code: def get_random_gene(df, seed=0):
      """
      returns a random gene for querying
      """
      row = df.sample(False, 0.1, seed=seed).limit(1).collect()
      gene = row[0].gene
      return gene
  
label_desc: Use image node_id 2 for calling a global function with example usage: get_random_gene(df, seed) and returns: gene