class_docstr: Wilcoxon Rank Sum (inspired by https://github.com/Zeta-and-Company/pydistinto/blob/main/scripts/measures/wilcoxon_ranksum.py)
  Pseudo counts of 0.0001 are added to each document.
code: def get_name(self):
      return "Man-Whitney U"
  
file_path: scattertext/scattertext/termscoring/rank_sum.py
imports: import pandas
  from scipy.stats import norm, mannwhitneyu
  from scattertext.termscoring.CorpusBasedTermScorer import CorpusBasedTermScorer
label_desc: Use image node_id 4 for calling the RankSum obj's underlying member method code with example usage: obj.get_name() and returns: str