Merge "Remove ProbabilityDictContent and use LanguageModelDictContent" into lmp-dev

16 files changed, 43 insertions, 282 deletions

diff --git a/native/jni/NativeFileList.mk b/native/jni/NativeFileList.mk
index 64704d94a..7a732a588 100644
--- a/native/jni/NativeFileList.mk
+++ b/native/jni/NativeFileList.mk
@@ -73,7 +73,6 @@ LATIN_IME_CORE_SRC_FILES := \
     $(addprefix suggest/policyimpl/dictionary/structure/v4/content/, \
         bigram_dict_content.cpp \
         language_model_dict_content.cpp \
-        probability_dict_content.cpp \
         shortcut_dict_content.cpp \
         sparse_table_dict_content.cpp \
         terminal_position_lookup_table.cpp) \
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.cpp
index ae5847568..07e1051bc 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.cpp
@@ -30,7 +30,7 @@ bool LanguageModelDictContent::runGC(
             0 /* nextLevelBitmapEntryIndex */, outNgramCount);
 }
 
-ProbabilityEntry LanguageModelDictContent::getProbabilityEntry(
+ProbabilityEntry LanguageModelDictContent::getNgramProbabilityEntry(
         const WordIdArrayView prevWordIds, const int wordId) const {
     if (!prevWordIds.empty()) {
         // TODO: Read n-gram entry.
@@ -44,7 +44,7 @@ ProbabilityEntry LanguageModelDictContent::getProbabilityEntry(
     return ProbabilityEntry::decode(result.mValue, mHasHistoricalInfo);
 }
 
-bool LanguageModelDictContent::setProbabilityEntry(const WordIdArrayView prevWordIds,
+bool LanguageModelDictContent::setNgramProbabilityEntry(const WordIdArrayView prevWordIds,
         const int terminalId, const ProbabilityEntry *const probabilityEntry) {
     if (!prevWordIds.empty()) {
         // TODO: Add n-gram entry.
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.h
index 7f184f1d7..f181dfeee 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.h
@@ -53,9 +53,18 @@ class LanguageModelDictContent {
             const LanguageModelDictContent *const originalContent,
             int *const outNgramCount);
 
-    ProbabilityEntry getProbabilityEntry(const WordIdArrayView prevWordIds, const int wordId) const;
+    ProbabilityEntry getProbabilityEntry(const int wordId) const {
+        return getNgramProbabilityEntry(WordIdArrayView(), wordId);
+    }
+
+    bool setProbabilityEntry(const int wordId, const ProbabilityEntry *const probabilityEntry) {
+        return setNgramProbabilityEntry(WordIdArrayView(), wordId, probabilityEntry);
+    }
+
+    ProbabilityEntry getNgramProbabilityEntry(const WordIdArrayView prevWordIds,
+            const int wordId) const;
 
-    bool setProbabilityEntry(const WordIdArrayView prevWordIds, const int wordId,
+    bool setNgramProbabilityEntry(const WordIdArrayView prevWordIds, const int wordId,
             const ProbabilityEntry *const probabilityEntry);
 
