New Collaborative Filtering Algorithms Based on SVD++ and Differential Privacy

Table 2

The meanings of the notation used to present the experimental results.

Name	Meaning
SGDBase++	Without DP protection, no preprocessing, SGD for SVD++
ALSBase++	Without DP protection, no preprocessing, ALS for SVD++
PSGD	Algorithm of [9] or Algorithm of [10], with preprocessing, SGD for MF
PALS	Algorithm of [9] or Algorithm of [10], with preprocessing, ALS for MF
DPSS	No preprocessing, SGD gradient perturbation for SVD (refer to our Algorithm 1)
DPSAObj	No preprocessing, ALS objective perturbation for SVD (refer to our Algorithm 2)
DPSAOut	No preprocessing, ALS output perturbation for SVD (refer to our Algorithm 3)
DPSS++	Our Algorithm 1, no preprocessing, SGD gradient perturbation for SVD++
DPSAObj++	Our Algorithm 2, no preprocessing, ALS objective perturbation for SVD++
DPSAOut++	Our Algorithm 3, no preprocessing, ALS output perturbation for SVD++