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Implementation of NMS op for east detection #10935

@wanghaoshuang

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@wanghaoshuang

当前的NMS op仅支持rectangle boxes. 而east detection需要对quadrangle boxes做NMS.

  • 表示不同: 一个batch的rectangles用[M, N, 4]的Tensor表示, quadrangles需要用[M, N, 8]的Tensor表示。

  • 两个Boxes的Overlap计算方式不同

  • 支持的classes number不同

方案:

  1. 改造现有NMS op
  2. 新增op

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