preprocessing.md

Preprocessing Specification

Image (visual.onnx)

• Input shape: [N, 3, 336, 336] (NCHW, batch first)
• Input dtype: float32
• Layout: RGB
• Resolution: 336×336 (center crop or resize without distortion to fill)
• Normalization: per-channel (pixel / 255 - mean) / std

Channel	mean	std
R	0.48145466	0.26862954
G	0.4578275	0.26130258
B	0.40821073	0.27577711

Text (textual.onnx)

• Input shape: [N, 77]
• Input dtype: int64
• Lowercase: yes
• Sequence: [BOS] + token_ids + [EOS], pad with 0 to length 77
• Special IDs: pad=0, unk=1, bos=2, eos=3
• Tokenizer: tokenizer.json or bpe.model (YouTokenToMe)