/*
* 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.facebook.presto.ml;
import com.facebook.presto.ml.type.ModelType;
import com.google.common.base.Throwables;
import libsvm.svm;
import libsvm.svm_model;
import libsvm.svm_parameter;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import static com.facebook.presto.ml.type.ClassifierType.CLASSIFIER;
import static com.google.common.base.Preconditions.checkNotNull;
public class SvmClassifier
extends AbstractSvmModel
implements Classifier
{
public SvmClassifier()
{
}
private SvmClassifier(svm_model model)
{
super(model);
}
public static SvmClassifier deserialize(byte[] modelData)
{
// TODO do something with the hyperparameters
try {
svm_model model = svm.svm_load_model(new BufferedReader(new InputStreamReader(new ByteArrayInputStream(modelData))));
return new SvmClassifier(model);
}
catch (IOException e) {
throw Throwables.propagate(e);
}
}
@Override
public int classify(FeatureVector features)
{
checkNotNull(model, "model is null");
return (int) svm.svm_predict(model, toSvmNodes(features));
}
@Override
public ModelType getType()
{
return CLASSIFIER;
}
@Override
protected int getLibsvmType()
{
return svm_parameter.C_SVC;
}
}