Entity linking is the task of detecting mentions of entities from a knowledge base in a document.
Are there any openly available datasets to train and evaluate such systems? The datasets I came across are all closed (for instance, TAC-KBP is owned by the Linguistic Data Consortium, the YAGO-AIDA dataset requires access to the original CoNLL 2003 dataset, and so on).
The dataset should contain some text with reference annotations (for instance links to Wikipedia), and should be of reasonable size for machine learning purposes. For instance, Wikipedia dumps themselves provide this to some extent, but the wikilinks are generally not intended to be complete, so the annotations are very sparse.