class_docstr: A tool for the finding and ranking of trigram collocations or other
  association measures. It is often useful to use from_words() rather than
  constructing an instance directly.
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docstr: Constructs a bigram collocation finder with the bigram and unigram
  data from this finder. Note that this does not include any filtering
  applied to this finder.
docstr_tok: ["Constructs","a","bigram","collocation","finder","with","the","bigram","and","unigram","data","from","this","finder",".","Note","that","this","does","not","include","any","filtering","applied","to","this","finder","."]
code: def bigram_finder(self):
      """Constructs a bigram collocation finder with the bigram and unigram
      data from this finder. Note that this does not include any filtering
      applied to this finder.
      """
      return BigramCollocationFinder(self.word_fd, self.bigram_fd)
  
imports: import itertools
  from nltk.metrics import BigramAssocMeasures, ContingencyMeasures, QuadgramAssocMeasures, TrigramAssocMeasures
  from nltk.metrics.spearman import ranks_from_scores, spearman_correlation
  from nltk.probability import FreqDist
  from nltk.util import ngrams
label_desc: Use image node_id 3 for calling the TrigramCollocationFinder obj's underlying member method code with example usage: obj.bigram_finder() and returns: BigramCollocationFinder