package com.cloutree.modelevaluator.impl.r;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.rosuda.JRI.REXP;
import org.rosuda.JRI.RList;
import org.rosuda.JRI.RVector;
import org.rosuda.JRI.Rengine;
import com.cloutree.modelevaluator.PredictiveModel;
import com.cloutree.modelevaluator.PredictiveModelFile;
import com.cloutree.modelevaluator.PredictiveModelResult;
import com.cloutree.modelevaluator.exception.InvalidModelException;
import com.cloutree.modelevaluator.impl.pmml.PmmlPredictiveModel;
import com.cloutree.modelevaluator.scripting.ScriptFactory;
import com.cloutree.modelevaluator.scripting.ScriptProcessor;
/**
* Cloutree Modelevaluator
* A wrapper for different predictive analysis libraries to be used by Java Apps.
*
* Copyright (C) 2014 Marc Schachtel
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* {@link PredictiveModel} implenentation for Native R.
*
* @author mschachtel
*
* Since 04.12.2013
*
*/
public class RPredictiveModel implements PredictiveModel {
static Logger log = Logger.getLogger(PmmlPredictiveModel.class.getName());
Rengine engine;
PredictiveModelFile modelFile;
String preProcessor;
String postProcessor;
public RPredictiveModel() {
this.engine = new Rengine();
if (!this.engine.waitForR())
{
log.log(Level.SEVERE, "Not able to load R - Please make sure it is installed properly");
return;
}
}
@SuppressWarnings("unchecked")
public PredictiveModelResult eval(Map<String, Object> parameters) {
RPredictiveModelResult result = new RPredictiveModelResult(this, parameters);
//Check some stuff
if(this.modelFile == null || this.modelFile.getFile() == null) {
log.log(Level.WARNING, "Model-File not set properly");
result.addError("Model-File not set properly");
return result;
}
ScriptProcessor processor = ScriptFactory.getScriptProcessor(ScriptFactory.Types.JAVASCRIPT);
// Do PreProcessing on Parameters
if(this.preProcessor != null && !this.preProcessor.isEmpty())
processor.doScriptProcessing(this.preProcessor, parameters);
// Compile parameters for R
String rParamaterAssignString = "params <- data.frame(";
boolean initial = true;
for(String key : parameters.keySet()) {
try {
String obj = (String)parameters.get(key);
if(initial) {
rParamaterAssignString = rParamaterAssignString + key + "=" + obj;
initial= false;
} else {
rParamaterAssignString = rParamaterAssignString + "," + key + "=" + obj;
}
} catch(ClassCastException e) {
log.log(Level.WARNING, "Parameter " + key + "->" + parameters.get(key) + " seems to be no String, which was expected for native R! Continouing without this parameter now...");
result.addError("Parameter " + key + "->" + parameters.get(key) + " could not be read (String expected)!");
}
}
//Get model name out of file
this.engine.eval("modelname<-load('"+ this.modelFile.getFile().getPath());
String modelName = this.engine.eval("modelname").asString();
REXP rResult = this.engine.eval("predict(" + modelName + "," + rParamaterAssignString);
if(rResult == null || rResult.getType() == REXP.XT_NULL) {
result.addError("Empty R result, model has an error");
} else {
Map<String, Object> tempPredictions = new HashMap<String, Object>();
this.processRResult(rResult, tempPredictions, "result");
}
// Do Post-Processing
if(this.postProcessor != null && !this.postProcessor.isEmpty())
processor.doScriptProcessing(this.postProcessor, (Map<String, Object>) result.getOutputValues());
processor.doScriptProcessing(this.postProcessor, (Map<String, Object>) result.getPredictedValues());
return result;
}
public void setPredictiveModelFile(PredictiveModelFile file) {
this.modelFile = file;
}
public Map<String, String> getParameterSpecs() {
// Not supported by native R
log.log(Level.WARNING, "Parameter Specs requested but not yet supported by native R");
return null;
}
public boolean validateModel() throws InvalidModelException {
// Not yet supported
log.log(Level.WARNING, "Model tried to be validated but not supported by native R");
return true;
}
public void setPreProcessor(String script) {
this.preProcessor = script;
}
public void setPostProcessor(String script) {
this.postProcessor = script;
}
private void processRResult(REXP rResult, Map<String, Object> predictedValues, String name) {
switch(rResult.getType()) {
case REXP.XT_ARRAY_DOUBLE:
double[] doubleArray = rResult.asDoubleArray();
for(int i=0; i<doubleArray.length; i++) {
predictedValues.put(name + "_" + Integer.toString(i), doubleArray[i]);
}
break;
case REXP.XT_ARRAY_INT:
int[] intArray = rResult.asIntArray();
for(int i=0; i<intArray.length; i++) {
predictedValues.put(name + "_" + Integer.toString(i), intArray[i]);
}
break;
case REXP.XT_ARRAY_STR:
String[] strArray = rResult.asStringArray();
for(int i=0; i<strArray.length; i++) {
predictedValues.put(name + "_" + Integer.toString(i), strArray[i]);
}
break;
case REXP.XT_BOOL:
boolean bool = rResult.asBool().isTRUE();
predictedValues.put(name, bool);
break;
case REXP.XT_DOUBLE:
double doub = rResult.asDouble();
predictedValues.put(name, doub);
break;
case REXP.XT_INT:
int integ = rResult.asInt();
predictedValues.put(name, integ);
break;
case REXP.XT_STR:
String str = rResult.asString();
predictedValues.put(name, str);
break;
case REXP.XT_VECTOR:
RVector rVector = rResult.asVector();
Map<String, Object> vectorSubResult = new HashMap<String, Object>();
for (Object vName : rVector.getNames()) {
processRResult(rVector.at(vName.toString()), vectorSubResult, vName.toString());
}
predictedValues.put(name, vectorSubResult);
break;
case REXP.XT_LIST:
RList rList = rResult.asList();
Map<String, Object> listSubResult = new HashMap<String, Object>();
for(String lName : rList.keys()) {
processRResult(rList.at(lName), listSubResult, lName);
}
predictedValues.put(name, listSubResult);
break;
default:
log.log(Level.WARNING, "Unsopported R expression/result type " + rResult.getType() + ". Will not add it to predicted values");
}
}
/* (non-Javadoc)
* @see com.cloutree.modelevaluator.PredictiveModel#getPreprocessor()
*/
@Override
public String getPreProcessor() {
return this.preProcessor;
}
/* (non-Javadoc)
* @see com.cloutree.modelevaluator.PredictiveModel#getPostProcessor()
*/
@Override
public String getPostProcessor() {
return this.postProcessor;
}
}