Use separate convolutions in ResizeCPTransform

[acasamitjana]

Description

Use separable convolutions to speed up the low pass filtering in ResizeCPTransform

Fixes #722

Type of change

What types of changes does your code introduce to DeepReg?

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• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] Code style update (formatting, renaming)
• [X] Refactoring (no functional changes, no api changes)
• [ ] Documentation Update (fix or improvement on the documentation)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Other (if none of the other choices apply)

Checklist

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• [X] I have installed pre-commit using pre-commit install and formatted all changed files. If you are not certain, run pre-commit run --all-files.
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[codecov[bot]]

Codecov Report

Merging #748 (7813241) into main (e8f7149) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #748   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           41        41           
  Lines         2501      2485   -16     
=========================================
- Hits          2501      2485   -16     

Impacted Files	Coverage Δ
deepreg/model/layer_util.py	100.00% <ø> (ø)
deepreg/loss/kernel.py	100.00% <100.00%> (ø)
deepreg/model/layer.py	100.00% <100.00%> (ø)

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[acasamitjana]

Hi @mathpluscode @YipengHu can you check that?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.