Pre-ordering model (1) – MLE Baseline model: max likelihood MLE (relative frequency-based) Subtree representation: relation type and POS tag OA|NN _OC|VVPP OA|NN _OC|VVPP Prob=0.75 Prob=0.25 OA|NN _OC|VVPP Limitations: - ambiguity due to coarse word classification (only few relation/POS tags) - coverage: many unseen or low-counts subtrees
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