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GETTING_STARTED.md

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Getting Started with MaskFormer

This document provides a brief intro of the usage of MaskFormer.

Please see Getting Started with Detectron2 for full usage.

Inference Demo with Pre-trained Models

  1. Pick a model and its config file from model zoo, for example, ade20k-150/semask_swin/maskformer_semask_swin_large_IN21k_384_bs16_160k_res640.yaml.
  2. We provide demo.py that is able to demo builtin configs. Run it with:
cd demo/
python demo.py --config-file ../configs/ade20k-150/semask_swin/maskformer_semask_swin_large_IN21k_384_bs16_160k_res640.yaml \
  --input input1.jpg input2.jpg \
  [--other-options]
  --opts MODEL.WEIGHTS /path/to/checkpoint_file

The configs are made for training, therefore we need to specify MODEL.WEIGHTS to a model from model zoo for evaluation. This command will run the inference and show visualizations in an OpenCV window.

For details of the command line arguments, see demo.py -h or look at its source code to understand its behavior. Some common arguments are:

  • To run on your webcam, replace --input files with --webcam.
  • To run on a video, replace --input files with --video-input video.mp4.
  • To run on cpu, add MODEL.DEVICE cpu after --opts.
  • To save outputs to a directory (for images) or a file (for webcam or video), use --output.

Training & Evaluation in Command Line

We provide two scripts in train_net.py, that are made to train all the configs provided in MaskFormer.

To train a model with "train_net.py", first setup the corresponding datasets following datasets/README.md, then run:

./train_net.py --num-gpus 8 \
  --config-file configs/ade20k-150/semask_swin/maskformer_semask_swin_large_IN21k_384_bs16_160k_res640.yaml

The configs are made for 8-GPU training. Since we use ADAMW optimizer, it is not clear how to scale learning rate with batch size. To train on 1 GPU, you need to figure out learning rate and batch size by yourself:

./train_net.py \
  --config-file configs/ade20k-150/semask_swin/maskformer_semask_swin_large_IN21k_384_bs16_160k_res640.yaml \
  --num-gpus 1 SOLVER.IMS_PER_BATCH SET_TO_SOME_REASONABLE_VALUE SOLVER.BASE_LR SET_TO_SOME_REASONABLE_VALUE

To evaluate a model's performance, use

./train_net.py \
  --config-file configs/ade20k-150/semask_swin/maskformer_semask_swin_large_IN21k_384_bs16_160k_res640.yaml \
  --eval-only MODEL.WEIGHTS /path/to/checkpoint_file

For more options, see ./train_net.py -h.