A Method for Identifying Tor Users Visiting Websites Based on Frequency Domain Fingerprinting of Network Traffic

Table 3

Selection of hyperparameters for FDF.

Parameters	Search space	Selected value
Input dimension	[500 … 7000]	5000
Wavelet	Haar, Db, Sym, Coif, Bior, and Rbio	Coif
Base Model	GoogleNet [29], ResNet [30], and DF [15]	DF
Number of FC layers	[1 … 4]	1
Hidden units (FC)	[256 … 2048]	512
Hidden dim (Self-Attention)	[128 … 2048]	256
Optimizer	SGD, adam, adamax, and RMProp	Adamax
Batch size	[32 … 256]	128
Dropout (Pooling, Self-Attention, and FC)	[0.1 … 0.8]	[0.1, 0.1, 0.5]