Table 1: List of the tested models with their combination of representation, context encoder, and tag decoder.

Model Name	Distributed Repr.		Context Encoder		Tage Decoder
	Token	Char2Vec	BiLSTM	Transformer	Softmax	CRF
BiLSTM	✓		✓		✓	✓
BiLSTM-CRF	✓		✓			✓
C2V-BiLSTM-CRF	✓	✓	✓			✓
Transformer	✓			✓	✓
Transformer-CRF	✓			✓		✓
Transformer-BiLSTM	✓		✓	✓	✓