Alignment between all induced non-terminals (x-axis) and gold non-terminals annotated in the PTB (y-axis). In the upper figure, we show the seven most frequent gold non-terminals, and list them by frequency from left to right. For each gold non-terminal, we show the proportion of each induced non-terminal. In the lower map, we breakdown the results of the noun phrase (NP) into subcategories. Darker color indicates higher proportion, and vice versa.