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Pixel-wise Anomaly Detection in Complex Driving Scenes

This repository is the paper implementation for Pixel-wise Anomaly Detection in Complex Driving Scenes (Link).

Installation

In order to set-up the project, please follow these steps:

1. Run git clone https://github.com/giandbt/synboost.git.
2. Download pre-trained models using wget http://robotics.ethz.ch/~asl-datasets/Dissimilarity/models.tar. De-compress file and save inside the repository (tar -xvf ./models.tar)
3. We need to install Apex (https://github.com/NVIDIA/apex) running the following:

   git clone https://github.com/NVIDIA/apex
   cd apex
   pip install -v --no-cache-dir ./
   

4. Install all the neccesary python modules with pip install -r requirements_demo.txt

Training

The anomaly pipeline uses pre-trained models for segmentation and image re-synthesis. You can find this pre-trained models using wget http://robotics.ethz.ch/~asl-datasets/Dissimilarity/models.tar. Additionally, you can refer to the original repositories.

In order to trained the dissimilarity network, we have to do the following:

1. cd image_dissimilarity
2. Modify the necessary parameters in the configuration file image_dissimilarity/configs/train/default_configuration.yaml. More importanly, modify the folder paths for each dataset to your local path. In order to get the required data for training, please refere to the Dataset section.
3. Run train.py --config configs/train/default_configuration.yaml

Evaluation

The repository already includes some sample images to test the pipeline, which are found under ./sample_images/. In order to run inference in these images, run the following command: python demo.py

In case custom images want to be tested change the --demo_folder flag. Information about all the other flags can be found running demo.py -h.

Datasets

The repository uses the Cityscapes Dataset [4] as the basis of the training data for the dissimilarity model. To download the dataset please register and follow the instructions here: https://www.cityscapes-dataset.com/downloads/.

Then, we need to pre-process the images in order to get the predicted entropy, distance, perceptual difference, synthesis, and semantic maps. The neccesary files to do all the operations can be found under data_preparation folder. In future releases, we will make one script to do all the pre-process automatically. For the time being, you can download the processed datasets used in the paper here: http://robotics.ethz.ch/~asl-datasets/Dissimilarity/data_processed.tar .

Framework Light Version

The original paper discussed the implementation of a lighter version in order to demostrate the generalization ability of the network to different synthesis and segmentation networks (even with lower performance).

In the repository, we include the code and pre-trained model used for this lighter version. However, compatiblity with demo.py is still not supported.

Google Colab Demo Notebook

A demo of the anomaly detection pipeline can be found here: https://colab.research.google.com/drive/1HQheunEWYHvOJhQQiWbQ9oHXCNi9Frfl?usp=sharing#scrollTo=gC-ViJmm23eM

ONNX Conversion

In order to convert all three models into .onnx, it is neccesary to update the symbolic_opset11.py file from the original torch module installation. The reason for this is that torch==1.4.0 does not have compatibility for im2col which is neccesary for the synthesis model.

Simply copy the symbolic_opset11.py from this repository and replace the one from the torch module inside your project environment. The file is located /Path/To/Enviroment/lib/python3.7/site-packages/torch/onnx

Notes

• The image segmentaion folder is heavily based on [1], specifically commit b4fc685. Additionally, the image synthesis folder is based on [2]. specifically commit 0486b08. For light weight version of the segmentation model, we used the code from [3] (commit 682e0e6) as our segmentation model, and [4] as our synthesis model (commit 5a2c872)
• The branch fishyscapes_package includes the code as a package specifically made for Fishyscapes submission. In ther to get the class for the detector simply from test_fishy_torch import AnomalyDetector.

References

[1] Learning to Predict Layout-to-image Conditional Convolutions for Semantic Image Synthesis. Xihui Liu, Guojun Yin, Jing Shao, Xiaogang Wang and Hongsheng Li.

[2] Improving Semantic Segmentation via Video Propagation and Label Relaxation Yi Zhu1, Karan Sapra, Fitsum A. Reda, Kevin J. Shih, Shawn Newsam, Andrew Tao, Bryan Catanzaro.

[3] https://github.com/lxtGH/Fast_Seg

[4] High-resolution image synthesis and semantic manipulation with conditional gans. Ting-Chun Wang, Ming-Yu Liu, Jun-Yan Zhu, Andrew Tao, Jan Kautz, and Bryan Catanzaro.

[5] The cityscapes dataset for semantic urban scene understanding. Marius Cordts, Mohamed Omran, Sebastian Ramos, Timo Rehfeld, Markus Enzweiler, Rodrigo Benenson, Uwe Franke, Stefan Roth, and Bernt Schiele