Supervised training data has been scarce and, while techniques like distant supervision appear to be a promising way to extend knowledge bases at low cost, in practice the training data has often been too noisy for reliable training of relation extraction systems (Angeli et al., 2015).
most systems fail to make correct extractions even in apparently straightforward cases like Figure 1, Carey will succeed Cathleen P. Black, who held the position for 15 years and will take on a new role as chairwoman of Hearst Magazines, the company said.