int Genome::CountGenes( int start, int finish )
{
int cnt = 0;
for(int cgI=1;cgI<=genes.size();++cgI)
if (min(genes(cgI)->indices) >= start && max(genes(cgI)->indices) <= finish)
cnt = cnt + 1;
return cnt;
}
// Insert a gene
bool DNA::insert_gene(unsigned int index, unsigned char* gene, unsigned int size) {
unsigned int amountgenes = genes();
assert(index < amountgenes);
// Case 1: gene at start
if (index == 0) {
if (amountgenes > 1) {
unsigned char* gene_mod = (unsigned char*) malloc((size+1) * sizeof(unsigned char));
memcpy(gene_mod, gene, size);
gene_mod[size] = 0;
insert(0, gene_mod, size+1);
free(gene_mod);
} else {
dataGenes = (unsigned char*) malloc(size * sizeof(unsigned char));
memcpy(dataGenes, gene, size);
dataSize = size;
}
}
// Case 2: gene at midst
else {
unsigned char* gene_mod = (unsigned char*) malloc((size+1) * sizeof(unsigned char));
memcpy(gene_mod, gene, size);
gene_mod[size] = 0;
unsigned int i_self = gene_start(index);
insert(i_self, gene_mod, size+1);
free(gene_mod);
}
return true;
}
// Erase a gene
bool DNA::erase_gene(unsigned int index) {
unsigned int amountgenes = genes();
assert(index < amountgenes);
// Case 1: gene at start
if (index == 0) {
if (amountgenes > 1) {
unsigned int i_next = gene_start(1);
erase(0, i_next);
} else {
free(dataGenes);
dataGenes = 0;
dataSize = 0;
}
}
// Case 2: gene at midst
else if (index < amountgenes-1) {
unsigned int i_self = gene_start(index);
unsigned int i_next = gene_start(index+1);
erase(i_self, i_next);
}
// Case 3: gene at end
else {
if (amountgenes > 1) {
unsigned int i_prev = gene_end(index-1);
erase(i_prev, dataSize);
} else {
free(dataGenes);
dataSize = 0;
}
}
return true;
}
// Returns a boolean value - tells us if we can cut the genome at given
// position.
bool Genome::CanCut(int location) {
for(int i=1;i<=genes.size();i++) {
Feature* g = genes(i);
if (min(g->indices) <= location && location <= max(g->indices))
return false;
}
return true;
}
void DNA::debug() const
{
// Debug message
std::cout << "* DNA.debug" << std::endl;
// Process chararray
std::cout << "Contents of DNA object (" << genes() << " genes): " << std::endl;
for (unsigned int i = 0; i < genes(); i++) {
std::cout << "\tgene " << i+1 << ":";
unsigned int start = gene_start(i);
unsigned int end = gene_end(i);
while (start < end) {
std::cout << " 0x" << std::hex << std::setfill('0') << std::setw(2) << (int)dataGenes[start++] << std::dec;
}
std::cout << std::endl;
}
}
// Extract a gene
bool DNA::extract_gene(unsigned int index, unsigned char*& gene, unsigned int& size) const {
unsigned int amountgenes = genes();
assert(index < amountgenes);
unsigned int i_start = gene_start(index);
unsigned int i_end = gene_end(index);
size = i_end-i_start;
extract(i_start, i_end, gene);
return true;
}
// Replace a gene
bool DNA::replace_gene(unsigned int index, unsigned char* gene, unsigned int size) {
unsigned int amountgenes = genes();
assert(index < amountgenes);
if (!erase_gene(index))
return false;
if (index < amountgenes-1)
return insert_gene(index, gene, size);
else
return push_back_gene(gene, size);
}
RankTransformer(const std::string& aMatrixDir, const std::string& aOutputfile,
bool aQuantileNormalisation = false, bool aUseInverse = false,
bool aScramble = false)
: mMatrixDir(aMatrixDir), mOutputFile(NULL), mData(NULL), mBuf(NULL),
mRanks(NULL), mInvRanks(NULL), mRankAvgs(NULL), mRankCounts(NULL),
mQuantileNormalisation(aQuantileNormalisation), mUseInverse(aUseInverse),
mScramble(aScramble)
{
mOutputFile = fopen(aOutputfile.c_str(), "w");
fs::path data(mMatrixDir);
if (mUseInverse)
data /= "inverse_data";
else
data /= "data";
mData = fopen(data.string().c_str(), "r");
fs::path genes(mMatrixDir);
// Ugly hack: if we are using the inverted data, we simply swap out the
// list of genes for the list of arrays, so that nGenes is actually the
// number of arrays. This means that the normalisation occurs as normal,
// except for each gene across arrays instead of for each array across
// genes.
