Implement DSFD

[ooe1123]

#131

[ooe1123]

LICENSE file required

[ooe1123]

onnxruntimeではモデルロード時、以下のエラーが発生する

Traceback (most recent call last):
  File "dsfd.py", line 352, in <module>
    main()
  File "dsfd.py", line 343, in main
    net = onnxruntime.InferenceSession(WEIGHT_PATH)
  File "/home/ooe/env1/lib/python3.8/site-packages/onnxruntime/capi/onnxruntime_inference_collection.py", line 335, in __init__
    self._create_inference_session(providers, provider_options, disabled_optimizers)
  File "/home/ooe/env1/lib/python3.8/site-packages/onnxruntime/capi/onnxruntime_inference_collection.py", line 379, in _create_inference_session
    sess.initialize_session(providers, provider_options, disabled_optimizers)
onnxruntime.capi.onnxruntime_pybind11_state.NotImplemented: [ONNXRuntimeError] : 9 : NOT_IMPLEMENTED : Could not find an implementation for Ceil(6) node with name 'tower_0/Ceil_1'

[kyakuno]

リポジトリにライセンスファイルの追加を依頼しました。
610265158/DSFD-tensorflow#27