  private:
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.cpp
deleted file mode 100644
index 2425b3b2f..000000000
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.cpp
+++ /dev/null
@@ -1,159 +0,0 @@
-/*
- * Copyright (C) 2013 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.
- */
-
-#include "suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h"
-
-#include "suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h"
-#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
-#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
-#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
-
-namespace latinime {
-
-const ProbabilityEntry ProbabilityDictContent::getProbabilityEntry(const int terminalId) const {
-    if (terminalId < 0 || terminalId >= mSize) {
-        // This method can be called with invalid terminal id during GC.
-        return ProbabilityEntry(0 /* flags */, NOT_A_PROBABILITY);
-    }
-    const BufferWithExtendableBuffer *const buffer = getBuffer();
-    int entryPos = getEntryPos(terminalId);
-    const int flags = buffer->readUintAndAdvancePosition(
-            Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE, &entryPos);
-    const int probability = buffer->readUintAndAdvancePosition(
-            Ver4DictConstants::PROBABILITY_SIZE, &entryPos);
-    if (mHasHistoricalInfo) {
-        const int timestamp = buffer->readUintAndAdvancePosition(
-                Ver4DictConstants::TIME_STAMP_FIELD_SIZE, &entryPos);
-        const int level = buffer->readUintAndAdvancePosition(
-                Ver4DictConstants::WORD_LEVEL_FIELD_SIZE, &entryPos);
-        const int count = buffer->readUintAndAdvancePosition(
-                Ver4DictConstants::WORD_COUNT_FIELD_SIZE, &entryPos);
-        const HistoricalInfo historicalInfo(timestamp, level, count);
-        return ProbabilityEntry(flags, probability, &historicalInfo);
-    } else {
-        return ProbabilityEntry(flags, probability);
-    }
-}
-
-bool ProbabilityDictContent::setProbabilityEntry(const int terminalId,
-        const ProbabilityEntry *const probabilityEntry) {
-    if (terminalId < 0) {
-        return false;
-    }
-    const int entryPos = getEntryPos(terminalId);
-    if (terminalId >= mSize) {
-        ProbabilityEntry dummyEntry;
-        // Write new entry.
-        int writingPos = getBuffer()->getTailPosition();
-        while (writingPos <= entryPos) {
-            // Fulfilling with dummy entries until writingPos.
-            if (!writeEntry(&dummyEntry, writingPos)) {
-                AKLOGE("Cannot write dummy entry. pos: %d, mSize: %d", writingPos, mSize);
-                return false;
-            }
-            writingPos += getEntrySize();
-            mSize++;
-        }
-    }
-    return writeEntry(probabilityEntry, entryPos);
-}
-
-bool ProbabilityDictContent::flushToFile(FILE *const file) const {
-    if (getEntryPos(mSize) < getBuffer()->getTailPosition()) {
-        ProbabilityDictContent probabilityDictContentToWrite(mHasHistoricalInfo);
-        for (int i = 0; i < mSize; ++i) {
-            const ProbabilityEntry probabilityEntry = getProbabilityEntry(i);
-            if (!probabilityDictContentToWrite.setProbabilityEntry(i, &probabilityEntry)) {
-                AKLOGE("Cannot set probability entry in flushToFile. terminalId: %d", i);
-                return false;
-            }
-        }
-        return probabilityDictContentToWrite.flush(file);
-    } else {
-        return flush(file);
-    }
-}
-
-bool ProbabilityDictContent::runGC(
-        const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
-        const ProbabilityDictContent *const originalProbabilityDictContent) {
-    mSize = 0;
-    for (TerminalPositionLookupTable::TerminalIdMap::const_iterator it = terminalIdMap->begin();
-            it != terminalIdMap->end(); ++it) {
-        const ProbabilityEntry probabilityEntry =
-                originalProbabilityDictContent->getProbabilityEntry(it->first);
-        if (!setProbabilityEntry(it->second, &probabilityEntry)) {
-            AKLOGE("Cannot set probability entry in runGC. terminalId: %d", it->second);
-            return false;
-        }
-        mSize++;
-    }
-    return true;
-}
-
-int ProbabilityDictContent::getEntrySize() const {
-    if (mHasHistoricalInfo) {
-        return Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE
-                + Ver4DictConstants::PROBABILITY_SIZE
-                + Ver4DictConstants::TIME_STAMP_FIELD_SIZE
-                + Ver4DictConstants::WORD_LEVEL_FIELD_SIZE
-                + Ver4DictConstants::WORD_COUNT_FIELD_SIZE;
-    } else {
-        return Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE
-                + Ver4DictConstants::PROBABILITY_SIZE;
-    }
-}
-
-int ProbabilityDictContent::getEntryPos(const int terminalId) const {
-    return terminalId * getEntrySize();
-}
-
-bool ProbabilityDictContent::writeEntry(const ProbabilityEntry *const probabilityEntry,
-        const int entryPos) {
-    BufferWithExtendableBuffer *const bufferToWrite = getWritableBuffer();
-    int writingPos = entryPos;
-    if (!bufferToWrite->writeUintAndAdvancePosition(probabilityEntry->getFlags(),
-            Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE, &writingPos)) {
-        AKLOGE("Cannot write flags in probability dict content. pos: %d", writingPos);
-        return false;
-    }
-    if (!bufferToWrite->writeUintAndAdvancePosition(probabilityEntry->getProbability(),
-            Ver4DictConstants::PROBABILITY_SIZE, &writingPos)) {
-        AKLOGE("Cannot write probability in probability dict content. pos: %d", writingPos);
-        return false;
-    }
-    if (mHasHistoricalInfo) {
-        const HistoricalInfo *const historicalInfo = probabilityEntry->getHistoricalInfo();
-        if (!bufferToWrite->writeUintAndAdvancePosition(historicalInfo->getTimeStamp(),
-                Ver4DictConstants::TIME_STAMP_FIELD_SIZE, &writingPos)) {
