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mlx-beam-vision

The towers that let mlx-beam see. Install it next to the engine (pip install mlx-beam[vision], or this package by name) and a checkpoint that ships a vision tower serves images: an image_url part with a data: URL in a chat request, the checkpoint's own processor renders the template, the tower encodes the image, and the engine's prefill takes the image's features in place of the placeholder tokens - beside text-only requests in the same batch, with the prefix cache keyed on the image's digest. Without this package the engine answers image input with a 400 that names the vision extra.

Towers vendored from mlx-vlm (MIT, see mlx_beam_vision/_vendor/VENDORED.md):

Family Models Notes
qwen3_vl Qwen3-VL, Qwen3.5, Qwen3.8 DeepStack applied: the tower's intermediate features are added after the text model's first layers; the text model's multimodal positions (MRoPE: time, height, width per image token) are built from the processor's grids and applied through prefill, cache and decoding
mistral3 Mistral Small 3.x (Pixtral tower) the image's rows are separate spans ([IMG_BREAK] between them)
gemma4 Gemma 4 E2B, E4B image only; audio is not served yet. The 12B (gemma4_unified, encoder-free, its image tokens attending bidirectionally in the text model) is refused with that reason until the text trunk takes such a mask
muse_glimmer Muse Glimmer the projector's norm matches the text model's input norm
granite4_vision Granite Vision 4.1 AnyRes tiles, window Q-Former projectors; nothing at the embedding, every projector's features added ahead of its text layer

Not yet: audio and video input, quantized towers (the towers load at model precision; a package that ships a quantized tower is refused with a message). An image above 32 megapixels is refused before it is decoded.

The package installs torch and torchvision: the processors transformers ships for these families (the template rendering and the image-to-patches step) are written on them. The towers themselves run on MLX; torch does no inference here.

Every family is exercised in the tests on a tiny random tower against a direct forward; the real towers and processors are validated on Apple silicon with the checkpoints themselves.

/health.vision reports the family, the tower, the processor and the feature cache (encoder outputs by image digest, bounded in bytes).

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