論文速覽：Multi-source Domain Adaptation for Semantic Segmentation
Multi-source Domain Adaptation for Semantic Segmentation
[NeurIPS 2019] [2020: MADAN: Multi-source Adversarial Domain Aggregation Network for Domain Adaptation] [github]
目錄
Multi-source Domain Adaptation for Semantic Segmentation
Dynamic Adversarial Image Generation
Adversarial Domain Aggregation
Feature-aligned Semantic Segmentation
Abstract
Simulation-to-real domain adaptation for semantic segmentation has been actively studied for various applications such as autonomous driving. Existing methods mainly focus on a single-source setting, which cannot easily handle a more practical scenario of multiple sources with different distributions. In this paper, we propose to investigate multi-source domain adaptation for semantic segmentation. Specifically, we design a novel framework, termed Multi-source Adversarial Domain Aggregation Network (MADAN), which can be trained in an end-to-end manner. First, we generate an adapted domain for each source with dynamic semantic consistency while aligning at the pixel-level cycle-consistently towards the target. Second, we propose sub-domain aggregation discriminator and cross-domain cycle discriminator to make different adapted domains more closely aggregated. Finally, feature-level alignment is performed between the aggregated domain and target domain while training the segmentation network. Extensive experiments from synthetic GTA and SYNTHIA to real Cityscapes and BDDS datasets demonstrate that the proposed MADAN model outperforms state-of-the-art approaches.
第一句，研究意義：在自動駕駛等多種應用中，針對語義分割的模擬-真實域適應問題進行了研究。
第二句，提出問題：現有的方法主要集中在單一源域設定上，這很難處理具有不同分佈的、多個源的、更實際的場景。
第三句，本文工作：一句話概括本文做的內容，即 提出研究語義分割的多源域適應問題。
第四-七句，具體方法：本文提出的模型，Multi-source Adversarial Domain Aggregation Network (MADAN)，包括三個部分：
First，為每個源生成一個具有動態語義一致性的自適應域，同時在畫素級迴圈上對齊目標；
Second，出了子域聚集判別器和跨域迴圈判別器，以使不同的適應域更緊密地聚集在一起；
Finally，在訓練分割網路的同時，對聚集的域和目標域進行特徵級對齊。
第八句，實驗結論：從合成的資料集 GTA 和 SYNTHIA 到真實的資料集 Cityscapes 和 BDDS 上的廣泛實驗表明，所提出的 MADAN 模型優於最先進的方法。
Problem Setup
MADAN
Overview
Figure 1: The framework of the proposed Multi-source Adversarial Domain Aggregation Network (MADAN). The colored solid arrows represent generators, while the black solid arrows indicate the segmentation network F. The dashed arrows correspond to different losses.
Dynamic Adversarial Image Generation
Adversarial Domain Aggregation
Feature-aligned Semantic Segmentation
MADAN Learning
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