SwipeDetector.cpp

/*
GRT MIT License
Copyright (c) <2012> <Nicholas Gillian, Media Lab, MIT>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
and associated documentation files (the "Software"), to deal in the Software without restriction, 
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial 
portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#define GRT_DLL_EXPORTS
#include "SwipeDetector.h"

GRT_BEGIN_NAMESPACE

//Define the string that will be used to identify the object
const std::string SwipeDetector::id = "SwipeDetector";
std::string SwipeDetector::getId() { return SwipeDetector::id; }

//Register the SwipeDetector module with the Classifier base class
RegisterClassifierModule< SwipeDetector > SwipeDetector::registerModule( SwipeDetector::getId() );

SwipeDetector::SwipeDetector(const unsigned int swipeIndex, const unsigned int swipeThreshold,
 const unsigned int hysteresisThreshold, const unsigned int swipeDirection,bool useScaling) : Classifier( SwipeDetector::getId() )
{
 this->swipeIndex = swipeIndex;
 this->swipeThreshold = swipeThreshold;
 this->hysteresisThreshold = hysteresisThreshold;
 this->swipeDirection = swipeDirection;
 this->useScaling = useScaling;
 
 supportsNullRejection = false;
 contextInput = true;
 classifierMode = STANDARD_CLASSIFIER_MODE;
 
 swipeIntegrationCoeff = 0.92;
 movementIntegrationCoeff = 0.90;
 movementThreshold = 3000;
 contextFilterSize = 5;
 
 reset();
}
 
SwipeDetector::SwipeDetector(const SwipeDetector &rhs) : Classifier( SwipeDetector::getId() )
{
 supportsNullRejection = false;
 classifierMode = STANDARD_CLASSIFIER_MODE;
 
 swipeIntegrationCoeff = 0.92;
 movementIntegrationCoeff = 0.90;
 movementThreshold = 3000;
 contextFilterSize = 5;
 
 *this = rhs;
}

SwipeDetector::~SwipeDetector(void)
{
}
 
SwipeDetector& SwipeDetector::operator=(const SwipeDetector &rhs){
 if( this != &rhs ){
 //SwipeDetector variables
 this->firstSample = rhs.firstSample;
 this->swipeDetected = rhs.swipeDetected;
 this->contextInput = rhs.contextInput;
 this->swipeIndex = rhs.swipeIndex;
 this->swipeDirection = rhs.swipeDirection;
 this->contextFilterSize = rhs.contextFilterSize;
 this->swipeIntegrationCoeff = rhs.swipeIntegrationCoeff;
 this->movementIntegrationCoeff = rhs.movementIntegrationCoeff;
 this->swipeThreshold = rhs.swipeThreshold;
 this->hysteresisThreshold = rhs.hysteresisThreshold;
 this->swipeVelocity = rhs.swipeVelocity;
 this->movementVelocity = rhs.movementVelocity;
 this->movementThreshold = rhs.movementThreshold;
 this->contextFilteredValue = rhs.contextFilteredValue;
 this->lastX = rhs.lastX;
 this->thresholdDetector = rhs.thresholdDetector;
 this->contextFilter = rhs.contextFilter;
 
 //Classifier variables
 copyBaseVariables( (Classifier*)&rhs );
 }
 return *this;
}
 
bool SwipeDetector::deepCopyFrom(const Classifier *classifier){
 
 if( classifier == NULL ) return false;
 
 if( this->getId() == classifier->getId() ){
 
 const SwipeDetector *ptr = dynamic_cast<const SwipeDetector*>(classifier);
 
 this->firstSample = ptr->firstSample;
 this->swipeDetected = ptr->swipeDetected;
 this->contextInput = ptr->contextInput;
 this->swipeIndex = ptr->swipeIndex;
 this->swipeDirection = ptr->swipeDirection;
 this->contextFilterSize = ptr->contextFilterSize;
 this->swipeIntegrationCoeff = ptr->swipeIntegrationCoeff;
 this->movementIntegrationCoeff = ptr->movementIntegrationCoeff;
 this->swipeThreshold = ptr->swipeThreshold;
 this->hysteresisThreshold = ptr->hysteresisThreshold;
 this->swipeVelocity = ptr->swipeVelocity;
 this->movementVelocity = ptr->movementVelocity;
 this->movementThreshold = ptr->movementThreshold;
 this->contextFilteredValue = ptr->contextFilteredValue;
 this->lastX = ptr->lastX;
 this->thresholdDetector = ptr->thresholdDetector;
 this->contextFilter = ptr->contextFilter;
 
