deeplabv3

PyTorch implementation of DeepLabV3, trained on the Cityscapes dataset.

• Youtube video of results:

Index

• Using a VM on Paperspace
• Pretrained model
• Training a model on Cityscapes
• Evaluation
• Visualization
• Documentation of remaining code

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Paperspace:

To train models and to run pretrained models (with small batch sizes), you can use an Ubuntu 16.04 P4000 VM with 250 GB SSD on Paperspace. Below I have listed what I needed to do in order to get started, and some things I found useful.

• Install docker-ce:

• • $ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
• • $ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
• • $ sudo apt-get update
• • $ sudo apt-get install -y docker-ce

• Install CUDA drivers:

• • $ CUDA_REPO_PKG=cuda-repo-ubuntu1604_9.1.85-1_amd64.deb
• • $ wget -O /tmp/${CUDA_REPO_PKG} http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/${CUDA_REPO_PKG}
• • $ sudo dpkg -i /tmp/${CUDA_REPO_PKG}
• • $ sudo apt-key adv --fetch-keys http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/7fa2af80.pub
• • $ rm -f /tmp/${CUDA_REPO_PKG}
• • $ sudo apt-get update
• • $ sudo apt-get install cuda-drivers
• • Reboot the VM.

• Install nvidia-docker:

• • $ wget -P /tmp https://github.com/NVIDIA/nvidia-docker/releases/download/v1.0.1/nvidia-docker_1.0.1-1_amd64.deb
• • $ sudo dpkg -i /tmp/nvidia-docker*.deb && rm /tmp/nvidia-docker*.deb
• • $ sudo nvidia-docker run --rm nvidia/cuda nvidia-smi

• Download the PyTorch 0.4 docker image:

• • $ sudo docker pull pytorch/pytorch:0.4_cuda9_cudnn7

• Create start_docker_image.sh containing:

#!/bin/bash

# DEFAULT VALUES
GPUIDS="0"
NAME="paperspace_GPU"


NV_GPU="$GPUIDS" nvidia-docker run -it --rm \
        -p 5584:5584 \
        --name "$NAME""$GPUIDS" \
        -v /home/paperspace:/root/ \
        pytorch/pytorch:0.4_cuda9_cudnn7 bash

• Inside the image, /root/ will now be mapped to /home/paperspace (i.e., $ cd -- takes you to the regular home folder).

• To start the image:

• • $ sudo sh start_docker_image.sh

• To commit changes to the image:

• • Open a new terminal window.
• • $ sudo docker commit paperspace_GPU0 pytorch/pytorch:0.4_cuda9_cudnn7

• To stop the image when it’s running:

• • $ sudo docker stop paperspace_GPU0

• To exit the image without killing running code:

• • Ctrl + P + Q

• To get back into a running image:

• • $ sudo docker attach paperspace_GPU0

• To open more than one terminal window at the same time:

• • $ sudo docker exec -it paperspace_GPU0 bash

• To install the needed software inside the docker image:

• • $ apt-get update
• • $ apt-get install nano
• • $ apt-get install sudo
• • $ apt-get install wget
• • $ sudo apt install unzip
• • $ sudo apt-get install libopencv-dev
• • $ pip install opencv-python
• • $ python -mpip install matplotlib
• • Commit changes to the image (otherwise, the installed packages will be removed at exit!)

• Do the following outside of the docker image:

• • $ --
• • $ git clone https://github.com/fregu856/deeplabv3.git
• • Download the Cityscapes dataset:
• • • Register on the website.
• • • $ wget --keep-session-cookies --save-cookies=cookies.txt --post-data 'username=XXXXX&password=YYYYY&submit=Login' https://www.cityscapes-dataset.com/login/ (where you replace XXXXX with your username, and YYYYY with your password)
• • • $ wget --load-cookies cookies.txt --content-disposition https://www.cityscapes-dataset.com/file-handling/?packageID=1
• • • $ wget --load-cookies cookies.txt --content-disposition https://www.cityscapes-dataset.com/file-handling/?packageID=3
• • • $ unzip gtFine_trainvaltest.zip
• • • $ unzip leftImg8bit_trainvaltest.zip
• • • $ mkdir deeplabv3/data
• • • $ mkdir deeplabv3/data/cityscapes
• • • $ mv gtFine deeplabv3/data/cityscapes
• • • $ mv leftImg8bit deeplabv3/data/cityscapes
• • • $ wget --load-cookies cookies.txt --content-disposition https://www.cityscapes-dataset.com/file-handling/?packageID=12
• • • $ unzip leftImg8bit_demoVideo.zip
• • • $ mv leftImg8bit/demoVideo deeplabv3/data/cityscapes/leftImg8bit
• • • $ wget https://www.dropbox.com/s/vt1d0pjjphwivvc/thn.zip?dl=0 (to download the OPTIONAL Thn sequence data (standard dash cam))
• • • $ unzip thn.zip?dl=0
• • • $ mv thn deeplabv3/data
• • • $ cd deeplabv3
• • • $ git clone https://github.com/mcordts/cityscapesScripts.git
• • • Comment out the line print type(obj).name on line 238 in deeplabv3/cityscapesScripts/cityscapesscripts/helpers/annotation.py (this is need for the cityscapes scripts to be runnable with Python3)

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Pretrained model:

• pretrained_models/model_13_2_2_2_epoch_580.pth:
• • Trained for 580 epochs on Cityscapes train and 3333 + 745 images from Berkeley DeepDrive.

