Fix output channel calculation in PixelShuffle2DUpBlock - #40
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…r spatial downsample factor. Erroenous behavior from previous refactor due to lack of caution. With pixel shuffle upsampling, the channel should reduce proportional to the combined 2D sptial expansion as opposed to remaining identical. This also fixes the problem of older (up to v0.7) model loading.
… channel perserving and unpreserving behavior for maximized backward compatibility. The default behavior for unext initialization is channel non-preserving which is the more reasonable yet lower capacity version.
…proved configuration handling and backward compatibility
…ut_h and out_w only works for a specific directional of sampling against a very specific block type.
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Pull request overview
Corrects PixelShuffle upsampling channel sizing while adding an opt-in legacy preservation mode.
Changes:
- Reduces output channels proportionally to 2D expansion.
- Adds channel-preservation configuration.
- Updates stage calculations and tests.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.
| File | Summary |
|---|---|
tests/models/test_up_down_blocks.py |
Tests reduced and preserved channel behavior. |
src/virtual_stain_flow/models/unext.py |
Wires and serializes channel preservation; missing-key fallback may break loading older checkpoints. |
src/virtual_stain_flow/models/stages.py |
Updates stage spatial-dimension calculations. |
src/virtual_stain_flow/models/blocks/up_down_blocks.py |
Implements proportional PixelShuffle channel reduction. |
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MikeLippincott
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MikeLippincott
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LGTM, nice PR with the legacy support!
|
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe PR adds configurable channel preservation and validation to ChangesPixel-shuffle decoder behavior
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant ConvNeXtUNet
participant Decoder
participant PixelShuffle2DUpBlock
ConvNeXtUNet->>Decoder: pass preserve_channels kwargs
Decoder->>PixelShuffle2DUpBlock: construct pixel-shuffle up blocks
PixelShuffle2DUpBlock-->>Decoder: provide configured output channels
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…kward compatibility
…hannels instead of overwriting out channels for extra clarity
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Actionable comments posted: 1
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Inline comments:
In `@src/virtual_stain_flow/models/blocks/up_down_blocks.py`:
- Line 309: In the channel calculation for the relevant block initialization,
validate that the floor-divided out_channels value is positive when
preserve_channels is false before constructing AbstractBlock. Reject only zero
or negative reductions, while preserving the existing behavior for positive,
non-divisible channel counts and the preserve_channels path.
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src/virtual_stain_flow/models/blocks/up_down_blocks.pysrc/virtual_stain_flow/models/stages.pysrc/virtual_stain_flow/models/unext.pytests/models/test_up_down_blocks.py
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…ng test to ensure lower than expected input channel count throws an error with explanation.
… backward compatibility for ConvNeXtUNet, fixes to PixelShuffle2DUpBlock output channel calculation, and updates to Stage spatial-shape propagation and tests.
…thin [0, 1] range
…d bump version to 0.4.10
|
Thanks @MikeLippincott and coderabbit for reviewing. Merging now. |
Older behavior is erroneous behavior from previous refactor due to lack of caution.
With pixel shuffle up sampling, the channel should reduce proportional to the combined 2D spatial expansion as opposed to remaining identical:
Summary by CodeRabbit
New Features
Bug Fixes
Tests