[WIP] Add Flow1D Algorithm

[Zachary-66]

Motivation

Add Flow1D algorithm. This PR is based on #213 and the official code of Flow1D. Thanks for their excellent work!

Modification

1.configs/_base_/models/flow1d.py
2. configs/flow1d/flow1d_8xb2_100k_flyingchairs-368x496.py
3. mmflow/datasets/transforms/transforms.py (fix a bug)
4. mmflow/models/decoders/__init__.py
5. mmflow/models/decoders/flow1d_decoder.py
6. mmflow/models/flow_estimators/__init__.py
7. mmflow/models/flow_estimators/flow1d.py
8. mmflow/models/utils/__init__.py
9. mmflow/models/utils/attention1d.py
10. mmflow/models/utils/corr_lookup.py
11. mmflow/models/utils/correlation1d.py
12. tests/test_models/test_decoders/test_flow1d_decoder.py
13. tests/test_models/test_flow_estimators.py
14. tests/test_models/test_utils/test_corr_lookup.py

TODO

Reproduce the metrics of the original paper.

[codecov]

Codecov Report

Base: 73.03% // Head: 75.19% // Increases project coverage by +2.16% 🎉

Coverage data is based on head (1f5d98c) compared to base (712ffdb).
Patch coverage: 93.86% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x     #255      +/-   ##
===========================================
+ Coverage    73.03%   75.19%   +2.16%     
===========================================
  Files           96      100       +4     
  Lines         4950     5160     +210     
  Branches       623      640      +17     
===========================================
+ Hits          3615     3880     +265     
+ Misses        1220     1155      -65     
- Partials       115      125      +10     

Flag	Coverage Δ
unittests	75.19% <93.86%> (+2.16%)	⬆️

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

Impacted Files	Coverage Δ
mmflow/datasets/transforms/transforms.py	72.62% <0.00%> (ø)
mmflow/models/decoders/flow1d_decoder.py	90.00% <90.00%> (ø)
mmflow/models/utils/attention1d.py	95.74% <95.74%> (ø)
mmflow/models/decoders/__init__.py	100.00% <100.00%> (ø)
mmflow/models/flow_estimators/__init__.py	100.00% <100.00%> (ø)
mmflow/models/flow_estimators/flow1d.py	100.00% <100.00%> (ø)
mmflow/models/utils/__init__.py	100.00% <100.00%> (ø)
mmflow/models/utils/corr_lookup.py	98.80% <100.00%> (+0.93%)	⬆️
mmflow/models/utils/correlation1d.py	100.00% <100.00%> (ø)
mmflow/models/decoders/gma_decoder.py	97.97% <0.00%> (+2.02%)	⬆️
... and 6 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.