cc.mallet.pipe
Class FeatureSequenceConvolution

java.lang.Object
  cc.mallet.pipe.Pipe
      cc.mallet.pipe.FeatureSequenceConvolution

All Implemented Interfaces:

AlphabetCarrying, java.io.Serializable

public class FeatureSequenceConvolution
extends Pipe

Author:

lmyao Convert Feature sequence

See Also:

Serialized Form

Constructor Summary

FeatureSequenceConvolution()

Method Summary

Instance

pipe(Instance carrier) construct word co-occurrence features from the original sequence do combinatoric, n choose 2, can be extended to n choose 3 public void convolution() { int fi = -1; int pre = -1; int i,j; int curLen = length; for(i = 0; i < curLen-1; i++) { for(j = i + 1; j < curLen; j++) { pre = features[i]; fi = features[j]; Object preO = dictionary.lookupObject(pre); Object curO = dictionary.lookupObject(fi); Object coO = preO.toString() + "_" + curO.toString(); add(coO); } } }

Methods inherited from class cc.mallet.pipe.Pipe

alphabetsMatch, getAlphabet, getAlphabets, getDataAlphabet, getInstanceId, getTargetAlphabet, instanceFrom, instancesFrom, instancesFrom, isDataAlphabetSet, isTargetProcessing, newIteratorFrom, preceedingPipeDataAlphabetNotification, preceedingPipeTargetAlphabetNotification, precondition, readResolve, setDataAlphabet, setOrCheckDataAlphabet, setOrCheckTargetAlphabet, setTargetAlphabet, setTargetProcessing

Methods inherited from class java.lang.Object

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

Constructor Detail

FeatureSequenceConvolution

public FeatureSequenceConvolution()

Method Detail

pipe

public Instance pipe(Instance carrier)

construct word co-occurrence features from the original sequence do combinatoric, n choose 2, can be extended to n choose 3 public void convolution() { int fi = -1; int pre = -1; int i,j; int curLen = length; for(i = 0; i < curLen-1; i++) { for(j = i + 1; j < curLen; j++) { pre = features[i]; fi = features[j]; Object preO = dictionary.lookupObject(pre); Object curO = dictionary.lookupObject(fi); Object coO = preO.toString() + "_" + curO.toString(); add(coO); } } }

Overrides:

pipe in class Pipe