[Model] SPTS

[gaotongxiao]

Depends on #1678

Todo:

• Readme
• Official checkpoint conversion scripts

[codecov]

Codecov Report

Base: 85.87% // Head: 85.61% // Decreases project coverage by -0.27% ⚠️

Coverage data is based on head (940f6a7) compared to base (39f99ac).
Patch coverage: 68.37% of modified lines in pull request are covered.

❗ Current head 940f6a7 differs from pull request most recent head 2551f2a. Consider uploading reports for the commit 2551f2a to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1696      +/-   ##
===========================================
- Coverage    85.87%   85.61%   -0.27%     
===========================================
  Files          173      175       +2     
  Lines        10919    10950      +31     
  Branches      1529     1526       -3     
===========================================
- Hits          9377     9375       -2     
- Misses        1276     1310      +34     
+ Partials       266      265       -1     

Flag	Coverage Δ
unittests	85.61% <68.37%> (-0.27%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmocr/datasets/ocr_dataset.py	100.00% <ø> (ø)
mmocr/datasets/transforms/loading.py	89.51% <ø> (-1.80%)	⬇️
mmocr/utils/bezier_utils.py	23.25% <23.25%> (ø)
mmocr/datasets/recog_lmdb_dataset.py	82.00% <86.20%> (-10.31%)	⬇️
mmocr/datasets/samplers/repeat_aug.py	100.00% <100.00%> (ø)
mmocr/utils/polygon_utils.py	98.73% <100.00%> (+1.26%)	⬆️
mmocr/utils/typing_utils.py	97.05% <100.00%> (+0.18%)	⬆️
.../models/textdet/postprocessors/db_postprocessor.py	89.04% <0.00%> (-4.11%)	⬇️
...r/models/kie/postprocessors/sdmgr_postprocessor.py	91.17% <0.00%> (ø)
... and 2 more

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