mila-llm/Llama-3.2-3B-Instruct-fp4

Llama 3.2 3B Instruct — FP4 for Mila

Built with Llama.

A pre-quantized Mila artifact of meta-llama/Llama-3.2-3B-Instruct, in safetensors format.

2.86 GiB, down from 6.72 GiB at BF16. The FP4 packing is done once here instead of on every load, so a Mila session starts near-instantly rather than quantizing 3 billion parameters first. It is the smallest instruct model Mila publishes, and it leaves most of a 12 GB card free for context.

Files

File	Purpose
llama32_3b_instruct_fp4.safetensors	Weights: packed FP4 E2M1 with per-group FP32 scales
llama32_tokenizer.bin	Mila tokenizer, shared across the Llama 3.x line
mila.json	Manifest: file digests, quantization, minimum Mila version
LICENSE	Llama 3.2 Community License Agreement
NOTICE	Attribution the license requires be retained

Use

From the Mila chat harness:

/install Llama-3.2-3B-Instruct-fp4
/model Llama-3.2-3B-Instruct-fp4

Installing is a deliberate step, and it is the only one that touches the network. It verifies each file against the digest in mila.json and leaves it in a content-addressed local store; every load afterwards reads the store and nothing else. /models --online lists what is published, and /models lists what is already installed.

From the library:

ModelStore store;

// Pull once. This is the only thing here that touches the network.
const auto hub = makeDefaultModelHub();
ModelResolver resolver( store, *hub );
resolver.pull( "Llama-3.2-3B-Instruct-fp4", std::string( kDefaultHubOwner ) );

// Load from the store thereafter -- no network, and no manifest fetch.
const auto model = store.locate( "Llama-3.2-3B-Instruct-fp4" );

The quantization travels in the name rather than in a variant suffix: one name is one model.

No token is required — this repository is public and ungated. It is redistributed under the terms below, which permit it; the base model on meta-llama is gated by Meta's own choice, not by the license.

Quantization

The transformer blocks' linear weights are FP4 E2M1, two values packed per byte, with FP32 absmax scales per group of 128 along the input axis. Scales travel as sibling tensors (<name>.weight_scale). Norms stay BF16.

The token embedding and lm_head are not quantized, and not tied — both stay BF16. On a 3B with a 128k vocabulary that is a larger share of the file than it would be on a bigger model, which is why this is roughly half the BF16 build rather than a quarter of it. Mila's Gemma chassis quantizes and ties both; the Llama chassis does not yet, so the saving is available but unclaimed.

This is Mila's own scheme, not a portable one. It is deliberately not NVFP4 (group 16, FP8 scales) or MXFP4 (group 32, UE8M0 scales), so transformers and vLLM cannot consume it. The file opens in any safetensors reader — shapes, dtypes and metadata are all inspectable — but loading it as a model requires Mila.

Modifications from the base model

• Weights quantized from BF16 to FP4 E2M1 with per-group scales
• Repacked from the HuggingFace checkpoint into Mila's tensor layout, then into safetensors
• Tokenizer converted to Mila's format
• No fine-tuning, distillation, or other change to what the model learned

Quantization is lossy. Mila publishes the quantized build because it is the one that fits the hardware Mila targets; if you need the weights untouched, convert them yourself from meta-llama/Llama-3.2-3B-Instruct with the converters in the Mila repository.

License and attribution

Llama 3.2 is licensed under the Llama 3.2 Community License, Copyright © Meta Platforms, Inc. All Rights Reserved. The full agreement is in LICENSE and the required attribution in NOTICE.

Use is subject to the Llama 3.2 Acceptable Use Policy, incorporated into the agreement by reference.

Base model: meta-llama/Llama-3.2-3B-Instruct, © Meta Platforms, Inc. This repository is not affiliated with or endorsed by Meta.

Note for anyone deriving further: Llama 3.1 and 3.2 are separate agreements with different attribution strings and different Acceptable Use Policies. A 3.1 derivative does not inherit this one — take the license that matches its base model.