S2-GORC is a large citation graph dataset which includes full texts of 8.1 million scientific documents. We select a subset of 154K computer science articles as our corpus. From these, we extract 622K citing sentences that link back to other documents in our corpus. We hold 2500 examples for each of the validation and test sets. 
 Question: What is the size of the corpus?
8.1 million scientific documents 154K computer science articles 622K citing sentences