Table 2.

Supervised/unsupervised machine learning methods.

Supervised ML	ANN based method in VLP (visible light positioning)  [18]
	NLOS classification and mitigation based on RSSI [20] and TOA [58]
	DNN based device-free localization  [21]
	CNN and DNN completion and refinement for EDM recovery  [28]
	Hybrid SVM- and DNN-based method  [28]
	KNN and Naive Bayes methods with RSSI fingerprints  [24]
	CNN-LSTM-based hybrid deep learning with RSSI heat map  [39]
	SVM and Gaussian Process regressions for LOS/NLOS identification, classification and error mitigation [101,102,103,104,105,106,107,108]
	ANN and CNN based method to identify and to estimate position of room with human object [109]
Unsupervised ML	Isloation forest-based classification method  [19]
	Ranging module-based NN method for trilateration  [22]
	k-means RSSI-based classification for improving accuracy  [25]
	VAE-based semi-supervised learning model with latent variables  [38]
	PDR-based reliable unsupervised approach with iBeacon corrections and fingerprint database auto-building [13]