Why does the parser accept incorrect/ungrammatical sentences?
This parser is in the space of modern statistical parsers whose goal is to give the most likely sentence analysis to a list of words. It does not attempt to determine grammaticality, though it will normally prefer a “grammatical” parse for a sentence if one exists. This is appropriate in many circumstances, such as when wanting to interpret user input, or dealing with conversational speech, web pages, non-native speakers, etc. For other applications, such as grammar checking, this is less appropriate. One could attempt to assess grammaticality by looking at the probabilities that the parser returns for sentences, but it is difficult to normalize this number to give a useful “grammaticality” score, since the probability strongly depends on other factors like the length of the sentence, the rarity of the words in the sentence, and whether word dependencies in the sentence being tested were seen in the training data or not. • How much memory do I need to parse long sentences? The parser u
