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This model was contributed to Hugging Face Transformers on 2026-08-09.

MuseGlimmerAssistant

MuseGlimmerAssistant is the DFlash drafter for MuseGlimmer. It is not a standalone language model. It has 5 sliding window layers and no embeddings of its own. It borrows the main model’s input and output embeddings, and reads the main model’s hidden states at target_layer_ids (layers 1, 13, 25, 37, and 49 by default) as context.

Rather than drafting one token at a time, the drafter denoises a whole block of block_size masked tokens in a single forward pass, like a diffusion window. The main model then verifies the block in one step. Meta reports 3.1x faster decoding on an RTX 5090 and 1.5-1.8x on Apple M-series chips.

Pass the drafter to generate() as assistant_model and set speculation_type="dflash". The drafter must be loaded in the same dtype and on the same device as the main model.

from transformers import AutoProcessor, MuseGlimmerAssistantModel, MuseGlimmerForConditionalGeneration

processor = AutoProcessor.from_pretrained("meta-models/Muse-Glimmer-30B")
model = MuseGlimmerForConditionalGeneration.from_pretrained(
    "meta-models/Muse-Glimmer-30B",
    device_map="auto",
)
drafter = MuseGlimmerAssistantModel.from_pretrained(
    "meta-models/Muse-Glimmer-30B-assistant",
    device_map="auto",
)

messages = [
    {
        "role": "user",
        "content": [{"type": "text", "text": "Write a bash one-liner that counts lines of Python in a repo."}],
    },
]
inputs = processor.apply_chat_template(
    messages,
    add_generation_prompt=True,
    tokenize=True,
    return_dict=True,
    return_tensors="pt",
).to(model.device)
input_len = inputs["input_ids"].shape[-1]

outputs = model.generate(
    **inputs,
    assistant_model=drafter,
    speculation_type="dflash",
    max_new_tokens=256,
)
response = processor.decode(outputs[0][input_len:], skip_special_tokens=False)
print(response)

Notes

The drafter needs the main model’s hidden states, so generate forces output_hidden_states=True for the target model when speculation_type="dflash".
See the Meta is back with Muse Glimmer: local, agentic, multimodal, and open source! blog post for more details and example usage.

MuseGlimmerAssistantConfig

class transformers.MuseGlimmerAssistantConfig

< source >

( transformers_version: str | None = Nonearchitectures: list[str] | None = Noneoutput_hidden_states: bool | None = Falsereturn_dict: bool | None = Truedtype: typing.Union[str, ForwardRef('torch.dtype'), NoneType] = Nonechunk_size_feed_forward: int = 0is_encoder_decoder: bool = Falseid2label: dict[int, str] | dict[str, str] | None = Nonelabel2id: dict[str, int] | dict[str, str] | None = Noneproblem_type: typing.Optional[typing.Literal['regression', 'single_label_classification', 'multi_label_classification']] = Nonehidden_size: int = 6656intermediate_size: int = 19968num_hidden_layers: int = 5num_attention_heads: int = 32num_key_value_heads: int = 8head_dim: int = 128rms_norm_eps: float = 1e-05rope_parameters: dict | None = Nonemax_position_embeddings: int = 131072sliding_window: int = 2048layer_types: list[str] | None = Noneattention_dropout: float | int = 0hidden_act: str = 'silu'bos_token_id: int | None = 200000eos_token_id: int | None = 200001pad_token_id: int | None = 200018block_size: int = 16mask_token_id: int = 201818target_layer_ids: list[int] | None = None )

Parameters

hidden_size (int, optional, defaults to 6656) — Dimension of the hidden representations.
intermediate_size (int, optional, defaults to 19968) — Dimension of the MLP representations.
num_hidden_layers (int, optional, defaults to 5) — Number of hidden layers in the Transformer decoder.
num_attention_heads (int, optional, defaults to 32) — Number of attention heads for each attention layer in the Transformer decoder.
num_key_value_heads (int, optional, defaults to 8) — This is the number of key_value heads that should be used to implement Grouped Query Attention. If num_key_value_heads=num_attention_heads, the model will use Multi Head Attention (MHA), if num_key_value_heads=1 the model will use Multi Query Attention (MQA) otherwise GQA is used. When converting a multi-head checkpoint to a GQA checkpoint, each group key and value head should be constructed by meanpooling all the original heads within that group. For more details, check out this paper. If it is not specified, will default to num_attention_heads.
head_dim (int, optional, defaults to 128) — The attention head dimension. If None, it will default to hidden_size // num_attention_heads
rms_norm_eps (float, optional, defaults to 1e-05) — The epsilon used by the rms normalization layers.
rope_parameters (dict, optional) — Dictionary containing the configuration parameters for the RoPE embeddings. The dictionary should contain a value for rope_theta and optionally parameters used for scaling in case you want to use RoPE with longer max_position_embeddings.
max_position_embeddings (int, optional, defaults to 131072) — The maximum sequence length that this model might ever be used with.
sliding_window (int, optional, defaults to 2048) — Sliding window attention window size. If None, no sliding window is applied.
layer_types (list[str], optional) — A list that explicitly maps each layer index with its layer type. If not provided, it will be automatically generated based on config values.
attention_dropout (Union[float, int], optional, defaults to 0) — The dropout ratio for the attention probabilities.
hidden_act (str, optional, defaults to silu) — The non-linear activation function (function or string) in the decoder. For example, "gelu", "relu", "silu", etc.
bos_token_id (int, optional, defaults to 200000) — Token id used for beginning-of-stream in the vocabulary.
eos_token_id (int, optional, defaults to 200001) — Token id used for end-of-stream in the vocabulary.
pad_token_id (int, optional, defaults to 200018) — Token id used for padding in the vocabulary.
block_size (int, optional) — The block size of noise inputs that will be denoised.
mask_token_id (int, optional) — Mask token ids used as noisey input to model.
target_layer_ids (list[int], optional) — Zero indexed layer ids whose hidden states are concatenated as context for the model.