 //Classifier variables
 return copyBaseVariables( classifier );
 }
 
 return false;
}
 
bool SwipeDetector::init(const unsigned int numInputDimensions){
 
 //Clear any previous models
 clear();
 
 this->numInputDimensions = numInputDimensions;
 numClasses = 2; //This is always 2 for swipe detection [1 == swipe detected, everything else means no swipe detected]
 classLabels.resize( 2 );
 classLabels[0] = 1; //Swipe
 classLabels[1] = 2; //No Swipe
 nullRejectionThresholds.resize(2,0);
 
 //We currently have no way to automatically train the swipe detection, user needs to manually set thresholds, so just flag the model is trained
 trained = true;
 
 return true;
}
 
bool SwipeDetector::train_(ClassificationData &trainingData){
 
 //Clear any previous models
 clear();
 
 const unsigned int M = trainingData.getNumSamples();
 const unsigned int N = trainingData.getNumDimensions();
 
 if( M == 0 ){
 errorLog << __GRT_LOG__ << " Training data has zero samples!" << std::endl;
 return false;
 }
 
 numInputDimensions = N;
 numClasses = 2; //This is always 2 for swipe detection [1 == swipe detected, everything else means no swipe detected]
 classLabels.resize( 2 );
 classLabels[0] = 1; //Swipe
 classLabels[1] = 2; //No Swipe
 nullRejectionThresholds.resize(2,0);
 ranges = trainingData.getRanges();
 
 //Scale the training data if needed
 if( useScaling ){
 //Scale the training data between 0 and 1
 trainingData.scale(0, 1);
 }
 
 //We currently have no way to automatically train the swipe detection, user needs to manually set thresholds, so just flag the model is trained
 trained = true;
 
 return true;
}
 

bool SwipeDetector::predict_(VectorDouble &inputVector){
 
 predictedClassLabel = 0;
 maxLikelihood = 0;
 swipeDetected = false;
 
 if( !trained ){
 errorLog << __GRT_LOG__ << " SwipeDetector Model Not Trained!" << std::endl;
 return false;
 }
 
 if( inputVector.getSize() != numInputDimensions ){
 errorLog << __GRT_LOG__ << " The size of the input vector (" << inputVector.getSize() << ") does not match the num features in the model (" << numInputDimensions << ")" << std::endl;
 return false;
 }
 
 if( useScaling ){
 for(UINT n=0; n<numInputDimensions; n++){
 inputVector[n] = scale(inputVector[n], ranges[n].minValue, ranges[n].maxValue, 0, 1);
 }
 }
 
 if( classLikelihoods.size() != numClasses ) classLikelihoods.resize(numClasses,0);
 if( classDistances.size() != numClasses ) classDistances.resize(numClasses,0);
 
 //Compute the integrated movement velocity for the none-swipe dimensions
 if( !firstSample ){
 movementVelocity *= movementIntegrationCoeff;
 for(unsigned int i=0; i<numInputDimensions; i++){
 if( i != swipeIndex )
 movementVelocity += GRT::SQR(inputVector[i]-lastX[i]);
 }
 }else firstSample = false;
 lastX = inputVector;
 
 //Compute the integrated swipe velocity and update the threshold detector
 swipeVelocity = (swipeVelocity*swipeIntegrationCoeff) + inputVector[swipeIndex];
 thresholdDetector.update( swipeVelocity );
 
 //Filter the context
 contextFilteredValue = contextFilter.filter( contextInput ? 1 : 0 );
 
