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Create a code point table based on occurrence counts. 

Bug:17097992
Change-Id: Ifd76dbd4d385d800af416368e25c9e56a76d0fbf
main
Akifumi Yoshimoto 2014-09-25 19:58:33 +09:00
parent f4329f7fff
commit 8a6e96d286
5 changed files with 164 additions and 2 deletions
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1
java/src/com/android/inputmethod/latin/makedict/DictionaryHeader.java
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@ -47,6 +47,7 @@ public final class DictionaryHeader {
public static final String MAX_UNIGRAM_COUNT_KEY = "MAX_UNIGRAM_COUNT";
public static final String MAX_BIGRAM_COUNT_KEY = "MAX_BIGRAM_COUNT";
public static final String ATTRIBUTE_VALUE_TRUE = "1";
public static final String CODE_POINT_TABLE_KEY = "codePointTable";
public DictionaryHeader(final int headerSize, final DictionaryOptions dictionaryOptions,
final FormatOptions formatOptions) throws UnsupportedFormatException {

2
java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
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@ -237,6 +237,8 @@ public final class FormatSpec {
static final int UINT16_MAX = 0xFFFF;
static final int UINT24_MAX = 0xFFFFFF;
static final int MSB8 = 0x80;
static final int MINIMAL_ONE_BYTE_CHARACTER_VALUE = 0x20;
static final int MAXIMAL_ONE_BYTE_CHARACTER_VALUE = 0xFF;
/**
* Options about file format.

20
tests/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
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@ -27,6 +27,8 @@ import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map.Entry;
/**
* Encodes binary files for a FusionDictionary.
@ -791,10 +793,12 @@ public class BinaryDictEncoderUtils {
* @param destination the stream to write the file header to.
* @param dict the dictionary to write.
* @param formatOptions file format options.
* @param codePointOccurrenceArray code points ordered by occurrence count.
* @return the size of the header.
*/
/* package */ static int writeDictionaryHeader(final OutputStream destination,
final FusionDictionary dict, final FormatOptions formatOptions)
final FusionDictionary dict, final FormatOptions formatOptions,
final ArrayList<Entry<Integer, Integer>> codePointOccurrenceArray)
throws IOException, UnsupportedFormatException {
final int version = formatOptions.mVersion;
if (version < FormatSpec.MINIMUM_SUPPORTED_VERSION
@ -833,6 +837,9 @@ public class BinaryDictEncoderUtils {
CharEncoding.writeString(headerBuffer, key);
CharEncoding.writeString(headerBuffer, value);
}
// TODO: Write out the code point table.
final int size = headerBuffer.size();
final byte[] bytes = headerBuffer.toByteArray();
// Write out the header size.
@ -845,4 +852,15 @@ public class BinaryDictEncoderUtils {
headerBuffer.close();
return size;
}
static final class CodePointTable {
final HashMap<Integer, Integer> mCodePointToOneByteCodeMap;
final ArrayList<Entry<Integer, Integer>> mCodePointOccurrenceArray;
CodePointTable(final HashMap<Integer, Integer> codePointToOneByteCodeMap,
final ArrayList<Entry<Integer, Integer>> codePointOccurrenceArray) {
mCodePointToOneByteCodeMap = codePointToOneByteCodeMap;
mCodePointOccurrenceArray = codePointOccurrenceArray;
}
}
}

