parameters: (x, y, out, dout)
return_statement: return dout, -dout
docstring: Backpropagator for primitive `scalar_sub`.
docstring_summary: Backpropagator for primitive `scalar_sub`.
docstring_tokens: Backpropagator for primitive scalar_sub .
function: def bprop_scalar_sub(x, y, out, dout):
      """Backpropagator for primitive `scalar_sub`."""
      return dout, -dout
function_tokens: def bprop_scalar_sub ( x , y , out , dout ) : return dout , - dout