A CNN based pytorch implementation on facial expression recognition (FER2013 and CK+), achieving 73.112% (state-of-the-art) in FER2013 and 94.64% in CK+ dataset

• Python 2.7
• Pytorch >=0.2.0
• h5py (Preprocessing)
• sklearn (plot confusion matrix)

• Firstly, download the pre-trained model from https://drive.google.com/open?id=1Oy_9YmpkSKX1Q8jkOhJbz3Mc7qjyISzU (or https://pan.baidu.com/s/1gCL0TlCwKctAy_5yhzHy5Q, key: g2d3) and then put it in the "FER2013_VGG19" folder; Next, Put the test image (rename as 1.jpg) into the "images" folder, then
• python visualize.py

• Dataset from https://www.kaggle.com/c/challenges-in-representation-learning-facial-expression-recognition-challenge/data Image Properties: 48 x 48 pixels (2304 bytes) labels: 0=Angry, 1=Disgust, 2=Fear, 3=Happy, 4=Sad, 5=Surprise, 6=Neutral The training set consists of 28,709 examples. The public test set consists of 3,589 examples. The private test set consists of another 3,589 examples.

• first download the dataset(fer2013.csv) then put it in the "data" folder, then
• python preprocess_fer2013.py

• python mainpro_FER.py --model VGG19 --bs 128 --lr 0.01

• python plot_fer2013_confusion_matrix.py --model VGG19 --split PrivateTest

• Model： VGG19 ; PublicTest_acc： 71.496% ; PrivateTest_acc：73.112%
  
• Model： Resnet18 ; PublicTest_acc： 71.190% ; PrivateTest_acc：72.973%

• The CK+ dataset is an extension of the CK dataset. It contains 327 labeled facial videos, We extracted the last three frames from each sequence in the CK+ dataset, which contains a total of 981 facial expressions. we use 10-fold Cross validation in the experiment.

• python mainpro_CK+.py --model VGG19 --bs 128 --lr 0.01 --fold 1

• python k_fold_train.py

• python plot_CK+_confusion_matrix.py --model VGG19

• Model： VGG19 ; Test_acc： 94.646%
  
• Model： Resnet18 ; Test_acc： 94.040%