-            AKLOGE("Cannot write timestamp in probability dict content. pos: %d", writingPos);
-            return false;
-        }
-        if (!bufferToWrite->writeUintAndAdvancePosition(historicalInfo->getLevel(),
-                Ver4DictConstants::WORD_LEVEL_FIELD_SIZE, &writingPos)) {
-            AKLOGE("Cannot write level in probability dict content. pos: %d", writingPos);
-            return false;
-        }
-        if (!bufferToWrite->writeUintAndAdvancePosition(historicalInfo->getCount(),
-                Ver4DictConstants::WORD_COUNT_FIELD_SIZE, &writingPos)) {
-            AKLOGE("Cannot write count in probability dict content. pos: %d", writingPos);
-            return false;
-        }
-    }
-    return true;
-}
-
-} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h
deleted file mode 100644
index 80e992c1c..000000000
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Copyright (C) 2013, 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.
- */
-
-#ifndef LATINIME_PROBABILITY_DICT_CONTENT_H
-#define LATINIME_PROBABILITY_DICT_CONTENT_H
-
-#include <cstdint>
-#include <cstdio>
-
-#include "defines.h"
-#include "suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h"
-#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
-#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
-#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
-
-namespace latinime {
-
-class ProbabilityEntry;
-
-class ProbabilityDictContent : public SingleDictContent {
- public:
-    ProbabilityDictContent(uint8_t *const buffer, const int bufferSize,
-            const bool hasHistoricalInfo)
-            : SingleDictContent(buffer, bufferSize),
-              mHasHistoricalInfo(hasHistoricalInfo),
-              mSize(getBuffer()->getTailPosition() / getEntrySize()) {}
-
-    ProbabilityDictContent(const bool hasHistoricalInfo)
-            : mHasHistoricalInfo(hasHistoricalInfo), mSize(0) {}
-
-    const ProbabilityEntry getProbabilityEntry(const int terminalId) const;
-
-    bool setProbabilityEntry(const int terminalId, const ProbabilityEntry *const probabilityEntry);
-
-    bool flushToFile(FILE *const file) const;
-
-    bool runGC(const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
-            const ProbabilityDictContent *const originalProbabilityDictContent);
-
- private:
-    DISALLOW_COPY_AND_ASSIGN(ProbabilityDictContent);
-
-    int getEntrySize() const;
-
-    int getEntryPos(const int terminalId) const;
-
-    bool writeEntry(const ProbabilityEntry *const probabilityEntry, const int entryPos);
-
-    bool mHasHistoricalInfo;
-    int mSize;
-};
-} // namespace latinime
-#endif /* LATINIME_PROBABILITY_DICT_CONTENT_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
index 125ae1711..3c8008dc4 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
@@ -157,11 +157,6 @@ bool Ver4DictBuffers::flushDictBuffers(FILE *const file) const {
         AKLOGE("Terminal position lookup table cannot be written.");
         return false;
     }
-    // Write probability dict content.
-    if (!mProbabilityDictContent.flushToFile(file)) {
-        AKLOGE("Probability dict content cannot be written.");
-        return false;
-    }
     // Write language model content.
     if (!mLanguageModelDictContent.save(file)) {
         AKLOGE("Language model dict content cannot be written.");
@@ -196,10 +191,6 @@ Ver4DictBuffers::Ver4DictBuffers(MmappedBuffer::MmappedBufferPtr &&headerBuffer,
                   contentBuffers[Ver4DictConstants::TERMINAL_ADDRESS_LOOKUP_TABLE_BUFFER_INDEX],
                   contentBufferSizes[
                           Ver4DictConstants::TERMINAL_ADDRESS_LOOKUP_TABLE_BUFFER_INDEX]),
-          mProbabilityDictContent(
-                  contentBuffers[Ver4DictConstants::PROBABILITY_BUFFER_INDEX],
-                  contentBufferSizes[Ver4DictConstants::PROBABILITY_BUFFER_INDEX],
-                  mHeaderPolicy.hasHistoricalInfoOfWords()),
           mLanguageModelDictContent(
                   ReadWriteByteArrayView(
                           contentBuffers[Ver4DictConstants::LANGUAGE_MODEL_BUFFER_INDEX],
@@ -216,7 +207,6 @@ Ver4DictBuffers::Ver4DictBuffers(const HeaderPolicy *const headerPolicy, const i
         : mHeaderBuffer(nullptr), mDictBuffer(nullptr), mHeaderPolicy(headerPolicy),
           mExpandableHeaderBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
           mExpandableTrieBuffer(maxTrieSize), mTerminalPositionLookupTable(),
-          mProbabilityDictContent(headerPolicy->hasHistoricalInfoOfWords()),
           mLanguageModelDictContent(headerPolicy->hasHistoricalInfoOfWords()),
           mBigramDictContent(headerPolicy->hasHistoricalInfoOfWords()), mShortcutDictContent(),
           mIsUpdatable(true) {}
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h
index d524dd6b7..68027dcb8 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h
@@ -24,7 +24,6 @@
 #include "suggest/policyimpl/dictionary/header/header_policy.h"
 #include "suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h"
 #include "suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.h"
-#include "suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h"
 #include "suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.h"
 #include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
 #include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
@@ -53,7 +52,7 @@ class Ver4DictBuffers {
     AK_FORCE_INLINE bool isNearSizeLimit() const {
         return mExpandableTrieBuffer.isNearSizeLimit()
                 || mTerminalPositionLookupTable.isNearSizeLimit()
-                || mProbabilityDictContent.isNearSizeLimit()
+                || mLanguageModelDictContent.isNearSizeLimit()
                 || mBigramDictContent.isNearSizeLimit()
                 || mShortcutDictContent.isNearSizeLimit();
     }
@@ -82,14 +81,6 @@ class Ver4DictBuffers {
         return &mTerminalPositionLookupTable;
     }
 
