Natural Language Processing (Almost) from Scratch

3.3.3 Tagging Schemes

1. Which tagging scheme did Collobert et al. use for segment tasks, and what are its tags?
   IOBES for all tasks, the most expressive: B-X begins a segment, I-X is inside, E-X ends it, S-X is a single-word segment, O is outside. For chunking, a one-word NP is S-NP; longer NPs are B-NP … I-NP … E-NP. Output was converted back to IOB for evaluation.
   • Collobert et al., 2011, Natural Language Processing (Almost) from Scratch (Journal of Machine Learning Research), §3.3.3, p. 2505