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#include "projectionobserver.h"
#include <algorithm>
#include <cmath>
#include "mp.h"
#include "numericrange.h"
ProjectionObserver::ProjectionObserver(const arma::mat &X,
const arma::uvec &cpIndices)
: m_type(ObserverCurrent)
, m_X(X)
, m_cpIndices(cpIndices)
, m_rpIndices(X.n_rows - cpIndices.n_elem)
, m_cpSelectionEmpty(true)
, m_rpSelectionEmpty(true)
, m_values(X.n_rows)
, m_prevValues(X.n_rows)
, m_firstValues(X.n_rows)
, m_hasFirst(false)
, m_hasPrev(false)
{
m_distX = mp::dist(m_X);
NumericRange<arma::uword> allIndices(0, m_X.n_rows);
std::set_symmetric_difference(allIndices.cbegin(), allIndices.cend(),
m_cpIndices.cbegin(), m_cpIndices.cend(), m_rpIndices.begin());
computeAlphas();
}
void ProjectionObserver::computeAlphas()
{
m_influences.set_size(m_X.n_rows);
m_alphas.set_size(m_rpIndices.n_elem, m_cpIndices.n_elem);
for (arma::uword i = 0; i < m_rpIndices.n_elem; i++) {
double sum = 0;
const arma::rowvec &x = m_X.row(m_rpIndices[i]);
for (arma::uword j = 0; j < m_cpIndices.n_elem; j++) {
double norm = arma::norm(x - m_X.row(m_cpIndices[j]));
m_alphas(i, j) = 1.0 / std::max(norm * norm, 1e-6);
sum += m_alphas(i, j);
}
for (arma::uword j = 0; j < m_cpIndices.n_elem; j++) {
m_alphas(i, j) /= sum;
}
}
}
void ProjectionObserver::undo()
{
if (m_hasPrev) {
m_hasPrev = false;
m_distY = m_prevDistY;
m_values = m_prevValues;
if (m_cpSelectionEmpty && m_rpSelectionEmpty) {
emitValuesChanged();
}
}
}
void ProjectionObserver::reset()
{
if (m_hasFirst) {
m_hasPrev = false;
m_distY = m_firstDistY;
m_values = m_firstValues;
if (m_cpSelectionEmpty && m_rpSelectionEmpty) {
emitValuesChanged();
}
}
}
void ProjectionObserver::addMap(const arma::mat &Y)
{
if (m_hasFirst) {
m_hasPrev = true;
m_prevDistY = m_distY;
m_prevValues = m_values;
}
m_distY = mp::dist(Y);
mp::aggregatedError(m_distX, m_distY, m_values);
if (!m_hasFirst) {
m_hasFirst = true;
m_firstDistY = m_distY;
m_firstValues = m_values;
}
if (m_cpSelectionEmpty && m_rpSelectionEmpty) {
emitValuesChanged();
}
}
bool ProjectionObserver::setType(ObserverType type)
{
if (m_type == type) {
return true;
}
if ((type == ObserverDiffPrevious && !m_hasPrev)
|| (type == ObserverDiffFirst && !m_hasFirst)) {
return false;
}
m_type = type;
if (!m_cpSelectionEmpty || !m_rpSelectionEmpty) {
// We changed our type, but cannot emit values since we have non-empty
// selections
return true;
}
return emitValuesChanged();
}
void ProjectionObserver::setCPSelection(const std::vector<bool> &cpSelection)
{
m_cpSelection.clear();
for (int i = 0; i < cpSelection.size(); i++) {
if (cpSelection[i]) {
m_cpSelection.push_back(i);
}
}
m_cpSelectionEmpty = m_cpSelection.empty();
if (!m_cpSelectionEmpty) {
// compute the influence of CP selection on each RP
for (arma::uword rp = 0; rp < m_rpIndices.n_elem; rp++) {
m_influences[m_rpIndices[rp]] = 0;
const arma::rowvec &row = m_alphas.row(rp);
for (auto cp: m_cpSelection) {
m_influences[m_rpIndices[rp]] += row[cp];
}
}
emit rpValuesChanged(m_influences(m_rpIndices));
} else {
emitValuesChanged();
}
}
void ProjectionObserver::setRPSelection(const std::vector<bool> &rpSelection)
{
m_rpSelection.clear();
for (int i = 0; i < rpSelection.size(); i++) {
if (rpSelection[i]) {
m_rpSelection.push_back(i);
}
}
m_rpSelectionEmpty = m_rpSelection.empty();
if (!m_rpSelectionEmpty) {
// compute how influent is each CP on RP selection
for (arma::uword cp = 0; cp < m_cpIndices.n_elem; cp++) {
m_influences[m_cpIndices[cp]] = 0;
for (auto rp: m_rpSelection) {
m_influences[m_cpIndices[cp]] += m_alphas(rp, cp);
}
}
emit cpValuesChanged(m_influences(m_cpIndices));
} else {
emit cpValuesChanged(arma::vec());
}
}
bool ProjectionObserver::emitValuesChanged() const
{
switch (m_type) {
case ObserverCurrent:
emit rpValuesChanged(m_values(m_rpIndices));
emit valuesChanged(m_values);
return true;
case ObserverDiffPrevious:
if (m_hasPrev) {
arma::vec diff = m_values - m_prevValues;
emit rpValuesChanged(diff(m_rpIndices));
emit valuesChanged(diff);
return true;
}
return false;
case ObserverDiffFirst:
if (m_hasFirst) {
arma::vec diff = m_values - m_firstValues;
emit rpValuesChanged(diff(m_rpIndices));
emit valuesChanged(diff);
return true;
}
return false;
default:
return false;
}
}
void ProjectionObserver::setRewind(double t)
{
if (!m_hasPrev || !m_cpSelectionEmpty || !m_rpSelectionEmpty) {
return;
}
arma::vec values = m_values * t + m_prevValues * (1.0 - t);
emit cpValuesRewound(values(m_cpIndices));
emit rpValuesRewound(values(m_rpIndices));
emit valuesRewound(values);
}
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