code: def russellrao(u, v):
      """Compute the Russell-Rao distance between two 1-D arrays.
  
      The Russell-Rao distance is defined as the proportion of elements
      in both `u` and `v` that are in the exact same position:
  
      .. math::
          d(u, v) = \\frac{1}{n} \\sum_{k=0}^n u_i = v_i
  
      where :math:`x = y` is one if :math:`x` is different from :math:`y`
      and zero otherwise.
  
      Args:
          u (array_like): Input array of size (N,)
          v (array_like): Input array of size (N,)
  
      Returns:
          hamming (double): The Hamming distance between vectors `u` and `v`.
      """
      if not pylibraft_available:
          raise RuntimeError("pylibraft is not installed")
      u = cupy.asarray(u)
      v = cupy.asarray(v)
      output_arr = cupy.zeros((1,), dtype=u.dtype)
      pairwise_distance(u, v, output_arr, "russellrao")
  
      return output_arr[0]
  
imports: import cupy
label_desc: Use image node_id 12 for calling a global function with example usage: russellrao(u, v) and returns: output_arr