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Model: open-machine/Llama-3.2-1B-FlashNorm-test
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---
license: llama3.2
base_model: meta-llama/Llama-3.2-1B
tags:
- flashnorm
- transformer-tricks
- efficient-inference
pipeline_tag: text-generation
---
# Llama-3.2-1B-FlashNorm
FlashNorm-prepared compatibility checkpoint of [meta-llama/Llama-3.2-1B](https://huggingface.co/meta-llama/Llama-3.2-1B), derived from Meta's original weights obtained via the [unsloth/Llama-3.2-1B](https://huggingface.co/unsloth/Llama-3.2-1B) ungated mirror (bit-identical to the upstream release).
The FlashNorm transformation is mathematically exact. This checkpoint loads in stock `transformers` and `vLLM` without any code changes.
## What is FlashNorm?
An exact reformulation of `RMSNorm → Linear` that (i) folds the per-channel normalization weights into the following linear layer (`W* = W · diag(g)`) and (ii) defers the scalar `1/RMS(x)` normalization to after the matmul. On hardware with distinct vector and matrix units, the matrix multiplication and the RMS reduction can execute in parallel.
See the [paper](https://github.com/OpenMachine-ai/transformer-tricks/blob/main/doc/flashNorm.pdf) and the [transformer-tricks](https://github.com/OpenMachine-ai/transformer-tricks) repo for details.
## What's different from the source checkpoint?
| Tensor | Source | This checkpoint |
|---|---|---|
| `model.layers.*.input_layernorm.weight` | learned per-channel `g` | all ones |
| `model.layers.*.self_attn.{q,k,v}_proj.weight` | `W` | `W · diag(g_input_layernorm)` |
| `model.layers.*.post_attention_layernorm.weight` | learned per-channel `g` | all ones |
| `model.layers.*.mlp.{gate,up}_proj.weight` | `W` | `W · diag(g_post_attention_layernorm)` |
All tensors are stored in the source dtype (`bfloat16`); the merged products are computed in float32 internally before casting back. `model.norm.weight` is unchanged (tied embeddings). Mathematical identity holds by construction.
## Usage
```python
from transformers import AutoModelForCausalLM, AutoTokenizer
tok = AutoTokenizer.from_pretrained('open-machine/Llama-3.2-1B-FlashNorm')
model = AutoModelForCausalLM.from_pretrained('open-machine/Llama-3.2-1B-FlashNorm')
ids = tok('Once upon a time there was', return_tensors='pt').input_ids
out = model.generate(ids, max_new_tokens=50, do_sample=False)
print(tok.decode(out[0], skip_special_tokens=True))
```
With vLLM:
```bash
vllm serve open-machine/Llama-3.2-1B-FlashNorm
```
## Framework behavior
The FlashNorm transformation is mathematically exact.
- **HuggingFace Transformers at fp32**: greedy generation is bit-identical to the source.
- **HuggingFace Transformers at fp16** and **vLLM** (any precision): a one-token argmax flip is possible at tight decision points; downstream greedy decoding then amplifies this. Reason: precomputed merged weights interact differently with lossy inference kernels than runtime `x·g·W` would.
This is a general property of precomputing weight-folded tensors for lossy-inference kernels, **not specific to FlashNorm**. A native fused `RMSNorm + QKV` kernel (deferring `g` to runtime) eliminates the framework dependency and is in progress for vLLM / FlashInfer.
## License
Llama 3.2 Community License, inherited from the source model.

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{
"architectures": [
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],
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"attention_dropout": 0.0,
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"head_dim": 64,
"hidden_act": "silu",
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"initializer_range": 0.02,
"intermediate_size": 8192,
"max_position_embeddings": 131072,
"mlp_bias": false,
"model_type": "llama",
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"num_hidden_layers": 16,
"num_key_value_heads": 8,
"pad_token_id": 128004,
"pretraining_tp": 1,
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"rope_theta": 500000.0,
"rope_type": "llama3"
},
"tie_word_embeddings": true,
"transformers_version": "5.5.4",
"unsloth_fixed": true,
"use_cache": true,
"vocab_size": 128256
}

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