Question: What are the black-box probes used?
Answer: CCG Supertagging CCGBank , PTB part-of-speech tagging, EWT part-of-speech tagging,
Chunking, Named Entity Recognition, Semantic Tagging, Grammar Error Detection, Preposition Supersense Role, Preposition Supersense Function, Event Factuality Detection
Alternative answer: Probes are linear models trained on frozen cwrs to make predictions about linguistic (syntactic and semantic) properties of words and phrases.