IEEE Computational Intelligence Magazine - August 2021 - 28

D. Fast Evolution by Eliminating Operations
One of the most challenging aspects of NAS lies in the inefficient
search process, and we address this issue by eliminating
the operations with the least potential. The multi-armed bandit
problem is similar to the NAS problem. The Upper Confidence
Bound (UCB) is used for dealing with the explorationexploitation
dilemma in the multi-armed bandit problem.
srk
=+
2 Nlog
nk
,
(8)
where rk represents the average reward obtained by arm k. nk
represents the number of times arm k has been selected in the
total number of trials N.
After || Ei
X ) epochs, we remove the operations in each
block based on performances (loss) and the sampling times.
Inspired by the UCB algorithm, we define the combination of
the two as
wo lo () ()
kn
i
=,,
kn
i
is
the number of times the kth operation of the ith block
has been selected. The first item ()
i
lo ,kn
i
2 N
sa
log
k
i
,
(9)
where N is the total number of evolutions and mutations, and
sak
in (9) is calculated based
on an accumulation of the validation loss, and the second term
is the exploration term. The operation with the maximum w
Airplane
Automobile
Bird
Cat
Deer
Dog
Frog
Horse
Ship
Truck
FIGURE 3 Some pictures and corresponding labels of the CIFAR10 dataset.
28 IEEE COMPUTATIONAL INTELLIGENCE MAGAZINE | AUGUST 2021

IEEE Computational Intelligence Magazine - August 2021

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