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Getting Started with openseg.pytorch

This document provides a brief intro of the usage of openseg.pytorch.

You can also refer to the openseg-group#14 for the guidelines on how to train the models on your own dataset based openseg.pytorch.

Requirements

  • Linux or macOS with Python ≥ 3.6
  • PyTorch == 0.4.1
  • torchvision that matches the PyTorch installation. You can install them together at pytorch.org to make sure of this.

You may use pip install -r requirements.txt to install the dependencies.

Configuration

Before executing any scripts, your should first fill up the config file config.profile at project root directory. There are two items you should specify:

  • PYTHON, identifying your python executable.
  • DATA_ROOT, the root directory of your data. It should be the parent directory of cityscapes.

Data Preparation

You need to download Cityscapes, LIP, PASCAL-Context or COCO-Stuff 10k v1.1 datasets.

We arrange images and labels in another way. You could preprocess the files by running:

python lib/datasets/preprocess/cityscapes/cityscapes_generator.py --coarse True \
  --save_dir <path/to/preprocessed_cityscapes> --ori_root_dir <path/to/original_cityscapes>
python lib/datasets/preprocess/pascal_context/pascal_context_generator.py \
  --save_dir <path/to/preprocessed_context> --ori_root_dir <path/to/original_context>
python lib/datasets/preprocess/coco_stuff/coco_stuff_generator.py \
  --save_dir <path/to/preprocessed_cocostuff> --ori_root_dir <path/to/original_cocostuff>

and finally, the dataset directory should look like:

$DATA_ROOT
├── cityscapes
│   ├── coarse
│   │   ├── image
│   │   ├── instance
│   │   └── label
│   ├── train
│   │   ├── image
│   │   └── label
│   ├── val
│   │   ├── image
│   │   └── label
├── pascal_context
│   ├── train
│   │   ├── image
│   │   └── label
│   ├── val
│   │   ├── image
│   │   └── label
├── lip
│   ├── atr
│   │   ├── edge
│   │   ├── image
│   │   └── label
│   ├── cihp
│   │   ├── image
│   │   └── label
│   ├── train
│   │   ├── edge
│   │   ├── image
│   │   └── label
│   ├── val
│   │   ├── edge
│   │   ├── image
│   │   └── label
├── coco_stuff_10k
│   ├── train
│   │   ├── image
│   │   └── label
│   ├── val
│   │   ├── image
│   │   └── label

Inference with Pre-trained Models

Take HRNet-W48 + OCR on Cityscapes as an example.

First you should refer to MODEL_ZOO.md to download its pre-trained weights hrnet_w48_ocr_1_latest.pth, and put it to $PROJECT_ROOT/checkpoints/cityscapes/. Then execute bash scripts/cityscapes/hrnet/run_h_48_d_4_ocr.sh val 1 to perform the inference.

Here 1 is the id of experiments, and should match the id in the name hrnet_w48_ocr_1_latest.pth, which may be modified accordingly for other scripts.

After inference, you can retrieve the tested labelmaps and visualization at $DATA_ROOT/cityscapes/hrnet_w48_ocr_1_latest_val/.

Training Models in openseg

First you should download ImageNet pre-trained weights from here, and put them under $PROJECT_ROOT/pretrained_model/. Then run bash <script> train <name> to start training, where <script> is path to the corresponding training script, and <name> is arbitary string to help you identify the experiments.

For example, to train HRNet-W48 + OCR on Cityscapes, you may run bash scripts/cityscapes/hrnet/run_h_48_d_4_ocr.sh train 1.

You can find path of all the scripts in MODEL_ZOO.md.