[ML8] Add a language weight

...and rename an improperly named normalization value

Bug: 11230254
Change-Id: I0f5633148a9f66dbfd7d28540b8a8985131c4549

22 files changed, 109 insertions, 72 deletions

diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index 2ae54348a..35c4681d9 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -188,7 +188,8 @@ public final class BinaryDictionary extends Dictionary {
             int[][] prevWordCodePointArrays, boolean[] isBeginningOfSentenceArray,
             int prevWordCount, int[] outputSuggestionCount, int[] outputCodePoints,
             int[] outputScores, int[] outputIndices, int[] outputTypes,
-            int[] outputAutoCommitFirstWordConfidence, float[] inOutLanguageWeight);
+            int[] outputAutoCommitFirstWordConfidence,
+            float[] inOutWeightOfLangModelVsSpatialModel);
     private static native boolean addUnigramEntryNative(long dict, int[] word, int probability,
             int[] shortcutTarget, int shortcutProbability, boolean isBeginningOfSentence,
             boolean isNotAWord, boolean isBlacklisted, int timestamp);
@@ -256,7 +257,8 @@ public final class BinaryDictionary extends Dictionary {
     public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
             final PrevWordsInfo prevWordsInfo, final ProximityInfo proximityInfo,
             final SettingsValuesForSuggestion settingsValuesForSuggestion,
-            final int sessionId, final float[] inOutLanguageWeight) {
+            final int sessionId, final float weightForLocale,
+            final float[] inOutWeightOfLangModelVsSpatialModel) {
         if (!isValidDictionary()) {
             return null;
         }
@@ -284,10 +286,12 @@ public final class BinaryDictionary extends Dictionary {
                 settingsValuesForSuggestion.mSpaceAwareGestureEnabled);
         session.mNativeSuggestOptions.setAdditionalFeaturesOptions(
                 settingsValuesForSuggestion.mAdditionalFeaturesSettingValues);
-        if (inOutLanguageWeight != null) {
-            session.mInputOutputLanguageWeight[0] = inOutLanguageWeight[0];
+        if (inOutWeightOfLangModelVsSpatialModel != null) {
+            session.mInputOutputWeightOfLangModelVsSpatialModel[0] =
+                    inOutWeightOfLangModelVsSpatialModel[0];
         } else {
-            session.mInputOutputLanguageWeight[0] = Dictionary.NOT_A_LANGUAGE_WEIGHT;
+            session.mInputOutputWeightOfLangModelVsSpatialModel[0] =
+                    Dictionary.NOT_A_WEIGHT_OF_LANG_MODEL_VS_SPATIAL_MODEL;
         }
         // TOOD: Pass multiple previous words information for n-gram.
         getSuggestionsNative(mNativeDict, proximityInfo.getNativeProximityInfo(),
@@ -298,9 +302,11 @@ public final class BinaryDictionary extends Dictionary {
                 session.mIsBeginningOfSentenceArray, prevWordsInfo.getPrevWordCount(),
                 session.mOutputSuggestionCount, session.mOutputCodePoints, session.mOutputScores,
                 session.mSpaceIndices, session.mOutputTypes,
-                session.mOutputAutoCommitFirstWordConfidence, session.mInputOutputLanguageWeight);
-        if (inOutLanguageWeight != null) {
-            inOutLanguageWeight[0] = session.mInputOutputLanguageWeight[0];
+                session.mOutputAutoCommitFirstWordConfidence,
+                session.mInputOutputWeightOfLangModelVsSpatialModel);
+        if (inOutWeightOfLangModelVsSpatialModel != null) {
+            inOutWeightOfLangModelVsSpatialModel[0] =
+                    session.mInputOutputWeightOfLangModelVsSpatialModel[0];
         }
         final int count = session.mOutputSuggestionCount[0];
         final ArrayList<SuggestedWordInfo> suggestions = new ArrayList<>();
@@ -314,7 +320,8 @@ public final class BinaryDictionary extends Dictionary {
             if (len > 0) {
                 suggestions.add(new SuggestedWordInfo(
                         new String(session.mOutputCodePoints, start, len),
-                        session.mOutputScores[j], session.mOutputTypes[j], this /* sourceDict */,
+                        (int)(session.mOutputScores[j] * weightForLocale), session.mOutputTypes[j],
+                        this /* sourceDict */,
                         session.mSpaceIndices[j] /* indexOfTouchPointOfSecondWord */,
                         session.mOutputAutoCommitFirstWordConfidence[0]));
             }
diff --git a/java/src/com/android/inputmethod/latin/DicTraverseSession.java b/java/src/com/android/inputmethod/latin/DicTraverseSession.java
index b341f623e..2751c1250 100644
--- a/java/src/com/android/inputmethod/latin/DicTraverseSession.java
+++ b/java/src/com/android/inputmethod/latin/DicTraverseSession.java
@@ -40,7 +40,7 @@ public final class DicTraverseSession {
     public final int[] mOutputTypes = new int[MAX_RESULTS];
     // Only one result is ever used
     public final int[] mOutputAutoCommitFirstWordConfidence = new int[1];
-    public final float[] mInputOutputLanguageWeight = new float[1];
+    public final float[] mInputOutputWeightOfLangModelVsSpatialModel = new float[1];
 
