class_docstr: Incremental version of https://en.wikipedia.org/wiki/Kahan_summation_algorithm
code: def __float__(self):
      return sum(self.partials, 0.0)
  
file_path: vowpal_wabbit/python/tests/confidence_sequence.py
imports: from cmath import sqrt
label_desc: Use image node_id 4 for calling the incremental_f_sum obj's underlying member method code with example usage: obj.__float__() and returns: sum