A deep convolutional network implementation for Deepfake detection.
Ayan Mitra, 2020
The goal of this proect is to build a pipeline for detecting whether a given video, is a real or fake video.
This repository contains the souce code for classifying videos whether they are Deepfakes or not. Deepfake algorithms can create fake images and videos that humans can't detect from the authentic one. Generation of Deepfakes has begun to erode people's trust in media and question on their reliability and unbiasedness. Therefore the accurate identification of Deepfake videos via the establishement of robust pipeline is going to be necessary at present.
Deep learning algorithms in recent years have been comprehensively used to solve various complex problems. It is also showing promising results in terms of Deepfake detection. Various established deep learning based architectures are successfully used for Deepfake detections as well as coninuous ongoing researches are developing better algorithms.
Our algorithm for Deepfake detection is a deep convolutional network based on the state of the art Inception Resnet V2 architecture. This stems from the family of Inception deep convolutional architecture originally called as the GoogLeNet. Res Net : Residual Network with Stochastic Gradient Descent. It is trained on more than a million images from the ImageNet database. The network is 164 layers deep with 56๐ parameters and can classify images into 1000 object categories. As a result, the network has learned rich feature representations for a wide range of images. We use pretrained 'imagenet' for weights initialization while keeping the training option on i.e. trainable=True.
Our classification is based on frame by frames approach from a given video. We train our neural network on the frames from the videos labelled as 'fake' and 'real' and then generate a model which can be used to identify new videos as fake or real. We used open CV2 for extracting frames from the videos and then used the dlib library to detect faces in them.
To train our classifier, we made use of '.mp4' videos, seperated into binary labels : [Fake, Real]. There were 200 videos of each label. Length of videos vary roughly between few seconds to 2 minutes and file sizes on an averge are <20 MB but files as big as 110 MB were also used.
Pooling : Global Average Pooling
Acitvation : Softmax
Optimizer : Adam
Batch Size : 80
Accuracy : 99.7%() for Training to terminate
Accuracy % = 98.5 ()
True positive = 11157 , 51.87%
False positive = 192 , 0.89%
False negative = 130 , 0.60%
True negative = 10031 , 46.63%
The accuracy and Loss of the train and test sets are plotted below.
We see that there is a tendency for the validation set to overfit as can be seen from the Loss function plot. We speculate further future improvements on the model can be made, by fine tunning the hyperparameters. This includes attention to reducing the overfitting tendency (though this is not highly pronounced, but can be improved). Adding suitable 'dropout' layer could assist in this condition, aditionally the learning rate of the 'Adam' optimizer can be further scrutinized by adding decay parameter. Over a longer period of 6 months time, the pipeline can be made more efficient firstly training on bigger sample size. A continous learning curve with updated videos is primary for the network to stay updated. Hyperparameter optimization like mentioned before should be further investigated as well as the idea to explore other architectures for more efficiency. We have used Inception Resnet V2 architecture here, which scores very well and is quite robust, yet more modern alternate achitectures are getting updated and scores with higher accuracy. A thorough comparison is made of all the state of the art current architectures which fares good, in Deepfake detection in this paper. In future applying such networks would be a strong case to test the benchmark of our model and improve on it.
1. Deep Network for Deep Fakes Detection Notebook
2. To Check a Video for Fake/Real Based on the Model from above
An Example screenshot of a video verification is shown below
A screen shot of the notebook showing the tested video, and its verdict which in this case is Fake.
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