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* reduce 1e-12 to make difference between variables

If 1e-12 is used to make a difference between t1 and t2, then later (t2-t1) might become 0 as 1e-12 can't affect to the number (at least true in pytorch, verified in v1.5.0+).

* Revert "reduce 1e-12 to make difference between variables"

This reverts commit 33ec7215d22be59bf0012dea748f5cacc33a0fb8.

* reduce 1e-12 to make difference between variables

If 1e-12 is used to make a difference between t1 and t2, then later (t2-t1) might become 0 as 1e-12 can't affect to the number (at least true in pytorch, verified in v1.5.0+). Not sure whether 1e-7 or 1e-8 worked. But 1e-6 did.

* Add header for files

* Add header for files

* Add header for files

* Add header for files

* Fix docstring typos and change formats for api-doc to work

* Test on fixing noqa

* Fix noqa

* Fix noqa

* support 3dssd

* support one-stage method

* for lint

* support two_stage

* Support all methods

* remove init_cfg=[] in configs

* test

* support h3dnet

* fix lint error

* fix isort

* fix code style error

* fix imvotenet bug

* rename init_weight->init_weights

* clean comma

* fix test_apis does not init weights

* support newest mmdet and mmcv

* fix test_heads h3dnet bug

* rm *.swp

* remove the wrong code in build.yml

* fix ssn low map

* modify docs

* modified ssn init_config

* modify params in backbone pointnet2_sa_ssg

* add ssn direction init_cfg

* support segmentor

* add conv a=sqrt(5)

* Convmodule uses kaiming_init

* fix centerpointhead init bug

* add second conv2d init cfg

* add unittest to confirm the input is not be modified

* assert gt_bboxes_3d

* rm .swag

* modify docs mmdet version

* adopt fcosmono3d

* add fcos 3d original init method

* fix mmseg version

* add init cfg in fcos_mono3d.py

* merge newest master

* remove unused code

* modify focs config due to changes of resnet

* support imvoxelnet pointnet2

* modified the dependencies version

* support decode head

* fix inference bug

* modify the useless init_cfg

* fix multi_modality BC-breaking

* fix error blank

* modify docs error

* Support to train using FP16

* fix type inconsistency error on naive syncBN

* resolve comments

* clean nan check

Update mmdet3d/models/dense_heads/anchor3d_head.py, mmdet3d/models/dense_heads/free_anchor3d_head.py, mmdet3d/models/dense_heads/parta2_rpn_head.py, mmdet3d/models/dense_heads/train_mixins.py, mmdet3d/models/dense_heads/vote_head.py, mmdet3d/models/roi_heads/bbox_heads/parta2_bbox_head.py, mmdet3d/models/roi_heads/mask_heads/pointwise_semantic_head.py, mmdet3d/models/roi_heads/roi_extractors/single_roiaware_extractor.py, mmdet3d/models/roi_heads/base_3droi_head.py, mmdet3d/models/roi_heads/part_aggregation_roi_head.py files