rohitg00/ai-engineering-from-scratch · error · ValueError

image_size and patch_size must be positive, got {image_size=

Error message

image_size and patch_size must be positive, got {image_size=} {patch_size=}

What it means

Error "image_size and patch_size must be positive, got {image_size=} {patch_size=}" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at phases/12-multimodal-ai/01-vision-transformer-patch-tokens/code/main.py:42

    depth: int
    heads: int
    registers: int = 0
    cls_token: bool = True


ZOO = [
    ViTConfig("ViT-B/16 @ 224", 224, 16, 768, 12, 12),
    ViTConfig("ViT-L/14 @ 336 (CLIP)", 336, 14, 1024, 24, 16),
    ViTConfig("DINOv2 ViT-g/14 @ 224", 224, 14, 1536, 40, 24, registers=4),
    ViTConfig("SigLIP SO400m/14 @ 378", 378, 14, 1152, 27, 16, registers=4,
              cls_token=False),
    ViTConfig("Qwen2.5-VL ViT @ 896x896", 896, 14, 1280, 32, 16),
]


def grid_shape(image_size: int, patch_size: int) -> tuple[int, int]:
    if image_size <= 0 or patch_size <= 0:
        raise ValueError(f"image_size and patch_size must be positive, got {image_size=} {patch_size=}")
    if image_size % patch_size != 0:
        raise ValueError(f"image_size ({image_size}) must be divisible by patch_size ({patch_size})")
    g = image_size // patch_size
    return (g, g)


def seq_length(cfg: ViTConfig) -> int:
    h, w = grid_shape(cfg.image_size, cfg.patch_size)
    extra = (1 if cfg.cls_token else 0) + cfg.registers
    return h * w + extra


def patch_embed_params(cfg: ViTConfig) -> int:
    p = cfg.patch_size
    return 3 * p * p * cfg.hidden + cfg.hidden


def pos_embed_params(cfg: ViTConfig) -> int:

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at phases/12-multimodal-ai/01-vision-transformer-patch-tokens/code/main.py:42 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rohitg00/ai-engineering-from-scratch@39ea8a1c6d (2026-08-26). Data as JSON: /api/errors/e99acb7baf6022e7. Report an issue: GitHub.