zhangfx123 / fpn.pytorch

Pytorch implementation of Feature Pyramid Network (FPN) for Object Detection

fpn.pytorch Pytorch implementation of Feature Pyramid Network (FPN) for Object Detection

Introduction

This project inherits the property of our pytorch implementation of faster r-cnn. Hence, it also has the following unique features:

• It is pure Pytorch code. We convert all the numpy implementations to pytorch.

• It supports trainig batchsize > 1. We revise all the layers, including dataloader, rpn, roi-pooling, etc., to train with multiple images at each iteration.

• It supports multiple GPUs. We use a multiple GPU wrapper (nn.DataParallel here) to make it flexible to use one or more GPUs, as a merit of the above two features.

• It supports three pooling methods. We integrate three pooling methods: roi pooing, roi align and roi crop. Besides, we convert them to support multi-image batch training.

Benchmarking

We benchmark our code thoroughly on three datasets: pascal voc, coco. Below are the results:

1). PASCAL VOC 2007 (Train/Test: 07trainval/07test, scale=600, ROI Align)

model	GPUs	Batch Size	lr	lr_decay	max_epoch	Speed/epoch	Memory/GPU	mAP
Res-101	8 TitanX	24	1e-2	10	12	0.22 hr	9688MB	74.2

Results on coco are on the way.