Graph Explorer: group ngrams
After moving ngrams from map to candidate or stop, grouping is next issue. Let's discuss for more specifications. The main issue is: which ngrams would be chosen as the parent/root of the Tree of grouped ngrams ? A solution would be reproducing the Tree as in the ngrams table, put first a random ngrams at root (taking a policy function that would not be random: according to a specific metrics) and let the user the possibility to adapt it.