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Train model on Cityscapes:

• SSH into the paperspace server.
• $ sudo sh start_docker_image.sh
• $ cd --
• $ python deeplabv3/utils/preprocess_data.py (ONLY NEED TO DO THIS ONCE!)
• $ python deeplabv3/train.py

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Evaluation

evaluation/eval_on_val.py:

• SSH into the paperspace server.

• $ sudo sh start_docker_image.sh

• $ cd --

• $ python deeplabv3/utils/preprocess_data.py (ONLY NEED TO DO THIS ONCE!)

• $ python deeplabv3/evaluation/eval_on_val.py

• • This will run the pretrained model (set on line 31 in eval_on_val.py) on all images in Cityscapes val, compute and print the loss, and save the predicted segmentation images in deeplabv3/training_logs/model_eval_val.

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evaluation/eval_on_val_for_metrics.py:

• SSH into the paperspace server.

• $ sudo sh start_docker_image.sh

• $ cd --

• $ python deeplabv3/utils/preprocess_data.py (ONLY NEED TO DO THIS ONCE!)

• $ python deeplabv3/evaluation/eval_on_val_for_metrics.py

• $ cd deeplabv3/cityscapesScripts

• $ pip install . (ONLY NEED TO DO THIS ONCE!)

• $ python setup.py build_ext --inplace (ONLY NEED TO DO THIS ONCE!) (this enables cython, which makes the cityscapes evaluation script run A LOT faster)

• $ export CITYSCAPES_RESULTS="/root/deeplabv3/training_logs/model_eval_val_for_metrics"

• $ export CITYSCAPES_DATASET="/root/deeplabv3/data/cityscapes"

• $ python cityscapesscripts/evaluation/evalPixelLevelSemanticLabeling.py

• • This will run the pretrained model (set on line 55 in eval_on_val_for_metrics.py) on all images in Cityscapes val, upsample the predicted segmentation images to the original Cityscapes image size (1024, 2048), and compute and print performance metrics:

classes          IoU      nIoU
--------------------------------
road          : 0.918      nan
sidewalk      : 0.715      nan
building      : 0.837      nan
wall          : 0.413      nan
fence         : 0.397      nan
pole          : 0.404      nan
traffic light : 0.411      nan
traffic sign  : 0.577      nan
vegetation    : 0.857      nan
terrain       : 0.489      nan
sky           : 0.850      nan
person        : 0.637    0.491
rider         : 0.456    0.262
car           : 0.897    0.759
truck         : 0.582    0.277
bus           : 0.616    0.411
train         : 0.310    0.133
motorcycle    : 0.322    0.170
bicycle       : 0.583    0.413
--------------------------------
Score Average : 0.593    0.364
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categories       IoU      nIoU
--------------------------------
flat          : 0.932      nan
construction  : 0.846      nan
object        : 0.478      nan
nature        : 0.869      nan
sky           : 0.850      nan
human         : 0.658    0.521
vehicle       : 0.871    0.744
--------------------------------
Score Average : 0.786    0.632
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Visualization

visualization/run_on_seq.py:

• SSH into the paperspace server.

• $ sudo sh start_docker_image.sh

• $ cd --

• $ python deeplabv3/utils/preprocess_data.py (ONLY NEED TO DO THIS ONCE!)

• $ python deeplabv3/visualization/run_on_seq.py

• • This will run the pretrained model (set on line 33 in run_on_seq.py) on all images in the Cityscapes demo sequences (stuttgart_00, stuttgart_01 and stuttgart_02) and create a visualization video for each sequence, which is saved to deeplabv3/training_logs/model_eval_seq. See Youtube video from the top of the page.

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visualization/run_on_thn_seq.py:

• SSH into the paperspace server.

• $ sudo sh start_docker_image.sh

• $ cd --

• $ python deeplabv3/utils/preprocess_data.py (ONLY NEED TO DO THIS ONCE!)

• $ python deeplabv3/visualization/run_on_thn_seq.py

• • This will run the pretrained model (set on line 31 in run_on_thn_seq.py) on all images in the Thn sequence (real-life sequence collected with a standard dash cam) and create a visualization video, which is saved to deeplabv3/training_logs/model_eval_seq_thn. See Youtube video from the top of the page.

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Documentation of remaining code

• model/resnet.py:

• • Definition of the custom Resnet model (output stride = 8 or 16) which is the backbone of DeepLabV3.

• model/aspp.py:

• • Definition of the Atrous Spatial Pyramid Pooling (ASPP) module.

• model/deeplabv3.py:

• • Definition of the complete DeepLabV3 model.

• utils/preprocess_data.py:

• • Converts all Cityscapes label images from having Id to having trainId pixel values, and saves these to deeplabv3/data/cityscapes/meta/label_imgs. Also computes class weights according to the ENet paper and saves these to deeplabv3/data/cityscapes/meta.

• utils/utils.py:

• • Contains helper funtions which are imported and utilized in multiple files.

• datasets.py:

• • Contains all utilized dataset definitions.