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This paper evaluates the utility of Rhetorical Structure Theory (RST) trees and relations in discourse coherence evaluation. We show that incorporating silver-standard RST features can increase accuracy when classifying coherence. We demonstrate this through our tree-recursive neural model, namely RST-Recursive, which takes advantage of the text's...
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... demonstrated in Figure 5, coherence classifiers have difficulty predicting the neutral class (2), experiencing modal collapse towards the extreme ends in the best performing models. Early experiments using alternative objective functions such as the Ordinal Loss or Mean Squared Error resulted in a similar modal collapse or poor overall performance. ...
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