ap	Depth of cutting (mm)
fz	Feed per tooth (mm/z)
vc	Cutting speed (m/min)
padding	Edge extension parameter
stride	Step size
kc	Number of convolution kernels
kp	Number of pooling kernels
θ	Parameter of the objective function
η	Learning rate
(m(i), n(i))	Training set data pair
vt	Current velocity vector
vt−1	Velocity vector of the previous moment
α	Momentum factor
n	Number of wear types
TP	Number of true positive samples
FP	Number of false positive samples
Fk	Wear degree detected by the ATWVD method
Ak	Wear value measured by the optical microscope
k	Number of measured tool wear images