Use previous launched app as a additional feature
If location is unknown location feature is not used for prediction
Change-Id: Ib412a82452fc94c263d7cbd10225880c5389f0fb
diff --git a/bordeaux/learning/predictor_histogram/java/android/bordeaux/learning/HistogramPredictor.java b/bordeaux/learning/predictor_histogram/java/android/bordeaux/learning/HistogramPredictor.java
index e9490ce..cb962de 100644
--- a/bordeaux/learning/predictor_histogram/java/android/bordeaux/learning/HistogramPredictor.java
+++ b/bordeaux/learning/predictor_histogram/java/android/bordeaux/learning/HistogramPredictor.java
@@ -42,9 +42,11 @@
* for example, location, * time of day, etc. The histogram is kept in a two level hash table.
* The first level key is the feature value and the second level key is the app id.
*/
-
-// TODO: use forgetting factor to downweight istances propotional to the time
-// difference between the occurrance and now.
+// TODOS:
+// 1. Use forgetting factor to downweight istances propotional to the time
+// 2. Different features could have different weights on prediction scores.
+// 3. Make prediction (on each feature) only when the histogram has collected
+// sufficient counts.
public class HistogramPredictor {
final static String TAG = "HistogramPredictor";
diff --git a/bordeaux/service/src/android/bordeaux/services/ClusterManager.java b/bordeaux/service/src/android/bordeaux/services/ClusterManager.java
index 625f5ad..14721ba 100644
--- a/bordeaux/service/src/android/bordeaux/services/ClusterManager.java
+++ b/bordeaux/service/src/android/bordeaux/services/ClusterManager.java
@@ -180,7 +180,6 @@
saveSemanticClusters();
}
-
private void loadSemanticClusters() {
List<Map<String, String> > allData = mStorage.getAllData();
@@ -291,8 +290,9 @@
}
public String getSemanticLocation() {
- String label = UNKNOWN_LOCATION;
+ String label = LocationStatsAggregator.UNKNOWN_LOCATION;
+ // instead of using the last location, try acquiring the latest location.
if (mLastLocation != null) {
// TODO: use fast neatest neighbor search speed up location search
for (SemanticCluster cluster: mSemanticClusters) {
diff --git a/bordeaux/service/src/android/bordeaux/services/LocationStatsAggregator.java b/bordeaux/service/src/android/bordeaux/services/LocationStatsAggregator.java
index 165fb28..967bb6d 100644
--- a/bordeaux/service/src/android/bordeaux/services/LocationStatsAggregator.java
+++ b/bordeaux/service/src/android/bordeaux/services/LocationStatsAggregator.java
@@ -37,6 +37,7 @@
final String TAG = "LocationStatsAggregator";
public static final String CURRENT_LOCATION = "Current Location";
public static final String CURRENT_SPEED = "Current Speed";
+ public static final String UNKNOWN_LOCATION = "Unknown Location";
// TODO: Collect location on every minute
private static final long MINIMUM_TIME = 60000; // milliseconds
@@ -79,8 +80,10 @@
mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
*/
- // TODO: instead of outputing "unknow" should just not output anything.
- feature.put(CURRENT_LOCATION, mClusterManager.getSemanticLocation());
+ String location = mClusterManager.getSemanticLocation();
+ if (!location.equals(UNKNOWN_LOCATION)) {
+ feature.put(CURRENT_LOCATION, location);
+ }
}
return (Map) feature;
}
diff --git a/bordeaux/service/src/android/bordeaux/services/Predictor.java b/bordeaux/service/src/android/bordeaux/services/Predictor.java
index 6369340..e2bad2e 100644
--- a/bordeaux/service/src/android/bordeaux/services/Predictor.java
+++ b/bordeaux/service/src/android/bordeaux/services/Predictor.java
@@ -42,8 +42,15 @@
private HistogramPredictor mPredictor = new HistogramPredictor();
private FeatureAssembly mFeatureAssembly = new FeatureAssembly();
- public static final String SET_FEATURE = "set feature";
+ public static final String SET_FEATURE = "Set Feature";
+ public static final String USE_HISTORY = "Use History";
+ public static final String PREVIOUS_SAMPLE = "Previous Sample";
+
+ private boolean mUseHistory = false;
+ private long mHistorySpan = 0;
+ private String mPrevSample;
+ private long mPrevSampleTime;
/**
* Reset the Predictor
@@ -62,15 +69,30 @@
* pushed to the histogram
*/
public void pushNewSample(String sampleName) {
- Map<String, String> sampleFeatures = mFeatureAssembly.getFeatureMap();
+ Map<String, String> sampleFeatures = getSampleFeatures();
Log.e(TAG, "pushNewSample " + sampleName + ": " + sampleFeatures);
+ // TODO: move to the end of the function?
+ mPrevSample = sampleName;
+ mPrevSampleTime = System.currentTimeMillis();
+
mPredictor.addSample(sampleName, sampleFeatures);
if (modelChangeCallback != null) {
modelChangeCallback.modelChanged(this);
}
}
+ private Map<String, String> getSampleFeatures() {
+ Map<String, String> sampleFeatures = mFeatureAssembly.getFeatureMap();
+ long currTime = System.currentTimeMillis();
+
+ if (mUseHistory && mPrevSample != null &&
+ ((currTime - mPrevSampleTime) < mHistorySpan)) {
+ sampleFeatures.put(PREVIOUS_SAMPLE, mPrevSample);
+ }
+
+ return sampleFeatures;
+ }
// TODO: getTopK samples instead get scord for debugging only
/**
@@ -78,7 +100,7 @@
*/
public List<StringFloat> getTopCandidates(int topK) {
ArrayList<StringFloat> result = new ArrayList<StringFloat>(topK);
- Map<String, String> features = mFeatureAssembly.getFeatureMap();
+ Map<String, String> features = getSampleFeatures();
List<Map.Entry<String, Double> > topApps = mPredictor.findTopClasses(features, topK);
@@ -94,7 +116,6 @@
return result;
}
-
/**
* Set parameters for 1) using History in probability estimations e.g. consider the last event
* and 2) featureAssembly e.g. time and location.
@@ -108,6 +129,10 @@
} else {
Log.e(TAG,"Setting on feauture: " + value + " which is not available");
}
+ } else if (key.equals(USE_HISTORY)) {
+ mUseHistory = true;
+ mHistorySpan = Long.valueOf(value);
+ mPredictor.useFeature(PREVIOUS_SAMPLE);
} else {
Log.e(TAG,"Setting parameter " + key + " with " + value + " is not valid");
}
