Don't boost exact matches for personalized dicts.

Bug: 12800726
Change-Id: Ia3a2f82db6cdc9645cad0e329c0b79328d7452cc

native/jni/src/suggest/core/dictionary/suggestions_output_utils.cpp

@@ -78,7 +78,8 @@ const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
         outputAutoCommitFirstWordConfidence[0] =
                 computeFirstWordConfidence(&terminals[0]);
     }
-
+    const bool boostExactMatches = traverseSession->getDictionaryStructurePolicy()->
+            getHeaderStructurePolicy()->shouldBoostExactMatches();
     // Output suggestion results here
     for (int terminalIndex = 0; terminalIndex < terminalSize && outputWordIndex < MAX_RESULTS;
             ++terminalIndex) {
@@ -102,7 +103,7 @@ const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
                 && !(isPossiblyOffensiveWord && isFirstCharUppercase);
         const int outputTypeFlags =
                 (isPossiblyOffensiveWord ? Dictionary::KIND_FLAG_POSSIBLY_OFFENSIVE : 0)
-                | (isSafeExactMatch ? Dictionary::KIND_FLAG_EXACT_MATCH : 0);
+                | ((isSafeExactMatch && boostExactMatches) ? Dictionary::KIND_FLAG_EXACT_MATCH : 0);
 
         // Entries that are blacklisted or do not represent a word should not be output.
         const bool isValidWord = !terminalDicNode->isBlacklistedOrNotAWord();
@@ -113,7 +114,8 @@ const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
                 compoundDistance, traverseSession->getInputSize(),
                 terminalDicNode->getContainedErrorTypes(),
                 (forceCommitMultiWords && terminalDicNode->hasMultipleWords())
-                         || (isValidWord && scoringPolicy->doesAutoCorrectValidWord()));
+                         || (isValidWord && scoringPolicy->doesAutoCorrectValidWord()),
+                boostExactMatches);
         if (maxScore < finalScore && isValidWord) {
             maxScore = finalScore;
         }
@@ -147,7 +149,7 @@ const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
                      scoringPolicy->calculateFinalScore(compoundDistance,
                              traverseSession->getInputSize(),
                              terminalDicNode->getContainedErrorTypes(),
-                             true /* forceCommit */) : finalScore;
+                             true /* forceCommit */, boostExactMatches) : finalScore;
             const int updatedOutputWordIndex = outputShortcuts(&shortcutIt,
                     outputWordIndex, shortcutBaseScore, outputCodePoints, frequencies, outputTypes,
                     sameAsTyped);

native/jni/src/suggest/core/policy/dictionary_header_structure_policy.h

@@ -40,6 +40,8 @@ class DictionaryHeaderStructurePolicy {
     virtual void readHeaderValueOrQuestionMark(const char *const key, int *outValue,
             int outValueSize) const = 0;
 
+    virtual bool shouldBoostExactMatches() const = 0;
+
  protected:
     DictionaryHeaderStructurePolicy() {}
 

native/jni/src/suggest/core/policy/scoring.h

@@ -28,7 +28,8 @@ class DicTraverseSession;
 class Scoring {
  public:
     virtual int calculateFinalScore(const float compoundDistance, const int inputSize,
-            const ErrorTypeUtils::ErrorType containedErrorTypes, const bool forceCommit) const = 0;
+            const ErrorTypeUtils::ErrorType containedErrorTypes, const bool forceCommit,
+            const bool boostExactMatches) const = 0;
     virtual bool getMostProbableString(const DicTraverseSession *const traverseSession,
             const int terminalSize, const float languageWeight, int *const outputCodePoints,
             int *const type, int *const freq) const = 0;

native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h

@@ -146,6 +146,11 @@ class HeaderPolicy : public DictionaryHeaderStructurePolicy {
         return mHasHistoricalInfoOfWords;
     }
 
+    AK_FORCE_INLINE bool shouldBoostExactMatches() const {
+        // TODO: Investigate better ways to handle exact matches for personalized dictionaries.
+        return !isDecayingDict();
+    }
+
     void readHeaderValueOrQuestionMark(const char *const key,
             int *outValue, int outValueSize) const;
 

native/jni/src/suggest/policyimpl/typing/typing_scoring.h

@@ -50,14 +50,14 @@ class TypingScoring : public Scoring {
 
     AK_FORCE_INLINE int calculateFinalScore(const float compoundDistance,
             const int inputSize, const ErrorTypeUtils::ErrorType containedErrorTypes,
-            const bool forceCommit) const {
+            const bool forceCommit, const bool boostExactMatches) const {
         const float maxDistance = ScoringParams::DISTANCE_WEIGHT_LANGUAGE
                 + static_cast<float>(inputSize) * ScoringParams::TYPING_MAX_OUTPUT_SCORE_PER_INPUT;
         float score = ScoringParams::TYPING_BASE_OUTPUT_SCORE - compoundDistance / maxDistance;
         if (forceCommit) {
             score += ScoringParams::AUTOCORRECT_OUTPUT_THRESHOLD;
         }
-        if (ErrorTypeUtils::isExactMatch(containedErrorTypes)) {
+        if (boostExactMatches && ErrorTypeUtils::isExactMatch(containedErrorTypes)) {
             score += ScoringParams::EXACT_MATCH_PROMOTION;
             if ((ErrorTypeUtils::MATCH_WITH_CASE_ERROR & containedErrorTypes) != 0) {
                 score -= ScoringParams::CASE_ERROR_PENALTY_FOR_EXACT_MATCH;