docstr: Add a quantity
  
  :param rank_smoothing_constant: float
  :return: self
docstr_tok: ["Add","a","quantity",":","param","rank_smoothing_constant",":","float",":","return",":","self"]
code: def set_rank_smoothing_constant(self, rank_smoothing_constant):
      """
      Add a quantity
  
      :param rank_smoothing_constant: float
      :return: self
      """
      self._rank_smoothing_constant = rank_smoothing_constant
      return self
  
file_path: scattertext/scattertext/features/PyTextRankPhrases.py
imports: from collections import Counter
  from scattertext.features.FeatsFromSpacyDoc import FeatsFromSpacyDoc
label_desc: Use image node_id 3 for calling the PyTextRankPhrases obj's underlying member method code with example usage: obj.set_rank_smoothing_constant(rank_smoothing_constant) and returns: self