Requirement falsification for cyber-physical systems using generative models
This addresses the need to detect design, software, or hardware defects in cyber-physical systems before deployment, though it appears incremental as it builds on existing falsification methods with generative models.
The paper tackles the problem of automatic requirement falsification for cyber-physical systems by introducing the OGAN algorithm, which uses generative models to find counterexamples that reveal defects before operation, and it demonstrates viability and state-of-the-art efficiency on benchmark problems.
We present the OGAN algorithm for automatic requirement falsification of cyber-physical systems. System inputs and outputs are represented as piecewise constant signals over time while requirements are expressed in signal temporal logic. OGAN can find inputs that are counterexamples for the correctness of a system revealing design, software, or hardware defects before the system is taken into operation. The OGAN algorithm works by training a generative machine learning model to produce such counterexamples. It executes tests offline and does not require any previous model of the system under test. We evaluate OGAN using the ARCH-COMP benchmark problems, and the experimental results show that generative models are a viable method for requirement falsification. OGAN can be applied to new systems with little effort, has few requirements for the system under test, and exhibits state-of-the-art CPS falsification efficiency and effectiveness.