license: gemma
base_model: google/gemma-4-E2B-it-qat-q4_0-unquantized
tags:
- mlx
- vision
- gemma4
- image-text-to-text
library_name: mlx
Rytability Gemma 4 Vision Tower
The vision tower for Rytability's Gemma 4 E2B model, published as a separate download so the app can ship the text weights alone and fetch image support only for users who want it.
| File | model-vision.safetensors |
| Size | 337,171,954 bytes |
| Tensors | 659 (vision_tower.*, embed_vision.*) |
| Precision | BF16 (unquantized) |
| sha256 | 5b322b050d1f32f0d52203376c04dfe1fbbcd5e41f743d10cf0febf273fec293 |
| Source | google/gemma-4-E2B-it-qat-q4_0-unquantized |
Why BF16
The tower is downloaded rather than bundled, so it does not count against the app's on-device size budget. Keeping it at full precision is close to free and it matters for OCR quality: quantizing to 4-bit costs roughly 17 points of OCR accuracy to save about 220 MB, which is a bad trade for an app whose scanning feature reads receipts, handwriting and notes.
Not interchangeable with the Gemma 3 tower
Gemma 4's vision tower is a different architecture with different tensor names and shapes. It cannot be paired with Gemma 3 text weights, and Gemma 3 vision weights cannot be paired with Gemma 4 text weights. The two halves of a model must be swapped together.
Usage
The file is loaded alongside matching Gemma 4 E2B text weights in a single
directory; MLX reads every *.safetensors in that directory as one model.
License
Gemma Terms of Use: https://ai.google.dev/gemma/terms