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Add alphabet-only model (27-class) alongside alphanumeric (37-class)
hermitkk +1: Claude Sonnet 4.6 - Two separate models: alphabet (A-Z + blank, 27 classes) and
alphanumeric (digits + A-Z + blank, 37 classes, case-folded)
- Both models predict case-insensitively (upper/lowercase merged)
- Reorganize outputs into checkpoints/{alphabet,alphanumeric}/ subfolders
- Update dataset, model, train, infer, and export code to support both modes
- ONNX models uploaded separately via huggingface_hub
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>