Table 6.

Some kNN optimization Schemes.

Reference	Optimization Scheme	Application	Comments
[90]	Binary code learning	Image classification	Although the k-NN model is highly compressed, accuracy is traded off for memory efficiency
[55,91]	FPGA Acceleration	Classification	Although computation time is reduced, FPGAs are difficult to program.
[70]	Model compression using Stochastic Gradient Descent	Binary and Multi-class classification	The k-NN model is highly compressed with good accuracy