---
license: mit
base_model: WeiboAI/VibeThinker-3B
base_model_relation: quantized
library_name: litert-lm
pipeline_tag: text-generation
language:
- en
tags:
- litert
- litert-lm
- tflite
- on-device
- edge
- lora
- qwen2
---

# VibeThinker-3B — LiteRT-LM

[LiteRT-LM](https://github.com/google-ai-edge/LiteRT-LM) (`.litertlm`) conversion of
[**WeiboAI/VibeThinker-3B**](https://huggingface.co/WeiboAI/VibeThinker-3B) (a Qwen2.5-3B–architecture
reasoning model) for on-device / edge inference via Google AI Edge LiteRT-LM.

## Files

| file | size | notes |
|---|---|---|
| `vibethinker3b_q8_ekv8192_lora16.litertlm` | ~3.4 GB | prefill+decode, int8 weights, 8192 ctx, **runtime-swappable LoRA (rank 16)** |

## Conversion details

- **Source:** `WeiboAI/VibeThinker-3B` (Qwen2.5-3B: 36 layers, hidden 2048, 16 heads / 2 KV groups, vocab 151936)
- **Tool:** `litert-torch` 0.9.0 generative converter (`examples.qwen.convert_to_tflite`)
- **Quantization:** `dynamic_int8` (int8 weights / fp32 activations)
- **Context / KV cache:** 8192 tokens (chosen for long reasoning traces)
- **Signatures:** `prefill_256`, `decode`, plus LoRA-enabled `prefill_256_lora_r16`, `decode_lora_r16`
- **Metadata:** model type `qwen2p5`, HF tokenizer, Qwen2.5 chat template embedded, stop tokens `<|im_end|>` (151645) / `<|endoftext|>` (151643)

> **LoRA note:** the rank-16 LoRA signatures target the q/k/v/o projections and let the
> [LiteRT-LM runtime](https://github.com/google-ai-edge/LiteRT-LM) load/swap a fine-tuned adapter at init
> (`EngineSettings::SetScopedLoraFile`). Exporting these required fixing a grouped-query-attention out-dim
> bug in `litert-torch`'s `lora.py` (reported upstream:
> [litert-torch#1066](https://github.com/google-ai-edge/litert-torch/issues/1066)).

## Usage

Run with the LiteRT-LM runtime (`litert_lm_main` / engine API):

```bash
litert_lm_main --backend=cpu --model_path=vibethinker3b_q8_ekv8192_lora16.litertlm
```

To attach a fine-tuned rank-16 LoRA adapter, convert it with `litert_torch`'s
`LoRA.from_safetensors(...).to_tflite()` and load the resulting file via the runtime's scoped-LoRA API.

## License

MIT, inherited from the base model `WeiboAI/VibeThinker-3B`.