public float[] getFeatures(IWindowData windowData) {
float[] data = windowData.getData(0);
float mean = mean(data);
float stdev = stDev(mean, data);
float[] fftMag = getFFTMag(data);
float meanFftMag = mean(fftMag);
float stDevFftMag = stDev(meanFftMag, fftMag);
// prev state
float notMoving = 0, cruise = 0, accelerating = 0, breaking = 0;
int prevState = (int) (windowData.getData(1)[0]);
if (prevState == SvmRecognizerIntentService.NOT_MOVING) {
notMoving = 1;
} else if (prevState == SvmRecognizerIntentService.CRUISE) {
cruise = 1;
} else if (prevState == SvmRecognizerIntentService.ACCELERATING) {
accelerating = 1;
} else if (prevState == SvmRecognizerIntentService.BREAKING) {
breaking = 1;
}
return new float[] {
mean, stdev, meanFftMag, stDevFftMag,
notMoving, cruise, accelerating, breaking
};
}
public static boolean generateTrainingFile(
String sensorDataFolder,
String sensorDataFile,
String sensorMarksFolder,
String sensorMarksFile,
String outFolder,
String outFile,
Context context) {
IWindowData windowData = new WindowHalfOverlap(128);
IFeatures myFeatures = new MyFeatures();
Scanner scanSD = null, scanSM = null;
File sensorData = MyUtil.getSDFile(sensorDataFolder, sensorDataFile);
File sensorMarks = MyUtil.getSDFile(sensorMarksFolder, sensorMarksFile);
try {
scanSD = new Scanner(sensorData);
scanSD.useLocale(Locale.US);
} catch (FileNotFoundException e1) {
return false;
}
try {
scanSM = new Scanner(sensorMarks);
scanSM.useLocale(Locale.US);
} catch (FileNotFoundException e1) {
scanSD.close();
return false;
}
// progress bar
int total = getNumberOfLines(sensorData);
/*
int total = 0;
float mean = 0;
boolean correct = getNumberOfLines(sensorData, total, mean);
if(!correct){
scanSM.close();
scanSD.close();
return false;
}
Intent intent = new Intent("com.example.activityregistrator.UPDATE_HZ");
intent.putExtra("hz", 1/mean);
context.sendBroadcast(intent);
*/
float done = 0;
Long prevTimeSM, postTimeSM, timeSD = -1l, lastTimeSD = 0l, firstTimeSD = -1l;
int prevLabel, postLabel;
if (scanSM.hasNextLine()) {
scanSM.nextLine();
prevTimeSM = scanSM.nextLong();
prevLabel = scanSM.nextInt();
scanSD.nextLine();
Intent intent = new Intent("com.example.activityregistrator.UPDATE_PROGRESS");
intent.putExtra("progress", (float) ((++done) / total) * 100);
context.sendBroadcast(intent);
// find next time and label
while (scanSM.hasNextLine()) {
scanSM.nextLine();
if (!scanSM.hasNextLong()) break;
Log.d(TAG, "prevTimeSM: " + prevTimeSM + "; prevLabel: " + prevLabel);
postTimeSM = scanSM.nextLong();
postLabel = scanSM.nextInt();
Log.d(TAG, "postTimeSM: " + postTimeSM + "; postLabel: " + postLabel);
// each window has unique label
windowData.clean();
// search windowData beginning
// assumption: register only label>0 --> IGNORE<=0
while (prevLabel > 0) {
if (timeSD < 0) {
if (!scanSD.hasNextLong()) {
break;
}
timeSD = scanSD.nextLong();
}
// used to calculate hz
lastTimeSD = timeSD;
if (firstTimeSD < 0) firstTimeSD = timeSD;
if (timeSD >= prevTimeSM) {
if (timeSD <= postTimeSM) {
Log.d(TAG, "timeSD: " + timeSD);
// add x y z to windowData
float[] linearAccel = {scanSD.nextFloat(), scanSD.nextFloat(), scanSD.nextFloat()};
if (windowData.addData((float) vecLength(linearAccel))) {
// we have a complete windowData
// calculate features
float[] features = myFeatures.getFeatures(windowData);
// save to libsvm file with the correct label
String[] textToFile = new String[1];
textToFile[0] = prevLabel + " ";
for (int i = 0; i < features.length; i++) {
textToFile[0] += (i + 1) + ":" + features[i] + " ";
}
MyUtil.writeToSDFile(textToFile, outFolder, outFile, true);
}
if (scanSD.hasNextLine()) {
scanSD.nextLine();
intent = new Intent("com.example.activityregistrator.UPDATE_PROGRESS");
intent.putExtra("progress", (float) ((++done) / total) * 100);
context.sendBroadcast(intent);
timeSD = -1l; // get nextLong()
} else {
break;
}
} else {
break;
}
} else {
if (scanSD.hasNextLine()) {
scanSD.nextLine();
intent = new Intent("com.example.activityregistrator.UPDATE_PROGRESS");
intent.putExtra("progress", (float) ((++done) / total) * 100);
context.sendBroadcast(intent);
timeSD = -1l; // get nextLong()
} else {
break;
}
}
}
prevTimeSM = postTimeSM;
prevLabel = postLabel;
}
}
scanSD.close();
scanSM.close();
Intent intent = new Intent("com.example.activityregistrator.UPDATE_HZ");
intent.putExtra("hz", done / (((float) (lastTimeSD - firstTimeSD)) / 1000f));
context.sendBroadcast(intent);
Log.d(TAG, "[firstTimeSD,lastTimeSD,done]: " + firstTimeSD + " " + lastTimeSD + " " + done);
return true;
}