Symbol a^*

The passage around this formula

Zoph and Le established the modern form of the idea: a controller network, trained by reinforcement learning, proposes candidate child-network architectures, each of which is trained and evaluated, with the resulting performance used as a reward signal to improve the controller [ 7 ] . Formally, a NAS run of this kind is a constrained, nested optimization: $a^* = \arg\min_{a \in \mathcal{A}} \ \mathcal{L}_{\text{val}}\big(w^*(a),\, a\big) \quad \text{subject to} \quad g(a) \le B, \qquad w^*(a) = \arg\min_{w} \ \mathcal{L}_{\text{train}}(w, a)$. where $\mathcal{A}$ is a search space of candidate architectures designed in advance by the researchers, g(a) some measured deployment cost of architecture a , and B a budget the target device imposes. Every term in that equation is a documented design choice, and the choice of g turns out to be where the edge-specific…

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