docs: def parse_gene_set(gene_set_fp):
      """Parses gene set file and returns a (group)-(gene set) dictionary.
      Attribute:
          gene_set_fp (str): File path to a gene set file.
      """
      group_gene_set_dict = OrderedDict()
  
      with open(gene_set_fp) as inFile:
          for line in inFile.readlines():
              tokens = line.strip().split('\t')
              group = tokens[0]
              gene_set = set(tokens[1:])
  
              group_gene_set_dict[group] = gene_set
  
      return group_gene_set_dict