[Fix] Fix in-place operator in RAFT

[Zachary-66]

Motivation

In Issue #248, there is a bug when fine-tuning RAFT, which is caused by an inappropriate in-place operator. This PR aims to fix this bug.

Modification

mmflow/models/utils/res_layer.py

[codecov]

Codecov Report

Base: 68.80% // Head: 69.02% // Increases project coverage by +0.22% 🎉

Coverage data is based on head (44a611e) compared to base (99154a1).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
+ Coverage   68.80%   69.02%   +0.22%     
==========================================
  Files          92       93       +1     
  Lines        5148     5195      +47     
  Branches      733      741       +8     
==========================================
+ Hits         3542     3586      +44     
- Misses       1491     1495       +4     
+ Partials      115      114       -1     

Flag	Coverage Δ
unittests	69.02% <100.00%> (+0.22%)	⬆️

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

Impacted Files	Coverage Δ
mmflow/models/decoders/raft_decoder.py	93.71% <ø> (ø)
mmflow/models/utils/attention1d.py	100.00% <100.00%> (ø)
mmflow/models/utils/res_layer.py	95.29% <100.00%> (ø)
mmflow/version.py	61.53% <100.00%> (ø)
mmflow/datasets/pipelines/transforms.py	78.66% <0.00%> (-0.67%)	⬇️
mmflow/utils/misc.py	100.00% <0.00%> (+4.76%)	⬆️

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