-    AK_FORCE_INLINE ProbabilityDictContent *getMutableProbabilityDictContent() {
-        return &mProbabilityDictContent;
-    }
-
-    AK_FORCE_INLINE const ProbabilityDictContent *getProbabilityDictContent() const {
-        return &mProbabilityDictContent;
-    }
-
     AK_FORCE_INLINE LanguageModelDictContent *getMutableLanguageModelDictContent() {
         return &mLanguageModelDictContent;
     }
@@ -144,7 +135,6 @@ class Ver4DictBuffers {
     BufferWithExtendableBuffer mExpandableHeaderBuffer;
     BufferWithExtendableBuffer mExpandableTrieBuffer;
     TerminalPositionLookupTable mTerminalPositionLookupTable;
-    ProbabilityDictContent mProbabilityDictContent;
     LanguageModelDictContent mLanguageModelDictContent;
     BigramDictContent mBigramDictContent;
     ShortcutDictContent mShortcutDictContent;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp
index e7e31e96f..93d4e562d 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp
@@ -27,19 +27,18 @@ const int Ver4DictConstants::MAX_DICTIONARY_SIZE = 8 * 1024 * 1024;
 // limited to 1MB to prevent from inefficient traversing.
 const int Ver4DictConstants::MAX_DICT_EXTENDED_REGION_SIZE = 1 * 1024 * 1024;
 
