Violence Detection by CNN + LSTM

The proposed approach outperforms the state-of-the-art methods, while still processing the videos in real-time. The proposed model has the following advantages:

1. The ability to use the pre-trained model on ImageNet dataset.
2. The ability to learn the local motion features by examined the concatenated two frames using CNN.
3. The ability to learn the global temporal features by LSTM cell. For more information, please refer to this article.

Requirement

Python3

sk-video

scikit-image

TensorFlow 1.7.0

imgaug (This pakage has already contained in src/third_party)

Quick Start

Training

1. Download the fight/non-fight dataset from here or, other fight/non-fight datasets is also supported as long as you separate the fight and non-fight videos in the different directories.

2. To make the data catelogs that will tell the data manager where to load the videos, edit the file: tools/Train_Val_Test_spliter.py to specified the path to the dataset videos, the ratio to split the datasets into training, validation and test set. And run such scripts, you will get three data catelogs: train.txt, val.txt, test.txt.

3. Edit the settings/DataSettings.py to specify where do you put the data catelogs:

	PATH_TO_TRAIN_SET_CATELOG = 'MyPathToDataCatelog/train.txt'
	PATH_TO_VAL_SET_CATELOG = 'MyPathToDataCatelog/val.txt'
	PATH_TO_TEST_SET_CATELOG = 'MyPathToDataCatelog/test.txt'

4. Edit the settings/TrainSettings.py, and set the variables to fit your environment. For example, you may want to edit the following variables:

	MAX_TRAINING_EPOCH = 30

	EPOCHS_TO_START_SAVE_MODEL = 1
	PATH_TO_SAVE_MODEL = "MyPathToSaveTrainingResultsAndModels"

5. By default, it will use the G2D19_P2OF_ResHB_1LSTM as its default network. This network is base on the pre-trained Darknet19. The checkpoint of such model is converted from the Darknet format to the TensorFlow pb format by the use of Darkflow. You can convert the checkpoint by yourself, or download from here.

   Then, move the file to 'data/pretrainModels/darknet19/', or edit the variable DARKNET19_MODEL_PATH in src/net/G2D19_P2OF_ResHB_1LSTM.py to the path that you put the checkpoint.

Note: You can change the network by editting the settings/NetSettings.py. Take a look at src/net to see the various networks that are avaliable.

6. You're ready to train the model. Type the following command to train:

	python3 Train.py

or, if you set the Train.py to be executable, just type:

	./Train.py

Deploy

After you have trained a model, you can input a video and see its performance by following procedures:

1. Edit the settings/DeploySettings.py to set the variables to fit your environment. For example, you may want to edit the following variables:

	PATH_TO_MODEL_CHECKPOINTS = "PathToMyBestModelCheckpoint"

2. Execute the Violence Detector by the following command:

	./Deploy.py  $(Path file name of the video to be tested)

or by the following command if you want to save the result:

	./Deploy.py  $(Path file name of the video to be tested)  $(Path file name of the resulting video)

Architecture and Design Philosophy

1. This project has the following architecture:

   • Train.py: An executable that can train the violence detection models.

   • Deploy.py: An executable that can display a video and show if it has violence event per frame.

   • Evaluate.py: An executable that can calculate the accuracies with respect to the given dataset catelog and the model checkpoints.

   • settings/: A folder that contains various settings in this projects. Most of the commonly changed variables can be found here. I prefer this design philosophy because the user can easily change several variables without get into the source code. Moreover, to isolate the customized variables here, this folder can be set as ignored by git if there're multiple developers to avoid the conflicts. Although one can also use the tf.app.flags to avoid the conflicts between the developers, I think it's kind of pain to enter so much arguments in the command line.

   • src/: Functions and Classes that used by the executables can be found here.

     • src/data: Libraries that deal with data.

     • src/layers: Convinient functions or wrappers for tensorflow. Note: The settings of layers (such as weight decay, layer initailization variables) can be found in settings/LayerSettings.py.

     • src/net: The network blueprints can be found here. You can find examples and design your own networks here. Note: Remember to change the new-developed network by editting the settings/NetSettings.py.

     • src/third_party: Third-party libraries are placed here. Currently, this folder only contains the data augmentation library: imgaug.