In contrast to the scarcity of fully annotated datasets (denoted by F as in full), there are actually some partially annotated datasets as well (denoted by P as in partial); for example, Time-Bank (Pustejovsky et al., 2003) and AQUAINT (Graff, 2002) cover in total more than 250 documents.
since annotators are not required to label all the edges in these datasets, it is less labor intensive to collect P than to collect F. existing TempRel extraction methods only work on one type of datasets (i.e., either F or P), without taking advantage of both.