A Movie Recommendation System Based on Differential Privacy Protection

Table 2

DP-tree data structure.

Prior	Value	Num	EndNum	Depth	Child[i]
—	R	—	—	0	[a, d2, f]
R	a	10	0	1	[b, d1]
A	b	5	3	2	[c]
B	c	2	2	3	—
A	d1	5	5	2	—
R	D2	6	0	1	[e1]
d2	E1	6	6	2	—
F	E2	4	4	2	—
R	f	4	0	1	[e2]