if (mUseInverse)
genes /= "arrays";
else
genes /= "genes";
nGenes = 0;
std::ifstream gs(genes.string().c_str());
while (gs.good())
{
std::string l;
std::getline(gs, l);
if (!gs.good())
break;
nGenes++;
}
mBuf = new double[nGenes];
mRanks = new double[nGenes];
if (mQuantileNormalisation)
{
mRankAvgs = new double[nGenes];
mRankCounts = new uint32_t[nGenes];
memset(mRankAvgs, 0, sizeof(double) * nGenes);
memset(mRankCounts, 0, sizeof(uint32_t) * nGenes);
}
mInvRanks = new uint32_t[nGenes];
processAllData();
}
// Add a gene
bool DNA::push_back_gene(unsigned char* gene, unsigned int size) {
unsigned int amountgenes = genes();
if (amountgenes == 0)
push_back(gene, size);
else {
unsigned char* gene_mod = (unsigned char*) malloc((size+1) * sizeof(unsigned char));
memcpy(gene_mod+1, gene, size);
gene_mod[0] = 0;
push_back(gene_mod, size+1);
free(gene_mod);
}
return true;
}
mvec<Genome*> Genome::Split( float wanted_ratio, int impTh )
{
/*
% For each gene go and try to divide the genome after each gene, make
% sure we do not cut any genes in the middle and select the ratio
% closest to 0.5 */
float best_ratio = FLT_MAX;
int best_position = 0;
int n = genes.size();
int last_impI = 0;
int last_impJ = 0;
int i = (int)(n * wanted_ratio + 0.5f) - 1;
int j = (int)(n * wanted_ratio + 0.5f);
while ((i > 0 && last_impI < impTh) || (j < n && last_impJ < impTh))
{
if (i > 0 && last_impI < impTh) {
Feature* cur = genes(i);
Feature* next = genes(i + 1);
int cur_end = max(cur->indices);
int next_start = min(next->indices);
int middle = round(0.5 * (cur_end+next_start));
if (CanCut(middle)) {
float ratio = CountGenes(1, middle) / (float)n;
if (fabsf(ratio - wanted_ratio) < fabsf(best_ratio - wanted_ratio)) {
best_ratio = ratio;
d_trace("[+] (%d) New best ratio attained - %f\n", i, best_ratio);
best_position = middle;
last_impI = 0;
} else {
last_impI = last_impI + 1;
}
}
}
i--;
if (j < n && last_impJ < impTh) {
Feature* cur = genes(j);
Feature* next = genes(j + 1);
int cur_end = max(cur->indices);
int next_start = min(next->indices);
int middle = round(0.5 * (cur_end+next_start));
if (CanCut(middle)) {
float ratio = CountGenes(1, middle) / (float) n;
if (fabsf(ratio - wanted_ratio) < fabsf(best_ratio - wanted_ratio)) {
best_ratio = ratio;
d_trace("[+] (%d) New best ratio attained - %f\n", i, best_ratio);
best_position = middle;
last_impJ = 0;
} else {
last_impJ = last_impJ + 1;
}
}
}
j++;
}
// % BTW, this works only coz the genes are sorted in incresing order of
// % their lower index (lower != first)
d_trace("[i] Cutting sequence at %d\n", best_position);
mvec<Genome*> r;
r.push_back(GetSubset(1, best_position)); // train
// train.Sequence = g.Sequence(1:best_position);
//train.gene = get_all_genes(f, 1, best_position);
r.push_back(GetSubset(best_position + 1, sequence.size()));
// test.Sequence = g.Sequence(best_position + 1:seq_length);
// test.gene = get_all_genes(f, best_position + 1, seq_length);
// test.gene = shift_genes(test.gene, best_position);
return r;
}
Merz1999Solution::Merz1999Solution(const QUBOInstance& qi,
const Merz1999Solution& parent_a,
const Merz1999Solution& parent_b,
QUBOHeuristic *heuristic) :
QUBOSolution(parent_a) {
// Implements the HUX cross over with restricted local search
// Store the bits which were identical with parents before commencing local search.
std::vector<bool> parents_identical(N_, false);
// http://en.wikipedia.org/wiki/Crossover_(genetic_algorithm)#Uniform_Crossover_and_Half_Uniform_Crossover
// In the half uniform crossover scheme (HUX), exactly half of the
// nonmatching bits are swapped. Thus first the Hamming distance (the
// number of differing bits) is calculated. This number is divided by two.
// The resulting number is how many of the bits that do not match between
// the two parents will be swapped.
int half_hamming_distance = parent_a.SymmetricDifference(parent_b) / 2;
std::vector<int> genes(N_, 0);
for (int i = 0; i < N_; i++)
genes[i] = i;
// Pick random ordering of genes
std::random_shuffle(genes.begin(), genes.end());
int left_to_swap = half_hamming_distance;
const std::vector<int>& a_genes = parent_a.get_assignments();
const std::vector<int>& b_genes = parent_b.get_assignments();
for (int pos = 0; pos < N_; pos++) {
int i = genes[pos];
if (a_genes[i] == b_genes[i]) {
// Parents are the same in this gene
parents_identical[i] = true;
} else {
// Parents are different in this gene
// The wikipedia page is confusing because it talks about two children
// But the paper only has one
// So, by default we'll take the father
if (left_to_swap > 0) {
UpdateCutValues(i);
--left_to_swap;
}
}
}
// We now have some combination of the parents, now do the local search
// PAPER: The local search applied to the resulting offspring after
// recombination is restricted to a region of the search space
// defined by the two parents: the genes with equal values in
// the two parents are not modified during local search.
while (1) {
double best_move = 0.0;
int best_pos = -1;
for (int i=0; i < N_; ++i) {
if (parents_identical[i]) continue; // Only modification
if (diff_weights_[i] > best_move) {
best_move = diff_weights_[i];
best_pos = i;
}
}
if (best_pos < 0 || !ImprovingMove(best_pos)) {
// No more profitable moves
break;
}
// Update the diff_weights_ variable and objective
UpdateCutValues(best_pos);
}
}
// Returns the index of the last data part of a gene (exclusive)
// NOTE: this value is not guaranteed to be accessible!
unsigned int DNA::gene_end(unsigned int index) const {
if (index < genes()-1)
return separator(index+1);
else
return dataSize;
}
