Add the efficientdet model (#582)
Summary:
Source: https://github.com/rwightman/efficientdet-pytorch
Data: coco2017-minimal (use val for both train and test)
The model only runs on A100 (will CUDA OOM on V100).
It supports AMP, but it is disabled by default.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/582
Reviewed By: erichan1
Differential Revision: D35150696
Pulled By: xuzhao9
fbshipit-source-id: 0b6cfdd1faca92dd11ddd994d8c7296a8ff85f47
