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## 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`

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