code: def _compare_vector(arr1, arr2, rel_tol):
      
  
      length = len(arr1)
      if len(arr2) != length:
          return False
  
      for i in range(length):
          element_1 = float(arr1[i])
          element_2 = float(arr2[i])
  
          diff = abs(abs(element_1) - abs(element_2))
          if diff != 0.0:
              rel = _reldiff(element_1, element_2)
  
              # For a basis set, a relatively coarse comparison
              # should be acceptible
              if rel > rel_tol:
                  return False
  
      return True
docs: Compares two vectors (python lists) for approximate equality.
  
      Each array contains floats or strings convertible to floats
  
      This function returns True if both arrays are of the same length
      and each value is within the given relative tolerance.