code: def LEcuyer(s1=100001, s2=200002):
      """Return a LEcuyer random number generator.
  
      Generate uniformly distributed random numbers using the 32-bit
      generator from figure 3 of:
  
          L'Ecuyer, P. Efficient and portable combined random number
          generators, C.A.C.M., vol. 31, 742-749 & 774-?, June 1988.
  
      The cycle length is claimed to be 2.30584E+18
  
      Parameters
      ----------
      s1: int
          First seed value. Should not be null. (default 100001)
      s2: int
          Second seed value. Should not be null. (default 200002)
  
      Returns
      -------
      r_number : float
          pseudo-random number uniformly distributed between [0-1]
  
      Examples
      --------
      >>> from dipy.core import rng
      >>> N = 1000
      >>> a = [rng.LEcuyer() for i in range(N)]
  
      """
      if not s1 or not s2:
          raise ValueError("A seed value can not be null.")
      k = s1 / 53668
      s1 = 40014 * (s1 - k * 53668) - k * 12211
      if s1 < 0:
          s1 = s1 + 2147483563
      k = s2 / 52774
      s2 = 40692 * (s2 - k * 52774) - k * 3791
      if s2 < 0:
          s2 = s2 + 2147483399
      z = s1 - s2
      if z < 0:
          z = z + 2147483562
  
      return z / 2147483563.0
  
imports: from math import floor
  from platform import architecture
  import numpy
label_desc: Use image node_id 3 for calling a global function with example usage: LEcuyer(s1, s2) and returns: unknown