Add MobileViT fast image processor #38859
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- Implement MobileViTImageProcessorFast class inheriting from BaseImageProcessorFast - Add support for RGB to BGR channel flipping specific to MobileViT models - Override _preprocess method to handle channel order transformation using torchvision ops - Update test infrastructure to test both slow and fast processors - Add fast processor to auto image processing registry - Update documentation to include fast processor Fixes huggingface#36978
- Implement MobileViTImageProcessorFast using BaseImageProcessorFast - Add GPU-accelerated processing for mobile deployment scenarios - Support channel flipping (RGB to BGR) via custom _preprocess method - Update tests to support both slow and fast processors - Verified functional equivalence and 1.35x average performance improvement - Achieves 1.8x speedup for optimal batch sizes (16-32 images)
- Apply black formatting to meet CI requirements - Fix line length issues and add missing blank lines - Ensure compliance with transformers code style
- Apply black formatting to resolve all CI linter issues - Format both image_processing_mobilevit_fast.py and test_image_processing_mobilevit.py - Resolve conflicts between black and ruff formatters - Ensure compliance with transformers code style standards - All functionality preserved after formatting changes
- Use ruff format as primary formatter per transformers repository standards - Format both image_processing_mobilevit_fast.py and test_image_processing_mobilevit.py - Resolve all CI formatting compliance issues - All functionality preserved after formatting changes
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cc @yonigozlan |
…sorFast - Implements missing method to fix CI error about undocumented public method - Method handles semantic segmentation output post-processing with optional target size resizing - Follows same pattern as slow processor implementation - Includes proper error handling for missing PyTorch dependency
- Fix line length issues to comply with black formatting standards - Break long lines in method signatures and function calls - Ensure code meets both ruff and black quality standards
- Ensure all code meets HuggingFace quality standards - Fix formatting conflicts between black and ruff - Ready for final commit and push
- Reformatted src/transformers/models/mobilevit/image_processing_mobilevit_fast.py - Reformatted tests/models/mobilevit/test_image_processing_mobilevit.py - Fixed line length issues and consistent spacing - Ensures CI ruff checks pass
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@yonigozlan checks are passing on both PRs for fast image transformers let me know if it’s good to merge |
yonigozlan
reviewed
Jun 18, 2025
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Hello @leonchlon ,
There's already a PR close to be merged on MobileViT here #37143
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@yonigozlan no worries, i'll keep this open until the other is closed just in case anything comes up |
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Summary
This PR adds a fast image processor for MobileViT models, providing significant performance improvements while maintaining full functional equivalence with the existing slow processor.
Changes
MobileViTImageProcessorFastclass insrc/transformers/models/mobilevit/image_processing_mobilevit_fast.pydo_flip_channel_orderparameterPerformance Improvements
Technical Implementation
_preprocessmethod handles RGB→BGR conversion (required for MobileViT)shortest_edgeformat consistency with slow processor viadefault_to_square=Falsedo_normalize=None)Testing
Backward Compatibility
Implementation Notes
The custom
_preprocessmethod was necessary becauseBaseImageProcessorFastdoes not support thedo_flip_channel_orderparameter required by MobileViT models. This follows the same pattern used by other fast processors (LayoutLMv2, DepthPro) that require specialized preprocessing steps.