Because many annotations are uninteresting -for example, 89% of part-of-speech tags are correct at layer 0 -we use a heuristic to identify ambiguous sentences to visualize.
6 Figure 3 shows two 6 we look for target edges (s1, s2, label) where the highest scoring label has an average score τ (label|s1, s2) ≤ 0.7, and look at sentences with more than one such edge.