However, we observe that the lower left corner formed by the classes Family, Characteristics and Biographical Sketch is almost symmetric in its confusions, which led us to inspect and classify the types of errors.
we investigated all errors manually and classified them in three main types of errors: errors due to Ambiguity (39%), errors due to wrong Annotation (18%) and errors tagged as Other (42%) where the errors are more difficult to explain (see last column in Table 6).