[Feature]: support dynamic shape for grid_anchor#4684

Merged

ZwwWayne merged 3 commits intoopen-mmlab:masterfrom RunningLeon:dev_dynamic_shape

Mar 3, 2021

+17-7

Commits on Feb 24, 2021

make anchor_generator exportable to ONNX
RunningLeon
committed

Commits on Feb 25, 2021

make k of topk dynamic for onnx
RunningLeon
committed

Commits on Mar 1, 2021

rename nms_pre_t -> nms_pre_tensor
RunningLeon
committed