SRI-LM toolkit
SRI-LM toolkit
SRI-LM toolkit
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Witten-Bell Discounting<br />
• T/(N+T) gives the total “probability of unseen N-<br />
grams”, we need to divide this up among all the<br />
zero N-grams<br />
• We could just choose to divide it equally<br />
Z<br />
=<br />
i:<br />
∑<br />
c i<br />
= 0<br />
1<br />
Z is the total number of<br />
N-grams with count zero<br />
p * T<br />
= i Z(<br />
N + T<br />
)<br />
16
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