code: def sph_harm_prefactor(l, m):
      """
      l: int
      m: int
      res: float
      Computes the constant pre-factor for the spherical harmonic of degree l and order m
      input:
      l: int, l>=0
      m: int, -l<=m<=l
      """
      return (
          (2 * l + 1)
          * np.math.factorial(l - abs(m))
          / (4 * np.pi * np.math.factorial(l + abs(m)))
      ) ** 0.5
  
file_path: dgl/examples/pytorch/dimenet/modules/basis_utils.py
imports: import numpy
  import sympy
  from scipy import special
  from scipy.optimize import brentq
label_desc: Use image node_id 5 for calling a global function with example usage: sph_harm_prefactor(l, m) and returns: unknown