tive cost to the j-th tag at i-th token</span>
<a name="l00276"></a>00276   <span class="comment">// used in viterbi search</span>
<a name="l00277"></a>00277   <span class="keyword">virtual</span> <span class="keywordtype">double</span> best_cost(<span class="keywordtype">size_t</span> i, <span class="keywordtype">size_t</span> j) <span class="keyword">const</span> = 0;
<a name="l00278"></a>00278 
<a name="l00279"></a>00279 <span class="preprocessor">#ifndef SWIG</span>
<a name="l00280"></a>00280 <span clas