ivory.lsh.data

Class FloatAsBytesWritable

java.lang.Object

ivory.lsh.data.FloatAsBytesWritable

All Implemented Interfaces:

Writable

public class FloatAsBytesWritable
extends Object
implements Writable

A data structure to optimize space when storing an array of floats. Floats are quantized into byte values and stored as a BytesWritable. maxNorm is a maxNormalization factor required to re-compute float from byte. byte = quantize(float) = ((float/maxNorm)*128)==128 ? 127 : ((float/maxNorm) float = dequantize(byte) = ((byte/128)*maxNorm)

Author:

ferhanture

Constructor Summary

Constructors

Constructor and Description
FloatAsBytesWritable()
FloatAsBytesWritable(byte[] bytearray, float max, float min)

Method Summary

Methods

Modifier and Type	Method and Description
byte	get(int index)
float	getAsFloat(int index)
void	readFields(DataInput in)
int	size()
void	write(DataOutput out)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FloatAsBytesWritable

public FloatAsBytesWritable()

FloatAsBytesWritable

public FloatAsBytesWritable(byte[] bytearray,
                    float max,
                    float min)

Method Detail

get

public byte get(int index)

getAsFloat

public float getAsFloat(int index)

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface Writable

Throws:

IOException

size

public int size()

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface Writable

Throws:

IOException