     public final NativeSuggestOptions mNativeSuggestOptions = new NativeSuggestOptions();
 
diff --git a/java/src/com/android/inputmethod/latin/Dictionary.java b/java/src/com/android/inputmethod/latin/Dictionary.java
index cad9ee7d8..b58a52b41 100644
--- a/java/src/com/android/inputmethod/latin/Dictionary.java
+++ b/java/src/com/android/inputmethod/latin/Dictionary.java
@@ -31,7 +31,7 @@ import java.util.HashSet;
  */
 public abstract class Dictionary {
     public static final int NOT_A_PROBABILITY = -1;
-    public static final float NOT_A_LANGUAGE_WEIGHT = -1.0f;
+    public static final float NOT_A_WEIGHT_OF_LANG_MODEL_VS_SPATIAL_MODEL = -1.0f;
 
     // The following types do not actually come from real dictionary instances, so we create
     // corresponding instances.
@@ -88,15 +88,18 @@ public abstract class Dictionary {
      * @param proximityInfo the object for key proximity. May be ignored by some implementations.
      * @param settingsValuesForSuggestion the settings values used for the suggestion.
      * @param sessionId the session id.
-     * @param inOutLanguageWeight the language weight used for generating suggestions.
-     * inOutLanguageWeight is a float array that has only one element. This can be updated when the
-     * different language weight is used.
+     * @param weightForLocale the weight given to this locale, to multiply the output scores for
+     * multilingual input.
+     * @param inOutWeightOfLangModelVsSpatialModel the weight of the language model as a ratio of
+     * the spatial model, used for generating suggestions. inOutWeightOfLangModelVsSpatialModel is
+     * a float array that has only one element. This can be updated when a different value is used.
      * @return the list of suggestions (possibly null if none)
      */
     abstract public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
             final PrevWordsInfo prevWordsInfo, final ProximityInfo proximityInfo,
             final SettingsValuesForSuggestion settingsValuesForSuggestion,
-            final int sessionId, final float[] inOutLanguageWeight);
+            final int sessionId, final float weightForLocale,
+            final float[] inOutWeightOfLangModelVsSpatialModel);
 
     /**
      * Checks if the given word has to be treated as a valid word. Please note that some
@@ -190,7 +193,8 @@ public abstract class Dictionary {
         public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
                 final PrevWordsInfo prevWordsInfo, final ProximityInfo proximityInfo,
                 final SettingsValuesForSuggestion settingsValuesForSuggestion,
-                final int sessionId, final float[] inOutLanguageWeight) {
+                final int sessionId, final float weightForLocale,
+                final float[] inOutWeightOfLangModelVsSpatialModel) {
             return null;
         }
 
diff --git a/java/src/com/android/inputmethod/latin/DictionaryCollection.java b/java/src/com/android/inputmethod/latin/DictionaryCollection.java
index ca5e93714..b26b37817 100644
--- a/java/src/com/android/inputmethod/latin/DictionaryCollection.java
+++ b/java/src/com/android/inputmethod/latin/DictionaryCollection.java
@@ -62,20 +62,21 @@ public final class DictionaryCollection extends Dictionary {
     public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
             final PrevWordsInfo prevWordsInfo, final ProximityInfo proximityInfo,
             final SettingsValuesForSuggestion settingsValuesForSuggestion,
-            final int sessionId, final float[] inOutLanguageWeight) {
+            final int sessionId, final float weightForLocale,
+            final float[] inOutWeightOfLangModelVsSpatialModel) {
         final CopyOnWriteArrayList<Dictionary> dictionaries = mDictionaries;
         if (dictionaries.isEmpty()) return null;
         // To avoid creating unnecessary objects, we get the list out of the first
         // dictionary and add the rest to it if not null, hence the get(0)
         ArrayList<SuggestedWordInfo> suggestions = dictionaries.get(0).getSuggestions(composer,
                 prevWordsInfo, proximityInfo, settingsValuesForSuggestion, sessionId,
-                inOutLanguageWeight);
+                weightForLocale, inOutWeightOfLangModelVsSpatialModel);
         if (null == suggestions) suggestions = new ArrayList<>();
         final int length = dictionaries.size();
         for (int i = 1; i < length; ++ i) {
             final ArrayList<SuggestedWordInfo> sugg = dictionaries.get(i).getSuggestions(composer,
                     prevWordsInfo, proximityInfo, settingsValuesForSuggestion, sessionId,
-                    inOutLanguageWeight);
+                    weightForLocale, inOutWeightOfLangModelVsSpatialModel);
             if (null != sugg) suggestions.addAll(sugg);
         }
         return suggestions;
diff --git a/java/src/com/android/inputmethod/latin/DictionaryFacilitator.java b/java/src/com/android/inputmethod/latin/DictionaryFacilitator.java
index 0f09daf86..9af15c182 100644
--- a/java/src/com/android/inputmethod/latin/DictionaryFacilitator.java
+++ b/java/src/com/android/inputmethod/latin/DictionaryFacilitator.java
@@ -104,6 +104,7 @@ public class DictionaryFacilitator {
     private static class DictionaryGroup {
         public final Locale mLocale;
         private Dictionary mMainDict;
+        public float mWeightForLocale = 1.0f;
         public final ConcurrentHashMap<String, ExpandableBinaryDictionary> mSubDictMap =
                 new ConcurrentHashMap<>();
 
