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  1. Chapter and Conference Paper

    NNrepair: Constraint-Based Repair of Neural Network Classifiers

    We present NNrepair, a constraint-based technique for repairing neural network classifiers. The technique aims to fix the logic of the network at an intermediate layer or at the last layer. NNrepair first uses fa...

    Muhammad Usman, Divya Gopinath, Youcheng Sun, Yannic Noller in Computer Aided Verification (2021)

  2. Chapter and Conference Paper

    Building Better Bit-Blasting for Floating-Point Problems

    An effective approach to handling the theory of floating-point is to reduce it to the theory of bit-vectors. Implementing the required encodings is complex, error prone and requires a deep understanding of flo...

    Martin Brain, Florian Schanda, Youcheng Sun in Tools and Algorithms for the Construction … (2019)

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    Chapter and Conference Paper

    Reachability Preservation Based Parameter Synthesis for Timed Automata

    The synthesis of timing parameters consists in deriving conditions on the timing constants of a concurrent system such that it meets its specification. Parametric timed automata are a powerful formalism for pa...

    Étienne André, Giuseppe Lipari, Hoang Gia Nguyen, Youcheng Sun in NASA Formal Methods (2015)