tech,5-2-P99-1022,ak It proposes and evaluates new <term> cluster generation </term> , <term> hierarchical smoothing </term> and <term> adaptive topic-probability estimation techniques </term> .
other,19-4-P99-1022,ak Experiments on the <term> Broadcast News corpus </term> show significant improvement in <term> perplexity </term> ( 10.5 % overall and 33.5 % on <term> target vocabulary </term> ) .
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