目前使用的Java版本pom依赖
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<dependency>
<groupId>tw.edu.ntu.csie</groupId>
<artifactId>libsvm</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>de.bwaldvogel</groupId>
<artifactId>liblinear</artifactId>
<version>1.95</version>
</dependency>
数据（下标，值（index,value））封装，Java版还是看liblinear,libsvm是C风格的各种不习惯。FeatureNode代表一条数据，包含index,value
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public class FeatureNode implements Feature {
public final int index;
public double value;
public FeatureNode( final int index, final double value ) {
if (index < 0) throw new IllegalArgumentException("index must be >= 0");
this.index = index;
this.value = value;
}
/**
* @since 1.9
*/
public int getIndex() {
return index;
}
/**
* @since 1.9
*/
public double getValue() {
return value;
}
/**
* @since 1.9
*/
public void setValue(double value) {
this.value = value;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + index;
long temp;
temp = Double.doubleToLongBits(value);
result = prime * result + (int)(temp ^ (temp >>> 32));
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
FeatureNode other = (FeatureNode)obj;
if (index != other.index) return false;
if (Double.doubleToLongBits(value) != Double.doubleToLongBits(other.value)) return false;
return true;
}
@Override
public String toString() {
return "FeatureNode(idx=" + index + ", value=" + value + ")";
}