 //Check if a swipe has been detected
 swipeDetected = thresholdDetector.getThresholdCrossingDetected() && movementVelocity < movementThreshold && contextFilteredValue == 1;

 if( swipeDetected ){
 predictedClassLabel = 1;
 classLikelihoods[0] = 1.0;
 classDistances[1] = 0;
 }else{
 predictedClassLabel = 2;
 classLikelihoods[0] = 0.0;
 classDistances[1] = 1;
 }
 
 return true;
}
 
bool SwipeDetector::clear(){
 
 //Clear the Classifier variables
 Classifier::clear();
 
 reset();
 
 return true;
}
 
bool SwipeDetector::reset(){
 
 movementVelocity = 0;
 lastX.clear();
 lastX.resize( 3, 0 );
 firstSample = true;
 swipeDetected = false;
 contextInput = true;
 
 if( swipeDirection == POSITIVE_SWIPE ){
 thresholdDetector.setThresholdCrossingMode( GRT::ThresholdCrossingDetector::UPPER_THRESHOLD_CROSSING );
 thresholdDetector.setUpperThreshold( swipeThreshold );
 }
 if( swipeDirection == NEGATIVE_SWIPE ){
 thresholdDetector.setThresholdCrossingMode( GRT::ThresholdCrossingDetector::LOWER_THRESHOLD_CROSSING );
 thresholdDetector.setLowerThreshold( swipeThreshold );
 }
 
 thresholdDetector.setAnalysisMode( GRT::ThresholdCrossingDetector::DERIVATIVE_ANALYSIS_MODE );
 thresholdDetector.setDetectionTimeoutMode( GRT::ThresholdCrossingDetector::HYSTERESIS_THRESHOLD );
 thresholdDetector.setHysteresisThreshold( hysteresisThreshold );
 
 contextFilter.init( contextFilterSize, 1 );
 
 return true;
}
 
bool SwipeDetector::save( std::fstream &file ) const{
 
 if(!file.is_open())
 {
 errorLog << __GRT_LOG__ << " The file is not open!" << std::endl;
 return false;
 }
 
 //Write the header info
 file<<"GRT_SWIPE_DETECTION_MODEL_FILE_V1.0\n";
 
 //Write the classifier settings to the file
 if( !Classifier::saveBaseSettingsToFile(file) ){
 errorLog << __GRT_LOG__ << " Failed to save classifier base settings to file!" << std::endl;
 return false;
 }
 
 if( trained ){
 
 file << "SwipeIndex: " << swipeIndex << std::endl;
 file << "ContextFilterSize: " << contextFilterSize << std::endl;
 file << "SwipeIntegrationCoeff: " << swipeIntegrationCoeff << std::endl;
 file << "MovementIntegrationCoeff: " << movementIntegrationCoeff << std::endl;
 file << "SwipeThreshold: " << swipeThreshold << std::endl;
 
 file << "HysteresisThreshold: " << hysteresisThreshold << std::endl;
 file << "SwipeThreshold: " << swipeThreshold << std::endl;
 file << "MovementThreshold: " << movementThreshold << std::endl;
 file << "SwipeThreshold: " << swipeThreshold << std::endl;
 
 //TODO - need to save the thresholdDetector
 
 }
 
 return true;
}
 
bool SwipeDetector::load( std::fstream &file ){
 
 trained = false;
 numInputDimensions = 0;
 numClasses = 0;
 classLabels.clear();
 
 if(!file.is_open())
 {
 errorLog << __GRT_LOG__ << " Could not open file to load model" << std::endl;
 return false;
 }
 
 std::string word;
 
 file >> word;

 //Find the file type header
 if(word != "GRT_SWIPE_DETECTION_MODEL_FILE_V1.0"){
 errorLog << __GRT_LOG__ << " Could not find Model File Header" << std::endl;
 return false;
 }
 
