• Implemented robust model and scene reference validations in both the FastAPI backend and frontend to prevent empty, corrupt, or missing files from silently failing or producing duplicated background
fallbacks.
• Enhanced scenery prompt translation on the backend to dynamically map user-specified "Image" numbers e.g. Image 1, Image 2 to Qwen-specific "Picture" placeholders Picture 1, Picture 2, avoiding template
mismatch desyncs.
Changes
• File & Path Validation: Added detailed validations to the /generate-scenery endpoint to ensure model_filename and scene_image paths exist on disk, are resolved without query parameters stripping ?t=..., are
not directories, and are openable and verifiable as PIL images.
• Identical Reference Checks: Introduced checks in both the backend and frontend submitGenerateScenery inside car.html to raise an HTTP 400 exception / display a toast warning if the model and scene references
point to the same image.
• Dynamic Prompt Mapping: Configured the backend to auto-translate occurrences of image 1/2/3 in custom scenery prompts to Picture 1/2/3, facilitating correct Qwen layout hint targeting.
• Regression Unit Tests: Wrote comprehensive unit tests test_13b_scenery_validation_checks in test_regression_api.py verifying file checking, duplicate reference detection, and query parameter stripping.
Verification
• Executed test_regression_api.py simulated API testing with 100% success 19/19 tests passed.
• Executed test_regression_qwen.py end-to-end model/hardware integration test suite successfully 2/2 tests passed.
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