code: def Jn(r, n):
      return np.sqrt(np.pi / (2 * r)) * sp.jv(n + 0.5, r)
  
imports: import numpy
  from scipy.optimize import brentq
  from scipy import special
  import torch
  from math import pi
  import sympy
label_desc: Use image node_id 1 for calling a global function with example usage: Jn(r, n) and returns: unknown