@@ -598,14 +599,16 @@ public class DictionaryFacilitator {
         final SuggestionResults suggestionResults = new SuggestionResults(
                 SuggestedWords.MAX_SUGGESTIONS,
                 prevWordsInfo.mPrevWordsInfo[0].mIsBeginningOfSentence);
-        final float[] languageWeight = new float[] { Dictionary.NOT_A_LANGUAGE_WEIGHT };
+        final float[] weightOfLangModelVsSpatialModel =
+                new float[] { Dictionary.NOT_A_WEIGHT_OF_LANG_MODEL_VS_SPATIAL_MODEL };
         for (final DictionaryGroup dictionaryGroup : dictionaryGroups) {
             for (final String dictType : DICT_TYPES_ORDERED_TO_GET_SUGGESTIONS) {
                 final Dictionary dictionary = dictionaryGroup.getDict(dictType);
                 if (null == dictionary) continue;
                 final ArrayList<SuggestedWordInfo> dictionarySuggestions =
                         dictionary.getSuggestions(composer, prevWordsInfo, proximityInfo,
-                                settingsValuesForSuggestion, sessionId, languageWeight);
+                                settingsValuesForSuggestion, sessionId,
+                                dictionaryGroup.mWeightForLocale, weightOfLangModelVsSpatialModel);
                 if (null == dictionarySuggestions) continue;
                 suggestionResults.addAll(dictionarySuggestions);
                 if (null != suggestionResults.mRawSuggestions) {
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index 671ba6714..ad967c133 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -435,7 +435,7 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
     public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
             final PrevWordsInfo prevWordsInfo, final ProximityInfo proximityInfo,
             final SettingsValuesForSuggestion settingsValuesForSuggestion, final int sessionId,
-            final float[] inOutLanguageWeight) {
+            final float weightForLocale, final float[] inOutWeightOfLangModelVsSpatialModel) {
         reloadDictionaryIfRequired();
         boolean lockAcquired = false;
         try {
@@ -447,7 +447,8 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
                 }
                 final ArrayList<SuggestedWordInfo> suggestions =
                         mBinaryDictionary.getSuggestions(composer, prevWordsInfo, proximityInfo,
-                                settingsValuesForSuggestion, sessionId, inOutLanguageWeight);
+                                settingsValuesForSuggestion, sessionId, weightForLocale,
+                                inOutWeightOfLangModelVsSpatialModel);
                 if (mBinaryDictionary.isCorrupted()) {
                     Log.i(TAG, "Dictionary (" + mDictName +") is corrupted. "
                             + "Remove and regenerate it.");
diff --git a/java/src/com/android/inputmethod/latin/ReadOnlyBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ReadOnlyBinaryDictionary.java
index ecf25c28b..827367bb4 100644
--- a/java/src/com/android/inputmethod/latin/ReadOnlyBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ReadOnlyBinaryDictionary.java
@@ -53,11 +53,13 @@ public final class ReadOnlyBinaryDictionary extends Dictionary {
     public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
             final PrevWordsInfo prevWordsInfo, final ProximityInfo proximityInfo,
             final SettingsValuesForSuggestion settingsValuesForSuggestion,
-            final int sessionId, final float[] inOutLanguageWeight) {
+            final int sessionId, final float weightForLocale,
+            final float[] inOutWeightOfLangModelVsSpatialModel) {
         if (mLock.readLock().tryLock()) {
             try {
                 return mBinaryDictionary.getSuggestions(composer, prevWordsInfo, proximityInfo,
-                        settingsValuesForSuggestion, sessionId, inOutLanguageWeight);
+                        settingsValuesForSuggestion, sessionId, weightForLocale,
+                        inOutWeightOfLangModelVsSpatialModel);
             } finally {
                 mLock.readLock().unlock();
             }
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index e65dc4c06..688ce44be 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -182,7 +182,8 @@ static void latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jclass clazz,
         jobjectArray prevWordCodePointArrays, jbooleanArray isBeginningOfSentenceArray,
         jint prevWordCount, jintArray outSuggestionCount, jintArray outCodePointsArray,
         jintArray outScoresArray, jintArray outSpaceIndicesArray, jintArray outTypesArray,
-        jintArray outAutoCommitFirstWordConfidenceArray, jfloatArray inOutLanguageWeight) {
+        jintArray outAutoCommitFirstWordConfidenceArray,
+        jfloatArray inOutWeightOfLangModelVsSpatialModel) {
     Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
     // Assign 0 to outSuggestionCount here in case of returning earlier in this method.
     JniDataUtils::putIntToArray(env, outSuggestionCount, 0 /* index */, 0);
@@ -237,8 +238,9 @@ static void latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jclass clazz,
         ASSERT(false);
         return;
     }
-    float languageWeight;
-    env->GetFloatArrayRegion(inOutLanguageWeight, 0, 1 /* len */, &languageWeight);
+    float weightOfLangModelVsSpatialModel;
+    env->GetFloatArrayRegion(inOutWeightOfLangModelVsSpatialModel, 0, 1 /* len */,
+            &weightOfLangModelVsSpatialModel);
     SuggestionResults suggestionResults(MAX_RESULTS);
     const PrevWordsInfo prevWordsInfo = JniDataUtils::constructPrevWordsInfo(env,
             prevWordCodePointArrays, isBeginningOfSentenceArray, prevWordCount);
@@ -246,13 +248,13 @@ static void latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jclass clazz,
         // TODO: Use SuggestionResults to return suggestions.
         dictionary->getSuggestions(pInfo, traverseSession, xCoordinates, yCoordinates,
                 times, pointerIds, inputCodePoints, inputSize, &prevWordsInfo,
-                &givenSuggestOptions, languageWeight, &suggestionResults);
+                &givenSuggestOptions, weightOfLangModelVsSpatialModel, &suggestionResults);
     } else {
         dictionary->getPredictions(&prevWordsInfo, &suggestionResults);
     }
     suggestionResults.outputSuggestions(env, outSuggestionCount, outCodePointsArray,
             outScoresArray, outSpaceIndicesArray, outTypesArray,
-            outAutoCommitFirstWordConfidenceArray, inOutLanguageWeight);
+            outAutoCommitFirstWordConfidenceArray, inOutWeightOfLangModelVsSpatialModel);
 }
 