52
tests/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
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@ -18,6 +18,7 @@ package com.android.inputmethod.latin.makedict;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncoding;
import com.android.inputmethod.latin.makedict.BinaryDictEncoderUtils.CodePointTable;
import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
@ -28,7 +29,11 @@ import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map.Entry;
/**
* An implementation of DictEncoder for version 2 binary dictionary.
@ -73,6 +78,46 @@ public class Ver2DictEncoder implements DictEncoder {
}
}
// Package for testing
static CodePointTable makeCodePointTable(final FusionDictionary dict) {
final HashMap<Integer, Integer> codePointOccurrenceCounts = new HashMap<>();
for (final WordProperty word : dict) {
// Store per code point occurrence
final String wordString = word.mWord;
for (int i = 0; i < wordString.length(); ++i) {
final int codePoint = Character.codePointAt(wordString, i);
if (codePointOccurrenceCounts.containsKey(codePoint)) {
codePointOccurrenceCounts.put(codePoint,
codePointOccurrenceCounts.get(codePoint) + 1);
} else {
codePointOccurrenceCounts.put(codePoint, 1);
}
}
}
final ArrayList<Entry<Integer, Integer>> codePointOccurrenceArray =
new ArrayList<>(codePointOccurrenceCounts.entrySet());
// Descending order sort by occurrence (value side)
Collections.sort(codePointOccurrenceArray, new Comparator<Entry<Integer, Integer>>() {
@Override
public int compare(final Entry<Integer, Integer> a, final Entry<Integer, Integer> b) {
return b.getValue().compareTo(a.getValue());
}
});
int currentCodePointTableIndex = FormatSpec.MINIMAL_ONE_BYTE_CHARACTER_VALUE;
// Temporary map for writing of nodes
final HashMap<Integer, Integer> codePointToOneByteCodeMap = new HashMap<>();
for (final Entry<Integer, Integer> entry : codePointOccurrenceArray) {
// Put a relation from the original code point to the one byte code.
codePointToOneByteCodeMap.put(entry.getKey(), currentCodePointTableIndex);
if (FormatSpec.MAXIMAL_ONE_BYTE_CHARACTER_VALUE < ++currentCodePointTableIndex) {
break;
}
}
// codePointToOneByteCodeMap for writing the trie
// codePointOccurrenceArray for writing the header
return new CodePointTable(codePointToOneByteCodeMap, codePointOccurrenceArray);
}
@Override
public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
throws IOException, UnsupportedFormatException {
@ -85,7 +130,12 @@ public class Ver2DictEncoder implements DictEncoder {
if (mOutStream == null) {
openStream();
}
BinaryDictEncoderUtils.writeDictionaryHeader(mOutStream, dict, formatOptions);
// Make code point conversion table ordered by occurrence of code points
final CodePointTable codePointTable = makeCodePointTable(dict);
BinaryDictEncoderUtils.writeDictionaryHeader(mOutStream, dict, formatOptions,
codePointTable.mCodePointOccurrenceArray);
// Addresses are limited to 3 bytes, but since addresses can be relative to each node
// array, the structure itself is not limited to 16MB. However, if it is over 16MB deciding

91
tests/src/com/android/inputmethod/latin/makedict/Ver2DictEncoderTests.java Normal file
View File

@ -0,0 +1,91 @@
/*
* Copyright (C) 2014 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 com.android.inputmethod.latin.makedict;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map.Entry;
import com.android.inputmethod.latin.makedict.BinaryDictEncoderUtils.CodePointTable;
import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.LargeTest;
import android.util.Log;
/**
* Unit tests for Ver2DictEncoder
*/
@LargeTest
public class Ver2DictEncoderTests extends AndroidTestCase {
private static final String TAG = Ver2DictEncoderTests.class.getSimpleName();
private static final int UNIGRAM_FREQ = 10;
public void testCodePointTable() {
final String[] wordSource = {"words", "used", "for", "testing", "a", "code point", "table"};
final List<String> words = Arrays.asList(wordSource);
final String correctCodePointTable = "eotdsanirfg bclwup";
final String correctCodePointOccurrenceArrayString =
"10141164111411531003110297210521142103111911171108198199132111211021";
final String correctCodePointExpectedMapString = "323433363538373940494147454644424348";
final String dictName = "codePointTableTest";
final String dictVersion = Long.toString(System.currentTimeMillis());
final FormatSpec.FormatOptions formatOptions =
new FormatSpec.FormatOptions(FormatSpec.VERSION2);
final FusionDictionary sourcedict = new FusionDictionary(new PtNodeArray(),
BinaryDictUtils.makeDictionaryOptions(dictName, dictVersion, formatOptions));
addUnigrams(sourcedict, words, null /* shortcutMap */);
final CodePointTable codePointTable = Ver2DictEncoder.makeCodePointTable(sourcedict);
// Check if mCodePointOccurrenceArray is correct
final StringBuilder codePointOccurrenceArrayString = new StringBuilder();
for (Entry<Integer, Integer> entry : codePointTable.mCodePointOccurrenceArray) {
codePointOccurrenceArrayString.append(entry.getKey());
codePointOccurrenceArrayString.append(entry.getValue());
}
assertEquals(codePointOccurrenceArrayString.toString(),
correctCodePointOccurrenceArrayString);
// Check if mCodePointToOneByteCodeMap is correct
final StringBuilder codePointExpectedMapString = new StringBuilder();
for (int i = 0; i < correctCodePointTable.length(); ++i) {
codePointExpectedMapString.append(codePointTable.mCodePointToOneByteCodeMap.get(
correctCodePointTable.codePointAt(i)));
}
assertEquals(codePointExpectedMapString.toString(), correctCodePointExpectedMapString);
}
/**
* Adds unigrams to the dictionary.
*/
private void addUnigrams(final FusionDictionary dict, final List<String> words,
final HashMap<String, List<String>> shortcutMap) {
for (final String word : words) {
final ArrayList<WeightedString> shortcuts = new ArrayList<>();
if (shortcutMap != null && shortcutMap.containsKey(word)) {
for (final String shortcut : shortcutMap.get(word)) {
shortcuts.add(new WeightedString(shortcut, UNIGRAM_FREQ));
}
}
dict.add(word, new ProbabilityInfo(UNIGRAM_FREQ),
(shortcutMap == null) ? null : shortcuts, false /* isNotAWord */);
}
}
}