Jet.HMM
Class BigramHMMemitter

java.lang.Object
  Jet.HMM.HMMemitter
      Jet.HMM.BigramHMMemitter

public class BigramHMMemitter

extends HMMemitter

an HMMemitter, using statistics for exact token match (including case), for token match (ignoring case), for token bigrams (ignoring case) and for word 'shape'. Bigram information is only used for states following the first token in names (i.e., only for name-internal bigrams).

Field Summary

static boolean

useBigrams

Fields inherited from class Jet.HMM.HMMemitter

hmm, stateName

Constructor Summary

BigramHMMemitter()

Method Summary

void	computeProbabilities() computate probabilities of emission from counts.
double	getProbability(java.lang.String token, java.lang.String priorToken, FeatureSet fs) returns the probability that the current HMM state will emit token token with FeatureSet fs.
void	print() print the information about emission from this state to System.out.
void	resetForTraining() initialize the emitter prior to training.
void	setCacheCount(java.lang.String type, int n)
void	store(java.io.PrintWriter stream) write the information about emission from this state in a form which can be read by HMM.load(java.io.Reader).
void	trainOnInstances(java.lang.String token, java.lang.String priorToken, int n) update emission counts to indicate that String token appeared n times as an output of the current state.

Methods inherited from class java.lang.Object

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

Field Detail

useBigrams

public static boolean useBigrams

Constructor Detail

BigramHMMemitter

public BigramHMMemitter()

Method Detail

resetForTraining

public void resetForTraining()

Description copied from class: HMMemitter

initialize the emitter prior to training. This method should be called before any calls on HMMemitter.trainOnInstances(java.lang.String, java.lang.String, int).

Specified by:

resetForTraining in class HMMemitter

setCacheCount

public void setCacheCount(java.lang.String type,
                          int n)

Overrides:

setCacheCount in class HMMemitter

trainOnInstances

public void trainOnInstances(java.lang.String token,
                             java.lang.String priorToken,
                             int n)

Description copied from class: HMMemitter

update emission counts to indicate that String token appeared n times as an output of the current state.

Specified by:

trainOnInstances in class HMMemitter

computeProbabilities

public void computeProbabilities()

Description copied from class: HMMemitter

computate probabilities of emission from counts. This method will be called after all calls on HMMemitter.trainOnInstances(java.lang.String, java.lang.String, int) and before calls on HMMemitter.getProbability(java.lang.String, java.lang.String, Jet.Lisp.FeatureSet).

Specified by:

computeProbabilities in class HMMemitter

getProbability

public double getProbability(java.lang.String token,
                             java.lang.String priorToken,
                             FeatureSet fs)

Description copied from class: HMMemitter

returns the probability that the current HMM state will emit token token with FeatureSet fs.

Specified by:

getProbability in class HMMemitter

print

public void print()

Description copied from class: HMMemitter

print the information about emission from this state to System.out.

Specified by:

print in class HMMemitter

store

public void store(java.io.PrintWriter stream)

Description copied from class: HMMemitter

write the information about emission from this state in a form which can be read by HMM.load(java.io.Reader).

Specified by:

store in class HMMemitter