ASPP (Atrous Spatial Pyramid Pooling)

DeepLab V2에서 소개된 풀링 방법으로, 빈 공간을 둔 필터를 여러개 병렬로 나열해서 연산량을 줄이고 스케일에 강하게 만드는 풀링 방법.

Atrous라는 말은 hole이라는 뜻이다. Atrous 컨볼루션은 연산량을 줄이고 최대한 넓은 영역까지 커버하기 위해서 몇가지의 점들만 이용해서 풀링하는 방법이다.

그리고 Spatial Pyramid Pooling은 이를 합치는 과정을 말한다. 공간에 대해 민감하게 반응해야하는점에서 알수 있듯이, 해당 공간을 표기해야하는 Semantic Segmentation분야에서 주로 쓰인다.

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