 static jint latinime_BinaryDictionary_getProbability(JNIEnv *env, jclass clazz, jlong dict,
diff --git a/native/jni/src/defines.h b/native/jni/src/defines.h
index 56d8bbb72..e55c9eb8a 100644
--- a/native/jni/src/defines.h
+++ b/native/jni/src/defines.h
@@ -301,7 +301,7 @@ static inline void prof_out(void) {
 #define NOT_A_DICT_POS (S_INT_MIN)
 #define NOT_A_WORD_ID (S_INT_MIN)
 #define NOT_A_TIMESTAMP (-1)
-#define NOT_A_LANGUAGE_WEIGHT (-1.0f)
+#define NOT_A_WEIGHT_OF_LANG_MODEL_VS_SPATIAL_MODEL (-1.0f)
 
 // A special value to mean the first word confidence makes no sense in this case,
 // e.g. this is not a multi-word suggestion.
diff --git a/native/jni/src/suggest/core/dicnode/dic_node.h b/native/jni/src/suggest/core/dicnode/dic_node.h
index ec61783cb..5214077dc 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node.h
@@ -295,8 +295,9 @@ class DicNode {
     }
 
     // Used to prune nodes
-    float getCompoundDistance(const float languageWeight) const {
-        return mDicNodeState.mDicNodeStateScoring.getCompoundDistance(languageWeight);
+    float getCompoundDistance(const float weightOfLangModelVsSpatialModel) const {
+        return mDicNodeState.mDicNodeStateScoring.getCompoundDistance(
+                weightOfLangModelVsSpatialModel);
     }
 
     AK_FORCE_INLINE const int *getOutputWordBuf() const {
diff --git a/native/jni/src/suggest/core/dicnode/internal/dic_node_state_scoring.h b/native/jni/src/suggest/core/dicnode/internal/dic_node_state_scoring.h
index c19d48eb9..3a54c2599 100644
--- a/native/jni/src/suggest/core/dicnode/internal/dic_node_state_scoring.h
+++ b/native/jni/src/suggest/core/dicnode/internal/dic_node_state_scoring.h
@@ -103,8 +103,10 @@ class DicNodeStateScoring {
         return getCompoundDistance(1.0f);
     }
 
