code: def inverse(x):
      """Inverse 0/1 variable
  
      Args:
          x: variable with float32 dtype
  
      Returns:
          inverse_x: variable with float32 dtype
      """
      inverse_x = -1.0 * x + 1.0
      return inverse_x
  
imports: import paddle.fluid
  from paddle.fluid.executor import _fetch_var
  from parl.utils import machine_info
label_desc: Use image node_id 4 for calling a global function with example usage: inverse(x) and returns: inverse_x