“…The main goal of HHAC is to predict the human head attributes of a given image, including gender, age group, smiling, attraction, etc. During recent years, HHAC has attracted significant attention due to its widespread applications, including object recognition [1,2], face recognition [3,4], face verification [5,6], face retrieval [7], image retrieval [8], image search [9]and recommendation systems [10]. However, HHAC remains a challenging problem in practice because of the large variability of human head appearances in illumination, pose, expression, etc.…”