-    float getCompoundDistance(const float languageWeight) const {
-        return mSpatialDistance + mLanguageDistance * languageWeight;
+    float getCompoundDistance(
+            const float weightOfLangModelVsSpatialModel) const {
+        return mSpatialDistance
+                + mLanguageDistance * weightOfLangModelVsSpatialModel;
     }
 
     float getNormalizedCompoundDistance() const {
diff --git a/native/jni/src/suggest/core/dictionary/dictionary.cpp b/native/jni/src/suggest/core/dictionary/dictionary.cpp
index f9f36ce44..e4084b0f5 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.cpp
+++ b/native/jni/src/suggest/core/dictionary/dictionary.cpp
@@ -47,14 +47,14 @@ Dictionary::Dictionary(JNIEnv *env, DictionaryStructureWithBufferPolicy::Structu
 void Dictionary::getSuggestions(ProximityInfo *proximityInfo, DicTraverseSession *traverseSession,
         int *xcoordinates, int *ycoordinates, int *times, int *pointerIds, int *inputCodePoints,
         int inputSize, const PrevWordsInfo *const prevWordsInfo,
-        const SuggestOptions *const suggestOptions, const float languageWeight,
+        const SuggestOptions *const suggestOptions, const float weightOfLangModelVsSpatialModel,
         SuggestionResults *const outSuggestionResults) const {
     TimeKeeper::setCurrentTime();
     traverseSession->init(this, prevWordsInfo, suggestOptions);
     const auto &suggest = suggestOptions->isGesture() ? mGestureSuggest : mTypingSuggest;
     suggest->getSuggestions(proximityInfo, traverseSession, xcoordinates,
             ycoordinates, times, pointerIds, inputCodePoints, inputSize,
-            languageWeight, outSuggestionResults);
+            weightOfLangModelVsSpatialModel, outSuggestionResults);
     if (DEBUG_DICT) {
         outSuggestionResults->dumpSuggestions();
     }
diff --git a/native/jni/src/suggest/core/dictionary/dictionary.h b/native/jni/src/suggest/core/dictionary/dictionary.h
index f6482ab78..324e3504a 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.h
+++ b/native/jni/src/suggest/core/dictionary/dictionary.h
@@ -66,7 +66,7 @@ class Dictionary {
     void getSuggestions(ProximityInfo *proximityInfo, DicTraverseSession *traverseSession,
             int *xcoordinates, int *ycoordinates, int *times, int *pointerIds, int *inputCodePoints,
             int inputSize, const PrevWordsInfo *const prevWordsInfo,
-            const SuggestOptions *const suggestOptions, const float languageWeight,
+            const SuggestOptions *const suggestOptions, const float weightOfLangModelVsSpatialModel,
             SuggestionResults *const outSuggestionResults) const;
 
     void getPredictions(const PrevWordsInfo *const prevWordsInfo,
diff --git a/native/jni/src/suggest/core/policy/scoring.h b/native/jni/src/suggest/core/policy/scoring.h
index 9e75cace4..ce3684a1c 100644
--- a/native/jni/src/suggest/core/policy/scoring.h
+++ b/native/jni/src/suggest/core/policy/scoring.h
@@ -32,9 +32,11 @@ class Scoring {
             const ErrorTypeUtils::ErrorType containedErrorTypes, const bool forceCommit,
             const bool boostExactMatches) const = 0;
     virtual void getMostProbableString(const DicTraverseSession *const traverseSession,
-            const float languageWeight, SuggestionResults *const outSuggestionResults) const = 0;
-    virtual float getAdjustedLanguageWeight(DicTraverseSession *const traverseSession,
-            DicNode *const terminals, const int size) const = 0;
+            const float weightOfLangModelVsSpatialModel,
+            SuggestionResults *const outSuggestionResults) const = 0;
+    virtual float getAdjustedWeightOfLangModelVsSpatialModel(
+            DicTraverseSession *const traverseSession, DicNode *const terminals,
+            const int size) const = 0;
     virtual float getDoubleLetterDemotionDistanceCost(
             const DicNode *const terminalDicNode) const = 0;
     virtual bool autoCorrectsToMultiWordSuggestionIfTop() const = 0;
diff --git a/native/jni/src/suggest/core/result/suggestion_results.cpp b/native/jni/src/suggest/core/result/suggestion_results.cpp
index 4c10bd08a..3756d1092 100644
--- a/native/jni/src/suggest/core/result/suggestion_results.cpp
+++ b/native/jni/src/suggest/core/result/suggestion_results.cpp
@@ -23,7 +23,7 @@ namespace latinime {
 void SuggestionResults::outputSuggestions(JNIEnv *env, jintArray outSuggestionCount,
         jintArray outputCodePointsArray, jintArray outScoresArray, jintArray outSpaceIndicesArray,
         jintArray outTypesArray, jintArray outAutoCommitFirstWordConfidenceArray,
-        jfloatArray outLanguageWeight) {
+        jfloatArray outWeightOfLangModelVsSpatialModel) {
     int outputIndex = 0;
     while (!mSuggestedWords.empty()) {
         const SuggestedWord &suggestedWord = mSuggestedWords.top();
@@ -44,7 +44,8 @@ void SuggestionResults::outputSuggestions(JNIEnv *env, jintArray outSuggestionCo
         mSuggestedWords.pop();
     }
     JniDataUtils::putIntToArray(env, outSuggestionCount, 0 /* index */, outputIndex);
-    JniDataUtils::putFloatToArray(env, outLanguageWeight, 0 /* index */, mLanguageWeight);
+    JniDataUtils::putFloatToArray(env, outWeightOfLangModelVsSpatialModel, 0 /* index */,
+            mWeightOfLangModelVsSpatialModel);
 }
 
