Local Response Normalization

2000년 도입 · 논문 421편에서 사용

Local Response Normalization is a normalization layer that implements the idea of lateral inhibition. Lateral inhibition is a concept in neurobiology that refers to the phenomenon of an excited neuron inhibiting its neighbours: this leads to a peak in the form of a local maximum, creating contrast in that area and increasing sensory perception. In practice, we can either normalize within the same channel or normalize across channels when we apply LRN to convolutional neural networks. $$ b_{c} = a_{c}\left(k + \frac{\alpha}{n}\sum_{c'=\max(0, c-n/2)}^{\min(N-1,c+n/2)}a_{c'}^2\right)^{-\beta} $$ Where the size is the number of neighbouring channels used for normalization, $\alpha$ is multiplicative factor, $\beta$ an exponent and $k$ an additive factor

출처: ImageNet Classification with Deep Convolutional Neural Networks

소개 논문: ImageNet Classification with Deep Convolutional Neural Networks