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import z3
import nneq
def check_equivalence(onnx_a, onnx_b, vnnlib):
solver = nneq.Solver()
print(f"--- Checking {vnnlib} ---")
solver.load_onnx(onnx_a)
solver.load_onnx(onnx_b)
solver.load_vnnlib(vnnlib)
result = solver.check()
if result == z3.unsat:
print("VERIFIED (UNSAT): The networks are equivalent under this property.")
elif result == z3.sat:
print("FAILED (SAT): The networks are NOT equivalent.")
print("Counter-example input:")
m = solver.model()
sorted_symbols = sorted([s for s in m.decls() if s.name().startswith("X_")], key=lambda s: s.name())
for s in sorted_symbols:
print(f" {s.name()} = {m[s]}")
else:
print("UNKNOWN")
print("")
if __name__ == "__main__":
check_equivalence("./xor/xor_a.onnx", "./xor/xor_b.onnx", "./xor/xor_strict.vnnlib")
check_equivalence("./xor/xor_a.onnx", "./xor/xor_b.onnx", "./xor/xor_epsilon.vnnlib")
check_equivalence("./xor/xor_a.onnx", "./xor/xor_b.onnx", "./xor/xor_argmax.vnnlib")
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