Transforms -LRB-, -LCB-, etc. tokens back into "(", "{", etc.
This is necessary because the POS WSJ dataset uses the -LRB- conventions to replace words in the dataset,
whereas all the others datasets we use (NER, syntax) do not.
Note that we continue to keep the *POS tags* as -LRB-, -LCB-, etc., because these are standard Penn Treebank tags.
We just replace the words.
Transforms -LRB-, -LCB-, etc. tokens back into "(", "{", etc. This is necessary because the POS WSJ dataset uses the -LRB- conventions to replace words in the dataset, whereas all the others datasets we use (NER, syntax) do not. Note that we continue to keep the *POS tags* as -LRB-, -LCB-, etc., because these are standard Penn Treebank tags. We just replace the words.