 void SuggestionResults::addPrediction(const int *const codePoints, const int codePointCount,
@@ -89,7 +90,7 @@ void SuggestionResults::getSortedScores(int *const outScores) const {
 }
 
 void SuggestionResults::dumpSuggestions() const {
-    AKLOGE("language weight: %f", mLanguageWeight);
+    AKLOGE("weight of language model vs spatial model: %f", mWeightOfLangModelVsSpatialModel);
     std::vector<SuggestedWord> suggestedWords;
     auto copyOfSuggestedWords = mSuggestedWords;
     while (!copyOfSuggestedWords.empty()) {
diff --git a/native/jni/src/suggest/core/result/suggestion_results.h b/native/jni/src/suggest/core/result/suggestion_results.h
index 8e845e2d3..738c78a9f 100644
--- a/native/jni/src/suggest/core/result/suggestion_results.h
+++ b/native/jni/src/suggest/core/result/suggestion_results.h
@@ -29,13 +29,15 @@ namespace latinime {
 class SuggestionResults {
  public:
     explicit SuggestionResults(const int maxSuggestionCount)
-            : mMaxSuggestionCount(maxSuggestionCount), mLanguageWeight(NOT_A_LANGUAGE_WEIGHT),
+            : mMaxSuggestionCount(maxSuggestionCount),
+              mWeightOfLangModelVsSpatialModel(NOT_A_WEIGHT_OF_LANG_MODEL_VS_SPATIAL_MODEL),
               mSuggestedWords() {}
 
     // Returns suggestion count.
     void outputSuggestions(JNIEnv *env, jintArray outSuggestionCount, jintArray outCodePointsArray,
             jintArray outScoresArray, jintArray outSpaceIndicesArray, jintArray outTypesArray,
-            jintArray outAutoCommitFirstWordConfidenceArray, jfloatArray outLanguageWeight);
+            jintArray outAutoCommitFirstWordConfidenceArray,
+            jfloatArray outWeightOfLangModelVsSpatialModel);
     void addPrediction(const int *const codePoints, const int codePointCount, const int score);
     void addSuggestion(const int *const codePoints, const int codePointCount,
             const int score, const int type, const int indexToPartialCommit,
@@ -43,8 +45,8 @@ class SuggestionResults {
     void getSortedScores(int *const outScores) const;
     void dumpSuggestions() const;
 
-    void setLanguageWeight(const float languageWeight) {
-        mLanguageWeight = languageWeight;
+    void setWeightOfLangModelVsSpatialModel(const float weightOfLangModelVsSpatialModel) {
+        mWeightOfLangModelVsSpatialModel = weightOfLangModelVsSpatialModel;
     }
 
     int getSuggestionCount() const {
@@ -55,7 +57,7 @@ class SuggestionResults {
     DISALLOW_IMPLICIT_CONSTRUCTORS(SuggestionResults);
 
     const int mMaxSuggestionCount;
-    float mLanguageWeight;
+    float mWeightOfLangModelVsSpatialModel;
     std::priority_queue<
             SuggestedWord, std::vector<SuggestedWord>, SuggestedWord::Comparator> mSuggestedWords;
 };
diff --git a/native/jni/src/suggest/core/result/suggestions_output_utils.cpp b/native/jni/src/suggest/core/result/suggestions_output_utils.cpp
index 6e0193772..3283f6deb 100644
--- a/native/jni/src/suggest/core/result/suggestions_output_utils.cpp
+++ b/native/jni/src/suggest/core/result/suggestions_output_utils.cpp
@@ -34,7 +34,8 @@ const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
 
