Lane2Seq: Towards Unified Lane Detection via Sequence Generation

In this paper we present a novel sequence generation-based framework for lane detection called Lane2Seq. It unifies various lane detection formats by casting lane detection as a sequence generation task. This is different from previous lane detection methods which depend on well-designed task-specific head networks and corresponding loss functions. Lane2Seq only adopts a plain transformer-based encoder-decoder architecture with a simple cross-entropy loss. Additionally we propose a new multi-format model tuning based on reinforcement learning to incorporate the task-specific knowledge into Lane2Seq. Experimental results demonstrate that such a simple sequence generation paradigm not only unifies lane detection but also achieves competitive performance on benchmarks. For example Lane2Seq gets 97.95% and 97.42% F1 score on Tusimple and LLAMAS datasets establishing a new state-of-the-art result for two benchmarks.