code: def _log_comb(n, k) -> float:
      return (
          special.gammaln(n + 1)
          - special.gammaln(k + 1)
          - special.gammaln(n - k + 1)
      )
  
imports: import math
  from typing import Tuple, Union
  import numpy
  from scipy import special
  import six
label_desc: Use image node_id 4 for calling a global function with example usage: _log_comb(n, k) and returns: unknown