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1d4c4d4cb2
Fixes shape mismatch bug in multi-subset training where CDC preprocessing and training used different index calculations, causing wrong CDC data to be loaded for samples. Changes: - CDC cache now stores/loads data using image_key strings instead of integer indices - Training passes image_key list instead of computed integer indices - All CDC lookups use stable image_key identifiers - Improved device compatibility check (handles "cuda" vs "cuda:0") - Updated all 30 CDC tests to use image_key-based access Root cause: Preprocessing used cumulative dataset indices while training used sorted keys, resulting in mismatched lookups during shuffled multi-subset training.