code: def ensemble_diffs(num, N):
      """Return num eigenvalue diffs for the NxN GOE ensemble."""
      diffs = np.empty(num)
      for i in range(num):
          mat = GOE(N)
          diffs[i] = center_eigenvalue_diff(mat)
      return diffs
  
imports: import numpy
label_desc: Use image node_id 3 for calling a global function with example usage: ensemble_diffs(num, N) and returns: diffs