Boosting Long-tailed Object Detection via Step-wise Learning on Smooth-tail Data

• URL: http://arxiv.org/abs/2305.12833v1
• Date: Mon, 22 May 2023 08:53:50 GMT
• Title: Boosting Long-tailed Object Detection via Step-wise Learning on Smooth-tail Data
• Authors: Na Dong and Yongqiang Zhang and Mingli Ding and Gim Hee Lee
• Abstract summary: We build smooth-tail data where the long-tailed distribution of categories decays smoothly to correct the bias towards head classes. We fine-tune the class-agnostic modules of the pre-trained model on the head class dominant replay data. We train a unified model on the tail class dominant replay data while transferring knowledge from the head class expert model to ensure accurate detection of all categories.
• Score: 60.64535309016623
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Real-world data tends to follow a long-tailed distribution, where the class imbalance results in dominance of the head classes during training. In this paper, we propose a frustratingly simple but effective step-wise learning framework to gradually enhance the capability of the model in detecting all categories of long-tailed datasets. Specifically, we build smooth-tail data where the long-tailed distribution of categories decays smoothly to correct the bias towards head classes. We pre-train a model on the whole long-tailed data to preserve discriminability between all categories. We then fine-tune the class-agnostic modules of the pre-trained model on the head class dominant replay data to get a head class expert model with improved decision boundaries from all categories. Finally, we train a unified model on the tail class dominant replay data while transferring knowledge from the head class expert model to ensure accurate detection of all categories. Extensive experiments on long-tailed datasets LVIS v0.5 and LVIS v1.0 demonstrate the superior performance of our method, where we can improve the AP with ResNet-50 backbone from 27.0% to 30.3% AP, and especially for the rare categories from 15.5% to 24.9% AP. Our best model using ResNet-101 backbone can achieve 30.7% AP, which suppresses all existing detectors using the same backbone.

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