Delete mmdet.ops (#4325)

* FPN deprecated warning

* FPN deprecated warning

* Delete mmdet.ops because it has been moved to mmcv

mmdet/ops/__init__.py

@@ -1,32 +0,0 @@
-# This file is added for back-compatibility. Thus, downstream codebase
-# could still use and import mmdet.ops.
-
-# yapf: disable
-from mmcv.ops import (ContextBlock, Conv2d, ConvTranspose2d, ConvWS2d,
-                      CornerPool, DeformConv, DeformConvPack, DeformRoIPooling,
-                      DeformRoIPoolingPack, GeneralizedAttention, Linear,
-                      MaskedConv2d, MaxPool2d, ModulatedDeformConv,
-                      ModulatedDeformConvPack, ModulatedDeformRoIPoolingPack,
-                      NonLocal2D, RoIAlign, RoIPool, SAConv2d,
-                      SigmoidFocalLoss, SimpleRoIAlign, batched_nms,
-                      build_plugin_layer, conv_ws_2d, deform_conv,
-                      deform_roi_pooling, get_compiler_version,
-                      get_compiling_cuda_version, modulated_deform_conv, nms,
-                      nms_match, point_sample, rel_roi_point_to_rel_img_point,
-                      roi_align, roi_pool, sigmoid_focal_loss, soft_nms)
-
-# yapf: enable
-
-__all__ = [
-    'nms', 'soft_nms', 'RoIAlign', 'roi_align', 'RoIPool', 'roi_pool',
-    'DeformConv', 'DeformConvPack', 'DeformRoIPooling', 'DeformRoIPoolingPack',
-    'ModulatedDeformRoIPoolingPack', 'ModulatedDeformConv',
-    'ModulatedDeformConvPack', 'deform_conv', 'modulated_deform_conv',
-    'deform_roi_pooling', 'SigmoidFocalLoss', 'sigmoid_focal_loss',
-    'MaskedConv2d', 'ContextBlock', 'GeneralizedAttention', 'NonLocal2D',
-    'get_compiler_version', 'get_compiling_cuda_version', 'ConvWS2d',
-    'conv_ws_2d', 'build_plugin_layer', 'batched_nms', 'Conv2d',
-    'ConvTranspose2d', 'MaxPool2d', 'Linear', 'nms_match', 'CornerPool',
-    'point_sample', 'rel_roi_point_to_rel_img_point', 'SimpleRoIAlign',
-    'SAConv2d'
-]