import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
<BUG>public class Extractor {
int steps = 3;</BUG>
float initial_sigma = 1.6f;
double bg = 0.0;
int fdsize = 4;

import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
public class Extractor implements LocalFeatureExtractor{
int steps = 3;
float initial_sigma = 1.6f;
double bg = 0.0;
int fdsize = 4;
