According to the paper linked by the original announcement [1], the parser scores 94.41% for unlabeled attachment on the Wall Street Journal corpus [2], a parse

According to the paper linked by the original announcement [1], the parser scores 94.41% for unlabeled attachment on the Wall Street Journal corpus [2], a parsed and labeled data set of 30 million words. This corpus is a standard for NLP research on english syntax, but I think its worth remembering there is a great deal of disagreement among linguists about what the syntax of english is and what the lexical categories are. [1] http://googleresearch.blogspot.com/2016/05/announcing-syntaxnet-worlds-most.html?m=1 http://googleresearch.blogspot.com/2016/05/announcing-syntax... [2] https://catalog.ldc.upenn.edu/LDC2000T43 https://catalog.ldc.upenn.edu/LDC2000T43