/*
* Copyright [2012-2014] PayPal Software Foundation
*
* 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 ml.shifu.shifu.udf;
import ml.shifu.shifu.container.obj.ColumnConfig;
import ml.shifu.shifu.container.obj.ModelConfig;
import ml.shifu.shifu.container.obj.RawSourceData.SourceType;
import ml.shifu.shifu.util.CommonUtils;
import org.apache.pig.EvalFunc;
import org.apache.pig.tools.pigstats.PigStatusReporter;
import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* AbstractTrainerUDF class is the abstract class for most UDF
* It will load and host @ModelConfig and @ColumnConfig, and find target column id
*/
public abstract class AbstractTrainerUDF<T> extends EvalFunc<T> {
protected ModelConfig modelConfig;
protected List<ColumnConfig> columnConfigList;
// Need to specify the default value as -1, or it won't report error if it doesn't find target column
protected int tagColumnNum = -1;
// cache tags in set for search
protected Set<String> posTagSet;
protected Set<String> negTagSet;
protected Set<String> tagSet;
/**
* Constructor with SourceType, ModelConfig path and ColumnConfig path
*
* @param source
* - source type of ModelConfig file and ColumnConfig file
* @param pathModelConfig
* - the path of ModelConfig
* @param pathColumnConfig
* - the path of ColumnConfig
* @throws IOException
* throw exceptions when loading configuration
*/
public AbstractTrainerUDF(String source, String pathModelConfig, String pathColumnConfig) throws IOException {
SourceType sourceType = SourceType.valueOf(source);
if(pathModelConfig != null) {
modelConfig = CommonUtils.loadModelConfig(pathModelConfig, sourceType);
}
columnConfigList = CommonUtils.loadColumnConfigList(pathColumnConfig, sourceType);
for(ColumnConfig config: columnConfigList) {
if(config.isTarget()) {
tagColumnNum = config.getColumnNum();
break;
}
}
if(tagColumnNum == -1) {
throw new RuntimeException("No Valid Target.");
}
if(modelConfig != null && modelConfig.getPosTags() != null) {
this.posTagSet = new HashSet<String>(modelConfig.getPosTags());
}
if(modelConfig != null && modelConfig.getNegTags() != null) {
this.negTagSet = new HashSet<String>(modelConfig.getNegTags());
}
if(modelConfig != null && modelConfig.getFlattenTags() != null) {
this.tagSet = new HashSet<String>(modelConfig.getFlattenTags());
}
}
/**
* Constructor with SourceType, and ColumnConfig path
*
* @param source
* - source type of ColumnConfig file
* @param pathColumnConfig
* - the path of ColumnConfig
* @throws IOException
* throw exceptions when loading configuration
*/
public AbstractTrainerUDF(String source, String pathColumnConfig) throws IOException {
this(source, null, pathColumnConfig);
}
/*
* Check whether is a pig environment, for example, in unit test, PigStatusReporter.getInstance() is null
*/
@SuppressWarnings("deprecation")
protected boolean isPigEnabled(String group, String counter) {
return PigStatusReporter.getInstance() != null
&& PigStatusReporter.getInstance().getCounter(group, counter) != null;
}
}