayer = firstLayer * 2;
//size_t hiddenLayer = 16384;
size_t hiddenLayer = _nHidden;
layerConfig.push_back(hiddenLayer);
size_t outputUnits = 0;
for(size_t i = 0; i < labels.cols(); i++)
outputUnits += (labels.valueCount(i) > 0 ? labels.valueCount(i) : 1);
layerConfig.push_back(outputUnits);
if(_loggingOn)
std::cout << "Creating network of layers..." << std::endl;
if(_layers != NULL)
delete _layers;
assert(layerConfig.size() > 1);
_nLayers = layerConfig.size() - 1;
_layers = new BackPropLayer[_nLayers];
for(size_t i = 1; i < layerConfig.size(); i++)
{
assert(layerConfig[i] > 0);
size_t layerIndex = i - 1;
_layers[layerIndex] = BackPropLayer(&_rand, layerConfig[i], layerIndex, _learningRate, _momentum, _loggingOn);
if(layerIndex == 0)
{
size_t inputLayerConfig = 0;
_layers[layerIndex].setNumInputs(layerConfig[inputLayerConfig]);
}
}
connectLayers(_layers, _nLayers);
for(size_t i = 0; i < _nLayers; i++)
_layers[i].setRandomWeights();
assert(_nLayers > 0);
assert(features.cols() == _layers[0].getNumUnits());
}
NetworkImpl(const vector<unsigned> &layerSizes) {
assert(layerSizes.size() >= 2);
layers.reserve(layerSizes.size());
// Create the layers.
for (unsigned i = 0; i < layerSizes.size(); i++) {
NeuronType layerType =
(i == 0) ? NeuronType::INPUT :
(i == layerSizes.size() - 1) ? NeuronType::OUTPUT :
NeuronType::INTERNAL;
layers.emplace_back(layerType, layerSizes[i]);
}
// Connect the layers.
for (unsigned i = 0; i < layers.size()-1; i++) {
connectLayers(layers[i], layers[i+1]);
}
}
void BackProp::copyLayers(const BackPropLayer src[], size_t srcLen, BackPropLayer** dest, size_t& destLen)
{
assert(src != NULL);
assert(srcLen > 0);
if(*dest != NULL)
delete [] *dest;
*dest = NULL;
assert(srcLen > 0);
*dest = new BackPropLayer[srcLen];
destLen = srcLen;
for(size_t i = 0; i < srcLen; i++)
{
(*dest)[i].setNumUnits(src[i].getNumUnits());
(*dest)[i].setLayerId(i);
}
connectLayers(*dest, destLen);
for(size_t i = 0; i < srcLen; i++)
(*dest)[i].copyLayerUnits(src[i]);
}
