Smile detection, gender and age estimation using Multi-task Learning

On the original paper DEX: Deep EXpectation the authors were able to display remarkable results in classifying the age of an individual based on a given image alone.

Let see how accuracy (bad I guess), with limited resources, we can get with self-construct architecture. And not only age, we also classifying gender and smile by using multi-task training technique.

Dependencies

• Python 3.x
• OpenCV 2
• tensorflow
• numpy
• pandas
• matplotlib
• scipy
• seaborn
• MTCNN for face detection

Usage

Download datasets

First download GENKI4K and IMDB-WIKI (cropped face version) dataset.

Preprocess data

First run imdb-preprocess.ipynb. This step preprocess IMDB-WIKI dataset, filter out images with more than one face, gender is NaN and invalid age. All saved in a pickle file.

Next run prepare-data.ipynb. This will split two datasets in to training parts and test parts. The IMDB-WIKI dataset we will split into two separate datasets, gender and age datasets. So we have 3 datasets: age gender age. Each file will run into MTCNN network to detect and crop face, resize to 48x48 and convert to gray, then all datasets are saved into pickle files.

Training

Run CNN2Head_train.ipynb, using exponential decay to reduce learning rate over time. Change your datasets folder links, training parameters in const.py. Tensorboard's log will be saved in summary folder, training result in each batch is written in log.csv.

WEIGHT_INIT = 0.01
NUM_TASKS = 3
IMG_SIZE = 48
INIT_LR = 0.01
USE_BN = True
BN_DECAY = 0.99
EPSILON = 0.001
WEIGHT_DECAY = 0.01
DECAY_STEP = 1000
DECAY_LR_RATE = 0.95
BATCH_SIZE = 128

USE_GPU = True
SAVE_FOLDER = './save/current/'
NUM_EPOCHS = 2000
DROP_OUT_PROB = 0.5

Evaluation

Run evaluate.ipynb to evaluate learned model on test datasets.

Testing

For single file, see test.ipynb file for more example.

For demo on webcam, run demo.py file.

TODO

• Augmentation for balanced label, reduce overfitting
• Improve accuracy

References and Acknowledgments

This code is part of my GR project at HUST University. Following papers and codes are referred:

1. Dinh Viet Sang, Le Tran Bao Cuong, and Do Phan Thuan. 2017., Facial Smile Detection Using Convolutional Neural Networks. In The 9th International Conference on Knowledge and Systems Engineering (KSE 2017). 138–143.
2. Dinh Viet Sang, Le Tran Bao Cuong, Pham Thai Ha, Multi-task learning for smile detection, emotion recognition and gender classification, December 2017
3. IMDB-WIKI: trying a small model for age classification
4. MultiTask-MergeDataset - Le Tran Bao Cuong