-// NUM_OF_BUFFERS_FOR_SINGLE_DICT_CONTENT for Trie, TerminalAddressLookupTable and Probability.
+// NUM_OF_BUFFERS_FOR_SINGLE_DICT_CONTENT for Trie and TerminalAddressLookupTable.
+// NUM_OF_BUFFERS_FOR_LANGUAGE_MODEL_DICT_CONTENT for language model.
 // NUM_OF_BUFFERS_FOR_SPARSE_TABLE_DICT_CONTENT for bigram and shortcut.
 const size_t Ver4DictConstants::NUM_OF_CONTENT_BUFFERS_IN_BODY_FILE =
-        NUM_OF_BUFFERS_FOR_SINGLE_DICT_CONTENT * 3
+        NUM_OF_BUFFERS_FOR_SINGLE_DICT_CONTENT * 2
                 + NUM_OF_BUFFERS_FOR_LANGUAGE_MODEL_DICT_CONTENT
                 + NUM_OF_BUFFERS_FOR_SPARSE_TABLE_DICT_CONTENT * 2;
 const int Ver4DictConstants::TRIE_BUFFER_INDEX = 0;
 const int Ver4DictConstants::TERMINAL_ADDRESS_LOOKUP_TABLE_BUFFER_INDEX =
         TRIE_BUFFER_INDEX + NUM_OF_BUFFERS_FOR_SINGLE_DICT_CONTENT;
-const int Ver4DictConstants::PROBABILITY_BUFFER_INDEX =
-        TERMINAL_ADDRESS_LOOKUP_TABLE_BUFFER_INDEX + NUM_OF_BUFFERS_FOR_SINGLE_DICT_CONTENT;
 const int Ver4DictConstants::LANGUAGE_MODEL_BUFFER_INDEX =
-        PROBABILITY_BUFFER_INDEX + NUM_OF_BUFFERS_FOR_SINGLE_DICT_CONTENT;
+        TERMINAL_ADDRESS_LOOKUP_TABLE_BUFFER_INDEX + NUM_OF_BUFFERS_FOR_SINGLE_DICT_CONTENT;
 const int Ver4DictConstants::BIGRAM_BUFFERS_INDEX =
         LANGUAGE_MODEL_BUFFER_INDEX + NUM_OF_BUFFERS_FOR_LANGUAGE_MODEL_DICT_CONTENT;
 const int Ver4DictConstants::SHORTCUT_BUFFERS_INDEX =
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h
index e75db9f75..6950ca70f 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h
@@ -35,7 +35,6 @@ class Ver4DictConstants {
     static const size_t NUM_OF_CONTENT_BUFFERS_IN_BODY_FILE;
     static const int TRIE_BUFFER_INDEX;
     static const int TERMINAL_ADDRESS_LOOKUP_TABLE_BUFFER_INDEX;
-    static const int PROBABILITY_BUFFER_INDEX;
     static const int LANGUAGE_MODEL_BUFFER_INDEX;
     static const int BIGRAM_BUFFERS_INDEX;
     static const int SHORTCUT_BUFFERS_INDEX;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.cpp
index 0a435e91c..731092efd 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.cpp
@@ -18,7 +18,7 @@
 
