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Diffstat (limited to 'report/pr-clustering/posterior.tex')
| -rw-r--r-- | report/pr-clustering/posterior.tex | 31 |
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diff --git a/report/pr-clustering/posterior.tex b/report/pr-clustering/posterior.tex index 73c15dba..7597c8e1 100644 --- a/report/pr-clustering/posterior.tex +++ b/report/pr-clustering/posterior.tex @@ -191,3 +191,34 @@ where $\mathcal{L}_1$ and $\mathcal{L}_2$ are log-likelihood of two models. \section{Experiments} +As a sanity check, we looked at a few examples produced by +the basic model (EM) +and the posterior regularization (PR) model +with sparsity constraints. Table \ref{tab:EMVSPR} +shows a few examples. + +\begin{table}[h] + \centering + \includegraphics[width=3.5in]{pr-clustering/EMVSPR} + \caption[A few examples comparing EM and PR] + {A few examples comparing EM and PR. + Count of most frequent category shows how + many instances of a phrase are concetrated on + the single most frequent tag. + Number of categories shows how many categories + a phrase is labelled with. By experience as mentioned before, + we want a phrase to use fewer categories. + These numbers are fair indicators of sparsity. + } + \label{tab:EMVSPR} +\end{table} + +The models are formally evaluated with two kinds +of metrics. We feed the clustering output +through the whole translation pipeline +to obtain a BLEU score. We also came up +with an intrinsic evaluation of clustering quality +by comparing against a supervised CFG parser trained on the +tree bank. + + |