Collaborative Filtering(CF), a well-known approach in producing recommender systems, has achieved wide use and excellent performance not only in research but also in industry. However, problems related to cold start and data sparsity have caused CF to attract an increasing amount of attention in efforts to solve these problems. Traditional approaches adopt side information to extract effective latent factors but still have some room for growth. Due to the strong characteristic of feature extraction in deep learning, many researchers have employed it with CF to extract effective representations and to enhance its performance in rating prediction. Based on this previous work, we propose a probabilistic model that combines a stacked denoising autoencoder and a convolutional neural network together with auxiliary side information (i.e, both from users and items) to extract users and items' latent factors, respectively. Extensive experiments for four datasets demonstrate that our proposed model outperforms other traditional approaches and deep learning models making it state of the art.

If you find this model is useful for your research, please cite this paper:

• PHD: A Probabilistic Model of Hybrid Deep Collaborative Filtering for Recommender Systems ACML 2017

This is a variant of ConvMF and aSDAE. Certainly, it is based on ConvMF and aSDAE.

We use aSDAE and CNN to generate the user latent factor and item latent factor, respectively.

If you want to use it, pleae install keras and tensorflow ,respectively.

Note that this model can deal with three conditions:

• only user side information (aSDAE model)
• only item side information (ConvMF model)
• user and item side information (PHD model)

Tips：Please make sure you have a good deep learning environment to run these codes.