 #include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
 #include "suggest/policyimpl/dictionary/structure/pt_common/patricia_trie_reading_utils.h"
-#include "suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.h"
 #include "suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h"
 #include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.h"
 #include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
@@ -61,8 +61,9 @@ const PtNodeParams Ver4PatriciaTrieNodeReader::fetchPtNodeInfoFromBufferAndProce
             terminalIdFieldPos += mBuffer->getOriginalBufferSize();
         }
         terminalId = Ver4PatriciaTrieReadingUtils::getTerminalIdAndAdvancePosition(dictBuf, &pos);
+        // TODO: Quit reading probability here.
         const ProbabilityEntry probabilityEntry =
-                mProbabilityDictContent->getProbabilityEntry(terminalId);
+                mLanguageModelDictContent->getProbabilityEntry(terminalId);
         if (probabilityEntry.hasHistoricalInfo()) {
             probability = ForgettingCurveUtils::decodeProbability(
                     probabilityEntry.getHistoricalInfo(), mHeaderPolicy);
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h
index 22ed4a6c0..a91ad5728 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h
@@ -25,18 +25,18 @@ namespace latinime {
 
 class BufferWithExtendableBuffer;
 class HeaderPolicy;
-class ProbabilityDictContent;
+class LanguageModelDictContent;
 
 /*
  * This class is used for helping to read nodes of ver4 patricia trie. This class handles moved
- * node and reads node attributes including probability form probabilityBuffer.
+ * node and reads node attributes including probability form language model.
  */
 class Ver4PatriciaTrieNodeReader : public PtNodeReader {
  public:
     Ver4PatriciaTrieNodeReader(const BufferWithExtendableBuffer *const buffer,
-            const ProbabilityDictContent *const probabilityDictContent,
+            const LanguageModelDictContent *const languageModelDictContent,
             const HeaderPolicy *const headerPolicy)
-            : mBuffer(buffer), mProbabilityDictContent(probabilityDictContent),
+            : mBuffer(buffer), mLanguageModelDictContent(languageModelDictContent),
               mHeaderPolicy(headerPolicy) {}
 
     ~Ver4PatriciaTrieNodeReader() {}
@@ -50,7 +50,7 @@ class Ver4PatriciaTrieNodeReader : public PtNodeReader {
     DISALLOW_COPY_AND_ASSIGN(Ver4PatriciaTrieNodeReader);
 
     const BufferWithExtendableBuffer *const mBuffer;
-    const ProbabilityDictContent *const mProbabilityDictContent;
+    const LanguageModelDictContent *const mLanguageModelDictContent;
     const HeaderPolicy *const mHeaderPolicy;
 
     const PtNodeParams fetchPtNodeInfoFromBufferAndProcessMovedPtNode(const int ptNodePos,
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp
index 3d8da9173..1a311b156 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp
@@ -143,11 +143,11 @@ bool Ver4PatriciaTrieNodeWriter::updatePtNodeUnigramProperty(
         return false;
     }
     const ProbabilityEntry originalProbabilityEntry =
-            mBuffers->getProbabilityDictContent()->getProbabilityEntry(
+            mBuffers->getLanguageModelDictContent()->getProbabilityEntry(
                     toBeUpdatedPtNodeParams->getTerminalId());
     const ProbabilityEntry probabilityEntry = createUpdatedEntryFrom(&originalProbabilityEntry,
             unigramProperty);
-    return mBuffers->getMutableProbabilityDictContent()->setProbabilityEntry(
+    return mBuffers->getMutableLanguageModelDictContent()->setProbabilityEntry(
             toBeUpdatedPtNodeParams->getTerminalId(), &probabilityEntry);
 }
 
