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nllb200-coreml-1024-palettized
aoiandroid/nllb200-coreml-1024-palettized
nllb200-coreml-1024-palettized is a translation model from aoiandroid. Use it when you need text moved from one language to another. The card lists the license as cc-by-nc-4.0.
8-bit palettized CoreML variant of facebook/nllb-200-distilled-600M for on-device inference on Apple platforms (iPhone, iPad, Mac). Same architecture and max length (1024) as the float16 base, with smaller size and on…
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At a glance
- Task
- Translation
- License
- cc-by-nc-4.0
- Model type
- m2m_100
- Access
- Public
- Created
- Mar 19, 2026
- Updated
- May 17, 2026
- SHA
- 96472b9c
Base models
Datasets
Model card
From the Hugging Face model README
NLLB-200 CoreML 1024 (8-bit Palettized)
8-bit palettized CoreML variant of facebook/nllb-200-distilled-600M for on-device inference on Apple platforms (iPhone, iPad, Mac). Same architecture and max length (1024) as the float16 base, with smaller size and one build for all devices.
Base model (official)
This CoreML model is derived from facebook/nllb-200-distilled-600M (NLLB-200 distilled 600M on the Hub). Key official specs:
| Item | Official value |
|---|---|
| Model type | M2M100 (encoder-decoder) |
| Parameters | ~600M (distilled) |
| Languages | 200 (Flores-200 coverage) |
| Max position embeddings | 1024 (config.json) |
| Vocab size | 256,206 |
| License | CC-BY-NC-4.0 |
From the base model card: research and non-commercial use; single-sentence translation; not for production, medical, or legal domain; training used input lengths not exceeding 512 tokens (longer sequences may degrade). Not for certified translation. For full intended use, limitations, metrics (BLEU, spBLEU, chrF++), and ethical considerations, see the official model page.
Note: Other NLLB variants (e.g. larger or MoE) may support longer context (e.g. 128k); this CoreML conversion follows the distilled 600M config, which has max 1024.
Model description
- Base model: facebook/nllb-200-distilled-600M
- Precision: 8-bit palettized (encoder and decoder)
- Max length: 1024 tokens, aligned to official
max_position_embeddings - Architecture: Encoder + KV-cache decoder (init + step), same as aoiandroid/nllb200-coreml-1024.
Difference from the float16 repo
| nllb200-coreml-1024 | nllb200-coreml-1024-palettized (this repo) | |
|---|---|---|
| Precision | Float16 | 8-bit palettized |
| Size | Larger | Smaller |
| Use case | Higher precision on device | Same quality with lower memory and storage |
Same file layout and usage (encoder + decoder init + decoder step + tokenizer + config).
Files
| File / folder | Description |
|---|---|
NLLB_Encoder_1024.mlpackage | Encoder (8-bit palettized) |
NLLB_Decoder_1024_init.mlpackage | Decoder first step |
NLLB_Decoder_1024_step.mlpackage | Decoder subsequent steps (KV cache) |
tokenizer/ | SentencePiece tokenizer |
config.json | Model config |
Usage
Same as the float16 model: load encoder, decoder init, and decoder step; encode source with the included tokenizer; run decoder loop with KV cache until EOS or max length. See aoiandroid/nllb200-coreml-1024 for a detailed usage description.
Conversion
Produced from the float16 CoreML export by applying 8-bit palettization (coremltools) in [nllb200_coreml_colab_v3_fixed.ipynb](local iOS project (private)). One palettized variant is built for all Apple devices.
License and intended use
- License: CC-BY-NC-4.0 (same as the base model).
- Intended use: Research and non-commercial use. Not for production deployment. General domain only. See the base model card for full details.
Citation
See aoiandroid/nllb200-coreml-1024 for the NLLB-200 citation.
- Task
- Translation
- Type
- m2m_100
- License
- cc-by-nc-4.0
- Languages
- multilingual
- Created
- Mar 19, 2026
- Updated
- May 17, 2026