Method Details
Details for method 'Naive-Student (iterative semi-supervised learning with Panoptic-DeepLab)'
Method overview
| name | Naive-Student (iterative semi-supervised learning with Panoptic-DeepLab) |
| challenge | pixel-level semantic labeling |
| details | Supervised learning in large discriminative models is a mainstay for modern computer vision. Such an approach necessitates investing in large-scale human-annotated datasets for achieving state-of-the-art results. In turn, the efficacy of supervised learning may be limited by the size of the human annotated dataset. This limitation is particularly notable for image segmentation tasks, where the expense of human annotation is especially large, yet large amounts of unlabeled data may exist. In this work, we ask if we may leverage semi-supervised learning in unlabeled video sequences to improve the performance on urban scene segmentation, simultaneously tackling semantic, instance, and panoptic segmentation. The goal of this work is to avoid the construction of sophisticated, learned architectures specific to label propagation (e.g., patch matching and optical flow). Instead, we simply predict pseudo-labels for the unlabeled data and train subsequent models with both human-annotated and pseudo-labeled data. The procedure is iterated for several times. As a result, our Naive-Student model, trained with such simple yet effective iterative semi-supervised learning, attains state-of-the-art results at all three Cityscapes benchmarks, reaching the performance of 67.8% PQ, 42.6% AP, and 85.2% mIOU on the test set. We view this work as a notable step towards building a simple procedure to harness unlabeled video sequences to surpass state-of-the-art performance on core computer vision tasks. |
| publication | Semi-Supervised Learning in Video Sequences for Urban Scene Segmentation Liang-Chieh Chen, Raphael Gontijo Lopes, Bowen Cheng, Maxwell D. Collins, Ekin D. Cubuk, Barret Zoph, Hartwig Adam, Jonathon Shlens https://arxiv.org/abs/2005.10266 |
| project page / code | |
| used Cityscapes data | fine annotations, video |
| used external data | ImageNet, Mapillary Vistas Research Edition. Cityscapes train-extra set (coarse labels are not used but only images). |
| runtime | n/a |
| subsampling | no |
| submission date | April, 2020 |
| previous submissions |
Average results
| Metric | Value |
|---|---|
| IoU Classes | 85.1738 |
| iIoU Classes | 68.8238 |
| IoU Categories | 92.9195 |
| iIoU Categories | 81.9744 |
Class results
| Class | IoU | iIoU |
|---|---|---|
| road | 98.8251 | - |
| sidewalk | 88.2864 | - |
| building | 94.585 | - |
| wall | 65.2606 | - |
| fence | 69.6367 | - |
| pole | 75.2256 | - |
| traffic light | 80.9368 | - |
| traffic sign | 84.4137 | - |
| vegetation | 94.2839 | - |
| terrain | 74.451 | - |
| sky | 96.2182 | - |
| person | 89.9846 | 75.4622 |
| rider | 79.6991 | 62.1307 |
| car | 96.6685 | 88.9953 |
| truck | 82.9717 | 57.225 |
| bus | 95.5578 | 70.9907 |
| train | 93.3543 | 67.2109 |
| motorcycle | 78.3798 | 62.2471 |
| bicycle | 79.564 | 66.3282 |
Category results
| Category | IoU | iIoU |
|---|---|---|
| flat | 98.8496 | - |
| nature | 94.0671 | - |
| object | 80.2348 | - |
| sky | 96.2182 | - |
| construction | 94.848 | - |
| human | 89.8476 | 76.1456 |
| vehicle | 96.3713 | 87.8032 |