This is the configuration class to store the configuration of a MuseGlimmerAssistantModel. It is used to instantiate a Muse Glimmer Assistant model according to the specified arguments, defining the model architecture. Instantiating a configuration with the defaults will yield a similar configuration to that of the meta-models/Muse-Glimmer-30B-assistant

Configuration objects inherit from PreTrainedConfig and can be used to control the model outputs. Read the documentation from PreTrainedConfig for more information.

Example:

>>> from transformers import MuseGlimmerAssistantConfig, MuseGlimmerAssistantModel

>>> # Initializing a Muse Glimmer Assistant config similar to `meta-models/Muse-Glimmer-30B-assistant`.
>>> configuration = MuseGlimmerAssistantConfig(text_config)

>>> # Initializing a model from the `meta-models/Muse-Glimmer-30B-assistant` configuration.
>>> model = MuseGlimmerAssistantModel(configuration)

>>> # Accessing the model configuration
>>> configuration = model.config

MuseGlimmerAssistantPreTrainedModel

class transformers.MuseGlimmerAssistantPreTrainedModel

< source >

( config: PreTrainedConfig*inputs**kwargs )

Parameters

config (PreTrainedConfig) — Model configuration class with all the parameters of the model. Initializing with a config file does not load the weights associated with the model, only the configuration. Check out the from_pretrained() method to load the model weights.

This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads etc.)

This model is also a PyTorch torch.nn.Module subclass. Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage and behavior.

MuseGlimmerAssistantModel

class transformers.MuseGlimmerAssistantModel

< source >

( config: MuseGlimmerAssistantConfig )

Parameters

config (MuseGlimmerAssistantConfig) — Model configuration class with all the parameters of the model. Initializing with a config file does not load the weights associated with the model, only the configuration. Check out the from_pretrained() method to load the model weights.

The bare Muse Glimmer Assistant Model outputting raw hidden-states without any specific head on top.

This model is also a PyTorch torch.nn.Module subclass. Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage and behavior.

forward

< source >

( noise_embeds: FloatTensorcontext_hidden_states: FloatTensorattention_mask: typing.Optional[torch.Tensor] = Noneposition_ids: typing.Optional[torch.LongTensor] = Nonepast_key_values: transformers.cache_utils.DFlashCache | None = Noneuse_cache: bool | None = None**kwargs: Unpack )

noise_embeds (torch.FloatTensor of shape [batch_size, config.block_size, dim]): Input embedding for the last generated anchor token and mask tokens to be denoised. context_hidden_states (torch.FloatTensor of shape [batch_size, number_of_previous_accepted_tokens, dim * len(config.target_layer_ids)]): Context hidden states from target model’s selected layer ids concatenated in the last dim. attention_mask (torch.Tensor of shape [batch_size, number_of_previous_accepted_tokens + config.block_size]): Similar to the usual attention_mask, but note that it has length number_of_previous_accepted_tokens + config.block_size, because the Attention will first concatenate context_hidden_states and the hidden states derived from noise_embeds, so that k/v states do not have the same length as q_states, even before the cache.update() call. Thus the kv_seq_len dimension of the attention mask needs to span the additional positions. position_ids (torch.Tensor of shape [batch_size, number_of_previous_accepted_tokens + config.block_size]): Similar to the usual position_ids, but note that it has length number_of_previous_accepted_tokens + config.block_size, because the Attention will first concatenate context_hidden_states and the hidden states derived from noise_embeds, so that k/v states do not have the same length as q_states, even before the cache.update() call. Thus the position_ids and the derived position_embeddings need to span all the additional positions.

Update on GitHub

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