code: def __flip_sign_bit(x):
      return x ^ -(2**63)
  
file_path: FATE/python/fate/arch/protocol/mpc/primitives/circuit.py
imports: import functools
  import math
  import torch
label_desc: Use image node_id 4 for calling a global function with example usage: __flip_sign_bit(x) and returns: unknown