The following handcrafted features were used for the model:

Bias feature

Token feature

Uppercase feature (y/n)

Titlecase feature (y/n)

Character trigram feature

Quotation feature (y/n)

Word suffix feature (last three characters)

POS tag (provided by spaCy utilities)

Word shape (provided by spaCy utilities)

Word embedding (see Table TABREF26) 
 Question: What are the handcrafted features used?
Bias feature Token feature Uppercase feature (y/n) Titlecase feature (y/n) Character trigram feature Quotation feature (y/n) Word suffix feature (last three characters) POS tag (provided by spaCy utilities) Word shape (provided by spaCy utilities) Word embedding (see Table TABREF26)