 /* static */ void SuggestionsOutputUtils::outputSuggestions(
         const Scoring *const scoringPolicy, DicTraverseSession *traverseSession,
-        const float languageWeight, SuggestionResults *const outSuggestionResults) {
+        const float weightOfLangModelVsSpatialModel,
+        SuggestionResults *const outSuggestionResults) {
 #if DEBUG_EVALUATE_MOST_PROBABLE_STRING
     const int terminalSize = 0;
 #else
@@ -44,12 +45,15 @@ const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
     for (int index = terminalSize - 1; index >= 0; --index) {
         traverseSession->getDicTraverseCache()->popTerminal(&terminals[index]);
     }
-    // Compute a language weight when an invalid language weight is passed.
-    // NOT_A_LANGUAGE_WEIGHT (-1) is assumed as an invalid language weight.
-    const float languageWeightToOutputSuggestions = (languageWeight < 0.0f) ?
-            scoringPolicy->getAdjustedLanguageWeight(
-                    traverseSession, terminals.data(), terminalSize) : languageWeight;
-    outSuggestionResults->setLanguageWeight(languageWeightToOutputSuggestions);
+    // Compute a weight of language model when an invalid weight is passed.
+    // NOT_A_WEIGHT_OF_LANG_MODEL_VS_SPATIAL_MODEL (-1) is taken as an invalid value.
+    const float weightOfLangModelVsSpatialModelToOutputSuggestions =
+            (weightOfLangModelVsSpatialModel < 0.0f)
+            ? scoringPolicy->getAdjustedWeightOfLangModelVsSpatialModel(traverseSession,
+                    terminals.data(), terminalSize)
+            : weightOfLangModelVsSpatialModel;
+    outSuggestionResults->setWeightOfLangModelVsSpatialModel(
+            weightOfLangModelVsSpatialModelToOutputSuggestions);
     // Force autocorrection for obvious long multi-word suggestions when the top suggestion is
     // a long multiple words suggestion.
     // TODO: Implement a smarter auto-commit method for handling multi-word suggestions.
@@ -65,16 +69,16 @@ const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
     // Output suggestion results here
     for (auto &terminalDicNode : terminals) {
         outputSuggestionsOfDicNode(scoringPolicy, traverseSession, &terminalDicNode,
-                languageWeightToOutputSuggestions, boostExactMatches, forceCommitMultiWords,
-                outputSecondWordFirstLetterInputIndex, outSuggestionResults);
+                weightOfLangModelVsSpatialModelToOutputSuggestions, boostExactMatches,
+                forceCommitMultiWords, outputSecondWordFirstLetterInputIndex, outSuggestionResults);
     }
-    scoringPolicy->getMostProbableString(traverseSession, languageWeightToOutputSuggestions,
-            outSuggestionResults);
+    scoringPolicy->getMostProbableString(traverseSession,
+            weightOfLangModelVsSpatialModelToOutputSuggestions, outSuggestionResults);
 }
 
 /* static */ void SuggestionsOutputUtils::outputSuggestionsOfDicNode(
         const Scoring *const scoringPolicy, DicTraverseSession *traverseSession,
-        const DicNode *const terminalDicNode, const float languageWeight,
+        const DicNode *const terminalDicNode, const float weightOfLangModelVsSpatialModel,
         const bool boostExactMatches, const bool forceCommitMultiWords,
         const bool outputSecondWordFirstLetterInputIndex,
         SuggestionResults *const outSuggestionResults) {
@@ -83,8 +87,9 @@ const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
     }
     const float doubleLetterCost =
             scoringPolicy->getDoubleLetterDemotionDistanceCost(terminalDicNode);
-    const float compoundDistance = terminalDicNode->getCompoundDistance(languageWeight)
-            + doubleLetterCost;
+    const float compoundDistance =
+            terminalDicNode->getCompoundDistance(weightOfLangModelVsSpatialModel)
+                    + doubleLetterCost;
     const WordAttributes wordAttributes = traverseSession->getDictionaryStructurePolicy()
             ->getWordAttributesInContext(terminalDicNode->getPrevWordIds(),
                     terminalDicNode->getWordId(), nullptr /* multiBigramMap */);
diff --git a/native/jni/src/suggest/core/result/suggestions_output_utils.h b/native/jni/src/suggest/core/result/suggestions_output_utils.h
index b099b4776..bf8497828 100644
--- a/native/jni/src/suggest/core/result/suggestions_output_utils.h
+++ b/native/jni/src/suggest/core/result/suggestions_output_utils.h
@@ -33,7 +33,7 @@ class SuggestionsOutputUtils {
      * Outputs the final list of suggestions (i.e., terminal nodes).
      */
     static void outputSuggestions(const Scoring *const scoringPolicy,
-            DicTraverseSession *traverseSession, const float languageWeight,
+            DicTraverseSession *traverseSession, const float weightOfLangModelVsSpatialModel,
             SuggestionResults *const outSuggestionResults);
 