@@ -158,14 +158,14 @@ bool Ver4PatriciaTrieNodeWriter::updatePtNodeProbabilityAndGetNeedsToKeepPtNodeA
         return false;
     }
     const ProbabilityEntry originalProbabilityEntry =
-            mBuffers->getProbabilityDictContent()->getProbabilityEntry(
+            mBuffers->getLanguageModelDictContent()->getProbabilityEntry(
                     toBeUpdatedPtNodeParams->getTerminalId());
     if (originalProbabilityEntry.hasHistoricalInfo()) {
         const HistoricalInfo historicalInfo = ForgettingCurveUtils::createHistoricalInfoToSave(
                 originalProbabilityEntry.getHistoricalInfo(), mHeaderPolicy);
         const ProbabilityEntry probabilityEntry =
                 originalProbabilityEntry.createEntryWithUpdatedHistoricalInfo(&historicalInfo);
-        if (!mBuffers->getMutableProbabilityDictContent()->setProbabilityEntry(
+        if (!mBuffers->getMutableLanguageModelDictContent()->setProbabilityEntry(
                 toBeUpdatedPtNodeParams->getTerminalId(), &probabilityEntry)) {
             AKLOGE("Cannot write updated probability entry. terminalId: %d",
                     toBeUpdatedPtNodeParams->getTerminalId());
@@ -218,8 +218,8 @@ bool Ver4PatriciaTrieNodeWriter::writeNewTerminalPtNodeAndAdvancePosition(
     ProbabilityEntry newProbabilityEntry;
     const ProbabilityEntry probabilityEntryToWrite = createUpdatedEntryFrom(
             &newProbabilityEntry, unigramProperty);
-    return mBuffers->getMutableProbabilityDictContent()->setProbabilityEntry(terminalId,
-            &probabilityEntryToWrite);
+    return mBuffers->getMutableLanguageModelDictContent()->setProbabilityEntry(
+            terminalId, &probabilityEntryToWrite);
 }
 
 bool Ver4PatriciaTrieNodeWriter::addNewBigramEntry(
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
index 4bf8050e1..2b92d5bea 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
@@ -452,7 +452,7 @@ const WordProperty Ver4PatriciaTriePolicy::getWordProperty(const int *const code
     std::vector<int> codePointVector(ptNodeParams.getCodePoints(),
             ptNodeParams.getCodePoints() + ptNodeParams.getCodePointCount());
     const ProbabilityEntry probabilityEntry =
-            mBuffers->getProbabilityDictContent()->getProbabilityEntry(
+            mBuffers->getLanguageModelDictContent()->getProbabilityEntry(
                     ptNodeParams.getTerminalId());
     const HistoricalInfo *const historicalInfo = probabilityEntry.getHistoricalInfo();
     // Fetch bigram information.
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
index 76b3404c4..faad4290d 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
@@ -46,7 +46,7 @@ class Ver4PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
                       mBuffers->getTerminalPositionLookupTable(), mHeaderPolicy),
               mShortcutPolicy(mBuffers->getMutableShortcutDictContent(),
                       mBuffers->getTerminalPositionLookupTable()),
-              mNodeReader(mDictBuffer, mBuffers->getProbabilityDictContent(), mHeaderPolicy),
+              mNodeReader(mDictBuffer, mBuffers->getLanguageModelDictContent(), mHeaderPolicy),
               mPtNodeArrayReader(mDictBuffer),
               mNodeWriter(mDictBuffer, mBuffers.get(), mHeaderPolicy, &mNodeReader,
                       &mPtNodeArrayReader, &mBigramPolicy, &mShortcutPolicy),
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp
index 0e658f8e3..4220312e0 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp
@@ -75,7 +75,7 @@ bool Ver4PatriciaTrieWritingHelper::runGC(const int rootPtNodeArrayPos,
         const HeaderPolicy *const headerPolicy, Ver4DictBuffers *const buffersToWrite,
         int *const outUnigramCount, int *const outBigramCount) {
     Ver4PatriciaTrieNodeReader ptNodeReader(mBuffers->getTrieBuffer(),
-            mBuffers->getProbabilityDictContent(), headerPolicy);
+            mBuffers->getLanguageModelDictContent(), headerPolicy);
     Ver4PtNodeArrayReader ptNodeArrayReader(mBuffers->getTrieBuffer());
     Ver4BigramListPolicy bigramPolicy(mBuffers->getMutableBigramDictContent(),
             mBuffers->getTerminalPositionLookupTable(), headerPolicy);
@@ -138,7 +138,7 @@ bool Ver4PatriciaTrieWritingHelper::runGC(const int rootPtNodeArrayPos,
 
