Forward–backward algorithm: Difference between revisions

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m Update references to 3rd edition of Russell & Norvig, replaced address in cite tag with publication-place. Reference section still has some problems that I don't know how to fix...
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m Python example: Tagging using AWB (9510)
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<code>a_0</code> is the start probability;
<code>a</code> are the transition probabilities;
and <code>e</code> are the emission probabilities.
 
For simplicity of code, we assume that the observation sequence <code>x</code> is non-empty and that <code>a[i][j]</code> and <code>e[i][j]</code> is defined for all states i,j.