| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.bordeaux.services; |
| |
| import android.bordeaux.services.ILearning_StochasticLinearRanker; |
| import android.bordeaux.services.StringFloat; |
| import android.content.Context; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** Ranker for the Learning framework. |
| * For training: call updateClassifier with a pair of samples. |
| * For ranking: call scoreSample to the score of the rank |
| * Data is represented as sparse key, value pair. And key is a String, value |
| * is a float. |
| * Note: since the actual ranker is running in a remote the service. |
| * Sometimes the connection may be lost or not established. |
| * |
| */ |
| public class BordeauxRanker { |
| static final String TAG = "BordeauxRanker"; |
| static final String RANKER_NOTAVAILABLE = "Ranker not Available"; |
| private Context mContext; |
| private String mName; |
| private ILearning_StochasticLinearRanker mRanker; |
| private ArrayList<StringFloat> getArrayList(final HashMap<String, Float> sample) { |
| ArrayList<StringFloat> stringfloat_sample = new ArrayList<StringFloat>(); |
| for (Map.Entry<String, Float> x : sample.entrySet()) { |
| StringFloat v = new StringFloat(); |
| v.key = x.getKey(); |
| v.value = x.getValue(); |
| stringfloat_sample.add(v); |
| } |
| return stringfloat_sample; |
| } |
| |
| public boolean retrieveRanker() { |
| if (mRanker == null) |
| mRanker = BordeauxManagerService.getRanker(mContext, mName); |
| // if classifier is not available, return false |
| if (mRanker == null) { |
| Log.e(TAG,"Ranker not available."); |
| return false; |
| } |
| return true; |
| } |
| |
| public BordeauxRanker(Context context) { |
| mContext = context; |
| mName = "defaultRanker"; |
| mRanker = BordeauxManagerService.getRanker(context, mName); |
| } |
| |
| public BordeauxRanker(Context context, String name) { |
| mContext = context; |
| mName = name; |
| mRanker = BordeauxManagerService.getRanker(context, mName); |
| } |
| |
| // Update the ranker with two samples, sample1 has higher rank than |
| // sample2. |
| public boolean update(final HashMap<String, Float> sample1, |
| final HashMap<String, Float> sample2) { |
| if (!retrieveRanker()) |
| return false; |
| try { |
| mRanker.UpdateClassifier(getArrayList(sample1), getArrayList(sample2)); |
| } catch (RemoteException e) { |
| Log.e(TAG,"Exception: updateClassifier."); |
| return false; |
| } |
| return true; |
| } |
| |
| public boolean reset() { |
| if (!retrieveRanker()){ |
| Log.e(TAG,"Exception: Ranker is not availible"); |
| return false; |
| } |
| try { |
| mRanker.ResetRanker(); |
| return true; |
| } catch (RemoteException e) { |
| } |
| return false; |
| } |
| |
| public float scoreSample(final HashMap<String, Float> sample) { |
| if (!retrieveRanker()) |
| throw new RuntimeException(RANKER_NOTAVAILABLE); |
| try { |
| return mRanker.ScoreSample(getArrayList(sample)); |
| } catch (RemoteException e) { |
| Log.e(TAG,"Exception: scoring the sample."); |
| throw new RuntimeException(RANKER_NOTAVAILABLE); |
| } |
| } |
| |
| public boolean setPriorWeight(final HashMap<String, Float> sample) { |
| if (!retrieveRanker()) |
| throw new RuntimeException(RANKER_NOTAVAILABLE); |
| try { |
| return mRanker.SetModelPriorWeight(getArrayList(sample)); |
| } catch (RemoteException e) { |
| Log.e(TAG,"Exception: set prior Weights"); |
| throw new RuntimeException(RANKER_NOTAVAILABLE); |
| } |
| } |
| |
| public boolean setParameter(String key, String value) { |
| if (!retrieveRanker()) |
| throw new RuntimeException(RANKER_NOTAVAILABLE); |
| try { |
| return mRanker.SetModelParameter(key, value); |
| } catch (RemoteException e) { |
| Log.e(TAG,"Exception: Setting Parameter"); |
| throw new RuntimeException(RANKER_NOTAVAILABLE); |
| } |
| } |
| } |