 //Load the base settings from the file
 if( !Classifier::loadBaseSettingsFromFile(file) ){
 errorLog << __GRT_LOG__ << " Failed to load base settings from file!" << std::endl;
 return false;
 }
 
 if( trained ){
 
 file >> word;
 if( word != "SwipeIndex:" ){
 errorLog << __GRT_LOG__ << " Could not load the SwipeIndex!" << std::endl;
 return false;
 }
 file >> swipeIndex;
 
 file >> word;
 if( word != "ContextFilterSize:" ){
 errorLog << __GRT_LOG__ << " Could not load the ContextFilterSize!" << std::endl;
 return false;
 }
 file >> contextFilterSize;
 
 file >> word;
 if( word != "SwipeIntegrationCoeff:" ){
 errorLog << __GRT_LOG__ << " Could not load the SwipeIntegrationCoeff!" << std::endl;
 return false;
 }
 file >> swipeIntegrationCoeff;
 
 file >> word;
 if( word != "MovementIntegrationCoeff:" ){
 errorLog << __GRT_LOG__ << " Could not load the MovementIntegrationCoeff!" << std::endl;
 return false;
 }
 file >> movementIntegrationCoeff;
 
 file >> word;
 if( word != "SwipeThreshold:" ){
 errorLog << __GRT_LOG__ << " Could not load the SwipeThreshold!" << std::endl;
 return false;
 }
 file >> swipeThreshold;
 
 file >> word;
 if( word != "HysteresisThreshold:" ){
 errorLog << __GRT_LOG__ << " Could not load the HysteresisThreshold!" << std::endl;
 return false;
 }
 file >> hysteresisThreshold;
 
 file >> word;
 if( word != "SwipeThreshold:" ){
 errorLog << __GRT_LOG__ << " Could not load the SwipeThreshold!" << std::endl;
 return false;
 }
 file >> swipeThreshold;
 
 file >> word;
 if( word != "MovementThreshold:" ){
 errorLog << __GRT_LOG__ << " Could not load the MovementThreshold!" << std::endl;
 return false;
 }
 file >> movementThreshold;
 
 //Resize the prediction results to make sure it is setup for realtime prediction
 maxLikelihood = DEFAULT_NULL_LIKELIHOOD_VALUE;
 bestDistance = DEFAULT_NULL_DISTANCE_VALUE;
 classLikelihoods.resize(numClasses,DEFAULT_NULL_LIKELIHOOD_VALUE);
 classDistances.resize(numClasses,DEFAULT_NULL_DISTANCE_VALUE);
 
 reset();
 }
 
 return true;
}
 
 
bool SwipeDetector::getSwipeDetected() const {
 return swipeDetected;
}

Float SwipeDetector::getSwipeValue() const {
 return thresholdDetector.getAnalysisValue();
}

Float SwipeDetector::getSwipeThreshold() const {
 return swipeThreshold;
}
 
Float SwipeDetector::getHysteresisThreshold() const{
 return hysteresisThreshold;
}

Float SwipeDetector::getMovementVelocity() const {
 return movementVelocity;
}

Float SwipeDetector::getMovementThreshold() const {
 return movementThreshold;
}

Float SwipeDetector::getContextValue() const {
 return contextFilteredValue;
}

Float SwipeDetector::getSwipeIntegrationCoeff() const{
 return swipeIntegrationCoeff;
}
 
bool SwipeDetector::setContext(const bool context){
 this->contextInput = context;
 return true;
}

bool SwipeDetector::setSwipeIndex(const unsigned int swipeIndex){
 this->swipeIndex = swipeIndex;
 reset();
 return true;
}

bool SwipeDetector::setSwipeDirection(const unsigned int swipeDirection){
 
 if( swipeDirection != POSITIVE_SWIPE && swipeDirection != NEGATIVE_SWIPE ){
 errorLog << __GRT_LOG__ << " Unknown swipeDirection!" << std::endl;
 return false;
 }
 
 this->swipeDirection = swipeDirection;
 reset();
 
 return true;
}

bool SwipeDetector::setSwipeThreshold(const Float swipeThreshold){
 this->swipeThreshold = swipeThreshold;
 reset();
 return true;
}

bool SwipeDetector::setHysteresisThreshold(const Float hysteresisThreshold){
 this->hysteresisThreshold = hysteresisThreshold;
 reset();
 return true;
}

bool SwipeDetector::setMovementThreshold(const Float movementThreshold){
 this->movementThreshold = movementThreshold;
 reset();
 return true;
}

bool SwipeDetector::setSwipeIntegrationCoeff(const Float swipeIntegrationCoeff){
 this->swipeIntegrationCoeff = swipeIntegrationCoeff;
 reset();
 return true;
}

GRT_END_NAMESPACE