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To better utilize the calculation resources from all sides, workflow offloading problems have been investigating lately. Most works focus on optimizing constraints like: latency requirements, resource utilization rate limits, and energy consumption bounds. However, the dynamics among the offloading environment have hardly been researched, which easily results in uncertain Quality of Service(QoS) on the user side. Any part of the workload change, resource availability change or network latency could incur dynamics in an offloading environment. In this work, we propose a robust PAC (probably approximately correct) offloading algorithm to address this dynamic issue together with optimization. We train an LSTM-based sequence-to-sequence neural network to learn how to offload workflows in edge-to-cloud continuum. Comprehensive implementations and corresponding comparison against state-of-the-art methods demonstrate the robustness of our proposed algorithm. 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