サリエンシー誘導による左側通行自動運転のためのドメイン適応
Saliency-Guided Domain Adaptation for Left-Hand Driving in Autonomous Steering
米国の右側通行データで学習したPilotNetを、反転データでの事前学習と豪州高速道路データでの微調整により左側通行環境へ適応させ、ステアリング予測精度と注意領域の変化をサリエンシー解析で評価した。
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著者: Zahra Mehraban, Sebastien Glaser, Michael Milford, Ronald Schroeter
分類: cs.CV, cs.RO
原文アブストラクト
Domain adaptation is required for automated driving models to generalize well across diverse road conditions. This paper explores a training method for domain adaptation to adapt PilotNet, an end-to-end deep learning-based model, for left-hand driving conditions using real-world Australian highway data. Four training methods were evaluated: (1) a baseline model trained on U.S. right-hand driving data, (2) a model trained on flipped U.S. data, (3) a model pretrained on U.S. data and then fine-tuned on Australian highways, and (4) a model pretrained on flipped U.S. data and then finetuned on Australian highways. This setup examines whether incorporating flipped data enhances the model adaptation by providing an initial left-hand driving alignment. The paper compares model performance regarding steering prediction accuracy and attention, using saliency-based analysis to measure attention shifts across significant road regions. Results show that pretraining on flipped data alone worsens prediction stability due to misaligned feature representations, but significantly improves adaptation when followed by fine-tuning, leading to lower prediction error and stronger focus on left-side cues. To validate this approach across different architectures, the same experiments were done on ResNet, which confirmed similar adaptation trends. These findings emphasize the importance of preprocessing techniques, such as flipped-data pretraining, followed by fine-tuning to improve model adaptation with minimal retraining requirements.