     // Create policy instances for the GCed dictionary.
     Ver4PatriciaTrieNodeReader newPtNodeReader(buffersToWrite->getTrieBuffer(),
-            buffersToWrite->getProbabilityDictContent(), headerPolicy);
+            buffersToWrite->getLanguageModelDictContent(), headerPolicy);
     Ver4PtNodeArrayReader newPtNodeArrayreader(buffersToWrite->getTrieBuffer());
     Ver4BigramListPolicy newBigramPolicy(buffersToWrite->getMutableBigramDictContent(),
             buffersToWrite->getTerminalPositionLookupTable(), headerPolicy);
@@ -154,8 +154,8 @@ bool Ver4PatriciaTrieWritingHelper::runGC(const int rootPtNodeArrayPos,
         return false;
     }
     // Run GC for probability dict content.
-    if (!buffersToWrite->getMutableProbabilityDictContent()->runGC(&terminalIdMap,
-            mBuffers->getProbabilityDictContent())) {
+    if (!buffersToWrite->getMutableLanguageModelDictContent()->runGC(&terminalIdMap,
+            mBuffers->getLanguageModelDictContent(), nullptr /* outNgramCount */)) {
         return false;
     }
     // Run GC for bigram dict content.
@@ -201,7 +201,7 @@ bool Ver4PatriciaTrieWritingHelper::truncateUnigrams(
             continue;
         }
         const ProbabilityEntry probabilityEntry =
-                mBuffers->getProbabilityDictContent()->getProbabilityEntry(i);
+                mBuffers->getLanguageModelDictContent()->getProbabilityEntry(i);
         const int probability = probabilityEntry.hasHistoricalInfo() ?
                 ForgettingCurveUtils::decodeProbability(
                         probabilityEntry.getHistoricalInfo(), mBuffers->getHeaderPolicy()) :
diff --git a/native/jni/tests/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content_test.cpp b/native/jni/tests/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content_test.cpp
index bf08344dd..6eef2040b 100644
--- a/native/jni/tests/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content_test.cpp
+++ b/native/jni/tests/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content_test.cpp
@@ -30,9 +30,9 @@ TEST(LanguageModelDictContentTest, TestUnigramProbability) {
     const int probability = 10;
     const int wordId = 100;
     const ProbabilityEntry probabilityEntry(flag, probability);
-    LanguageModelDictContent.setProbabilityEntry(WordIdArrayView(), wordId, &probabilityEntry);
+    LanguageModelDictContent.setProbabilityEntry(wordId, &probabilityEntry);
     const ProbabilityEntry entry =
-            LanguageModelDictContent.getProbabilityEntry(WordIdArrayView(), wordId);
+            LanguageModelDictContent.getProbabilityEntry(wordId);
     EXPECT_EQ(flag, entry.getFlags());
     EXPECT_EQ(probability, entry.getProbability());
 }
@@ -47,9 +47,8 @@ TEST(LanguageModelDictContentTest, TestUnigramProbabilityWithHistoricalInfo) {
     const int wordId = 100;
     const HistoricalInfo historicalInfo(timestamp, level, count);
     const ProbabilityEntry probabilityEntry(flag, NOT_A_PROBABILITY, &historicalInfo);
-    LanguageModelDictContent.setProbabilityEntry(WordIdArrayView(), wordId, &probabilityEntry);
-    const ProbabilityEntry entry =
-            LanguageModelDictContent.getProbabilityEntry(WordIdArrayView(), wordId);
+    LanguageModelDictContent.setProbabilityEntry(wordId, &probabilityEntry);
+    const ProbabilityEntry entry = LanguageModelDictContent.getProbabilityEntry(wordId);
     EXPECT_EQ(flag, entry.getFlags());
     EXPECT_EQ(timestamp, entry.getHistoricalInfo()->getTimeStamp());
     EXPECT_EQ(level, entry.getHistoricalInfo()->getLevel());