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/*
* 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.
*/
package com.android.inputmethod.latin;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.LargeTest;
import com.android.inputmethod.latin.makedict.FormatSpec;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
@LargeTest
public class BinaryDictionaryDecayingTests extends AndroidTestCase {
private static final String TEST_DICT_FILE_EXTENSION = ".testDict";
private static final String TEST_LOCALE = "test";
// Note that these are corresponding definitions in native code in
// latinime::DynamicPatriciaTriePolicy.
private static final String SET_NEEDS_TO_DECAY_FOR_TESTING_KEY =
"SET_NEEDS_TO_DECAY_FOR_TESTING";
private static final int DUMMY_PROBABILITY = 0;
@Override
protected void setUp() throws Exception {
super.setUp();
}
@Override
protected void tearDown() throws Exception {
super.tearDown();
}
private void forcePassingShortTime(final BinaryDictionary binaryDictionary) {
// Entries having low probability would be suppressed once in 3 GCs.
final int count = 3;
for (int i = 0; i < count; i++) {
binaryDictionary.getPropertyForTests(SET_NEEDS_TO_DECAY_FOR_TESTING_KEY);
binaryDictionary.flushWithGC();
}
}
private void forcePassingLongTime(final BinaryDictionary binaryDictionary) {
// Currently, probabilities are decayed when GC is run. All entries that have never been
// typed in 128 GCs would be removed.
final int count = 128;
for (int i = 0; i < count; i++) {
binaryDictionary.getPropertyForTests(SET_NEEDS_TO_DECAY_FOR_TESTING_KEY);
binaryDictionary.flushWithGC();
}
}
private File createEmptyDictionaryAndGetFile(final String filename) throws IOException {
final File file = File.createTempFile(filename, TEST_DICT_FILE_EXTENSION,
getContext().getCacheDir());
Map<String, String> attributeMap = new HashMap<String, String>();
attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
attributeMap.put(FormatSpec.FileHeader.USES_FORGETTING_CURVE_ATTRIBUTE,
FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
3 /* dictVersion */, attributeMap)) {
return file;
} else {
throw new IOException("Empty dictionary cannot be created.");
}
}
public void testAddValidAndInvalidWords() {
File dictFile = null;
try {
dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
} catch (IOException e) {
fail("IOException while writing an initial dictionary : " + e);
}
BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
assertFalse(binaryDictionary.isValidWord("a"));
binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
assertFalse(binaryDictionary.isValidWord("a"));
binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
assertFalse(binaryDictionary.isValidWord("a"));
binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
assertTrue(binaryDictionary.isValidWord("a"));
binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
assertTrue(binaryDictionary.isValidWord("b"));
final int unigramProbability = binaryDictionary.getFrequency("a");
binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
assertFalse(binaryDictionary.isValidBigram("a", "b"));
binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
assertFalse(binaryDictionary.isValidBigram("a", "b"));
binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
assertFalse(binaryDictionary.isValidBigram("a", "b"));
binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
assertTrue(binaryDictionary.isValidBigram("a", "b"));
binaryDictionary.addUnigramWord("c", DUMMY_PROBABILITY);
binaryDictionary.addBigramWords("a", "c", DUMMY_PROBABILITY);
assertTrue(binaryDictionary.isValidBigram("a", "c"));
binaryDictionary.close();
dictFile.delete();
}
// TODO: Add large tests.
public void testDecayingProbability() {
File dictFile = null;
try {
dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
} catch (IOException e) {
fail("IOException while writing an initial dictionary : " + e);
}
BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
assertTrue(binaryDictionary.isValidWord("a"));
forcePassingShortTime(binaryDictionary);
assertFalse(binaryDictionary.isValidWord("a"));
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
forcePassingShortTime(binaryDictionary);
assertTrue(binaryDictionary.isValidWord("a"));
forcePassingLongTime(binaryDictionary);
assertFalse(binaryDictionary.isValidWord("a"));
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
assertTrue(binaryDictionary.isValidBigram("a", "b"));
forcePassingShortTime(binaryDictionary);
assertFalse(binaryDictionary.isValidBigram("a", "b"));
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
assertTrue(binaryDictionary.isValidBigram("a", "b"));
forcePassingShortTime(binaryDictionary);
assertTrue(binaryDictionary.isValidBigram("a", "b"));
forcePassingLongTime(binaryDictionary);
assertFalse(binaryDictionary.isValidBigram("a", "b"));
binaryDictionary.close();
dictFile.delete();
}
}
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