configuration_nemotron_labs_diffusion.py

# coding=utf-8
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"""Nemotron-Labs Diffusion model configuration"""

from transformers.configuration_utils import PretrainedConfig
from transformers.modeling_rope_utils import rope_config_validation
from transformers.utils import logging


logger = logging.get_logger(__name__)


class NemotronLabsDiffusionConfig(PretrainedConfig):
    r"""
    This is the configuration class to store the configuration of a [`NemotronLabsDiffusionModel`] for diffusion language models.
    It is used to instantiate a NemotronLabsDiffusionModel according to the specified arguments, defining the model architecture.

    Configuration objects inherit from [`PretrainedConfig`] and can be used to control the model outputs. Read the
    documentation from [`PretrainedConfig`] for more information.

    Args:
        vocab_size (`int`, *optional*, defaults to 131072):
            Vocabulary size of the Ministral model.
        hidden_size (`int`, *optional*, defaults to 4096):
            Dimension of the hidden representations.
        intermediate_size (`int`, *optional*, defaults to 14336):
            Dimension of the MLP representations.
        num_hidden_layers (`int`, *optional*, defaults to 34):
            Number of hidden layers in the Transformer decoder.
        num_attention_heads (`int`, *optional*, defaults to 32):
            Number of attention heads for each attention layer.
        num_key_value_heads (`int`, *optional*, defaults to 8):
            Number of key_value heads for Grouped Query Attention.
        head_dim (`int`, *optional*, defaults to 128):
            The attention head dimension.
        hidden_act (`str` or `function`, *optional*, defaults to `"silu"`):
            The non-linear activation function.
        max_position_embeddings (`int`, *optional*, defaults to 262144):
            The maximum sequence length.
        initializer_range (`float`, *optional*, defaults to 0.02):
            The standard deviation of the truncated_normal_initializer.
        rms_norm_eps (`float`, *optional*, defaults to 1e-05):
            The epsilon used by the rms normalization layers.
        use_cache (`bool`, *optional*, defaults to `True`):
            Whether or not the model should return the last key/values attentions.
        tie_word_embeddings (`bool`, *optional*, defaults to `False`):
            Whether the model's input and output word embeddings should be tied.
        rope_theta (`float`, *optional*, defaults to 1000000.0):
            The base period of the RoPE embeddings.
        rope_parameters (`Dict`, *optional*):
            Dictionary containing the scaling configuration for the RoPE embeddings.
            Default uses YaRN scaling with factor=16, original_max_position_embeddings=16384.
        attention_bias (`bool`, defaults to `False`):
            Whether to use a bias in the query, key, value and output projection layers.
        attention_dropout (`float`, *optional*, defaults to 0.0):
            The dropout ratio for the attention probabilities.
        mlp_bias (`bool`, *optional*, defaults to `False`):
            Whether to use a bias in up_proj, down_proj and gate_proj layers.
        sliding_window (`int`, *optional*, defaults to None):
            Sliding window attention size.
        mask_token_id (`int`, *optional*, defaults to -1):
            Token ID for masking in diffusion.
        dlm_paradigm (`str`, *optional*, defaults to 'bidirectional'):
            Paradigm for diffusion ('bidirectional', 'autoregressive', 'block_diff').
        block_size (`int`, *optional*, defaults to 32):
            Block size for block diffusion paradigms.
        dlm_loss_weight (`float`, *optional*):
            Weight for diffusion LM loss.
        ar_loss_weight (`float`, *optional*, defaults to 1.0):
            Weight for autoregressive loss in block_diff paradigm. Use 10000 to only use AR loss.
        dp_varying_mask_ratio (`bool`, *optional*, defaults to False):
            Whether to use varying mask ratio for each DP rank during sampling.
    """

    model_type = "nemotron_labs_diffusion"
    keys_to_ignore_at_inference = ["past_key_values"]

    # Default tensor parallel plan for base model `Ministral`
    base_model_tp_plan = {
        "layers.*.self_attn.q_proj": "colwise",
        "layers.*.self_attn.k_proj": "colwise",
        "layers.*.self_attn.v_proj": "colwise",
        "layers.*.self_attn.o_proj": "rowwise",
        "layers.*.mlp.gate_proj": "colwise",
        "layers.*.mlp.up_proj": "colwise",
        "layers.*.mlp.down_proj": "rowwise",
    }
    base_model_pp_plan = {
        "embed_tokens": (["input_ids"], ["inputs_embeds"]),
        "layers": (["hidden_states", "attention_mask"], ["hidden_states"]),
        "norm": (["hidden_states"], ["hidden_states"]),
    }

    def __init__(
        self,
        vocab_size=131072,
        hidden_size=4096,
        intermediate_size=14336,
        num_hidden_layers=34,
        num_attention_heads=32,
        num_key_value_heads=8,
        head_dim=128,
        hidden_act="silu",
        max_position_embeddings=262144,
        initializer_range=0.02,
        rms_norm_eps=1e-05,
        use_cache=True,
        pad_token_id=None,
        bos_token_id=1,
        eos_token_id=2,
        tie_word_embeddings=False,
        rope_theta=1000000.0,
        rope_parameters=None,
        attention_bias=False,
        attention_dropout=0.0,
        mlp_bias=False,
        sliding_window=None,
        attn_implementation="sdpa",
        mask_token_id=-1,
        dlm_paradigm='bidirectional',
        block_size=32,
        dlm_loss_weight=None,
        ar_loss_weight=1.0,
        dp_varying_mask_ratio=False,
        **kwargs,
    ):
        self.vocab_size = vocab_size
        self.max_position_embeddings = max_position_embeddings
        self.hidden_size = hidden_size
        self.intermediate_size = intermediate_size
        self.num_hidden_layers = num_hidden_layers
        self.num_attention_heads = num_attention_heads

        # for backward compatibility
        if num_key_value_heads is None:
            num_key_value_heads = num_attention_heads

        self.num_key_value_heads = num_key_value_heads
        self.head_dim = head_dim
        self.hidden_act = hidden_act
        self.initializer_range = initializer_range
        self.rms_norm_eps = rms_norm_eps
        self.use_cache = use_cache
        self.rope_parameters = rope_parameters
        # `rope_theta` is read at the top level by transformers v4.55's yarn impl; mirror from rope_parameters when present.
        self.rope_theta = (rope_parameters or {}).get("rope_theta", rope_theta)
        # v4.55 reads rope params from `rope_scaling`; in v5.0 `rope_scaling` is a property alias for rope_parameters.
        self.rope_scaling = rope_parameters
        self.attention_bias = attention_bias
        self.attention_dropout = attention_dropout
        self.mlp_bias = mlp_bias
        self.sliding_window = sliding_window
        
        rope_config_validation(self)
        
        self.attn_implementation = attn_implementation
        
        self.mask_token_id = mask_token_id
        self.dlm_paradigm = dlm_paradigm
        self.block_size = block_size
        self.dlm_loss_weight = dlm_loss_weight
        self.ar_loss_weight = ar_loss_weight
        self.dp_varying_mask_ratio = dp_varying_mask_ratio
        super().__init__(
            pad_token_id=pad_token_id,
            bos_token_id=bos_token_id,
            eos_token_id=eos_token_id,
            tie_word_embeddings=tie_word_embeddings,
            **kwargs,
        )


__all__ = ["NemotronLabsDiffusionConfig"]