  private:
@@ -44,7 +44,7 @@ class SuggestionsOutputUtils {
 
     static void outputSuggestionsOfDicNode(const Scoring *const scoringPolicy,
             DicTraverseSession *traverseSession, const DicNode *const terminalDicNode,
-            const float languageWeight, const bool boostExactMatches,
+            const float weightOfLangModelVsSpatialModel, const bool boostExactMatches,
             const bool forceCommitMultiWords, const bool outputSecondWordFirstLetterInputIndex,
             SuggestionResults *const outSuggestionResults);
     static void outputShortcuts(BinaryDictionaryShortcutIterator *const shortcutIt,
diff --git a/native/jni/src/suggest/core/suggest.cpp b/native/jni/src/suggest/core/suggest.cpp
index 947d41f4b..457414f2b 100644
--- a/native/jni/src/suggest/core/suggest.cpp
+++ b/native/jni/src/suggest/core/suggest.cpp
@@ -45,7 +45,7 @@ const int Suggest::MIN_CONTINUOUS_SUGGESTION_INPUT_SIZE = 2;
  */
 void Suggest::getSuggestions(ProximityInfo *pInfo, void *traverseSession,
         int *inputXs, int *inputYs, int *times, int *pointerIds, int *inputCodePoints,
-        int inputSize, const float languageWeight,
+        int inputSize, const float weightOfLangModelVsSpatialModel,
         SuggestionResults *const outSuggestionResults) const {
     PROF_OPEN;
     PROF_START(0);
@@ -68,7 +68,7 @@ void Suggest::getSuggestions(ProximityInfo *pInfo, void *traverseSession,
     PROF_END(1);
     PROF_START(2);
     SuggestionsOutputUtils::outputSuggestions(
-            SCORING, tSession, languageWeight, outSuggestionResults);
+            SCORING, tSession, weightOfLangModelVsSpatialModel, outSuggestionResults);
     PROF_END(2);
     PROF_CLOSE;
 }
diff --git a/native/jni/src/suggest/core/suggest.h b/native/jni/src/suggest/core/suggest.h
index 788e0314b..65d5918cf 100644
--- a/native/jni/src/suggest/core/suggest.h
+++ b/native/jni/src/suggest/core/suggest.h
@@ -49,7 +49,8 @@ class Suggest : public SuggestInterface {
     AK_FORCE_INLINE virtual ~Suggest() {}
     void getSuggestions(ProximityInfo *pInfo, void *traverseSession, int *inputXs, int *inputYs,
             int *times, int *pointerIds, int *inputCodePoints, int inputSize,
-            const float languageWeight, SuggestionResults *const outSuggestionResults) const;
+            const float weightOfLangModelVsSpatialModel,
+            SuggestionResults *const outSuggestionResults) const;
 
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(Suggest);
diff --git a/native/jni/src/suggest/core/suggest_interface.h b/native/jni/src/suggest/core/suggest_interface.h
index a6e5aefae..a05aa9c80 100644
--- a/native/jni/src/suggest/core/suggest_interface.h
+++ b/native/jni/src/suggest/core/suggest_interface.h
@@ -28,7 +28,8 @@ class SuggestInterface {
  public:
     virtual void getSuggestions(ProximityInfo *pInfo, void *traverseSession, int *inputXs,
             int *inputYs, int *times, int *pointerIds, int *inputCodePoints, int inputSize,
-            const float languageWeight, SuggestionResults *const suggestionResults) const = 0;
+            const float weightOfLangModelVsSpatialModel,
+            SuggestionResults *const suggestionResults) const = 0;
     SuggestInterface() {}
     virtual ~SuggestInterface() {}
  private:
diff --git a/native/jni/src/suggest/policyimpl/typing/typing_scoring.h b/native/jni/src/suggest/policyimpl/typing/typing_scoring.h
index 52c4251f0..0240bcf54 100644
--- a/native/jni/src/suggest/policyimpl/typing/typing_scoring.h
+++ b/native/jni/src/suggest/policyimpl/typing/typing_scoring.h
@@ -33,10 +33,12 @@ class TypingScoring : public Scoring {
     static const TypingScoring *getInstance() { return &sInstance; }
 
     AK_FORCE_INLINE void getMostProbableString(const DicTraverseSession *const traverseSession,
-            const float languageWeight, SuggestionResults *const outSuggestionResults) const {}
+            const float weightOfLangModelVsSpatialModel,
+            SuggestionResults *const outSuggestionResults) const {}
 
-    AK_FORCE_INLINE float getAdjustedLanguageWeight(DicTraverseSession *const traverseSession,
-            DicNode *const terminals, const int size) const {
+    AK_FORCE_INLINE float getAdjustedWeightOfLangModelVsSpatialModel(
+            DicTraverseSession *const traverseSession, DicNode *const terminals,
+            const int size) const {
         return 1.0f;
     }