configuration_mage_vit.py

try:  # transformers >= 5
    from transformers.configuration_utils import PreTrainedConfig
except ImportError:  # transformers < 5
    from transformers.configuration_utils import PretrainedConfig as PreTrainedConfig

from transformers.utils import logging


logger = logging.get_logger(__name__)


class MageViTConfig(PreTrainedConfig):
    r"""
    This is the configuration class to store the configuration of a [`MageViTModel`]. It is used to instantiate a
    Mage-ViT 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 Mage-ViT architecture.

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

    Args:
        hidden_size (`int`, *optional*, defaults to 1024):
            Dimensionality of the encoder layers and the pooler layer.
        intermediate_size (`int`, *optional*, defaults to 4096):
            Dimensionality of the "intermediate" (i.e., feed-forward) layer in the Transformer encoder.
        num_hidden_layers (`int`, *optional*, defaults to 24):
            Number of hidden layers in the Transformer encoder.
        num_attention_heads (`int`, *optional*, defaults to 16):
            Number of attention heads for each attention layer in the Transformer encoder.
        num_channels (`int`, *optional*, defaults to 3):
            The number of input channels.
        image_size (`int`, *optional*, defaults to 256):
            The size (resolution) of each image.
        patch_size (`int`, *optional*, defaults to 16):
            The size (resolution) of each patch.
        hidden_act (`str` or `function`, *optional*, defaults to `"gelu"`):
            The non-linear activation function (function or string) in the encoder and pooler.
        layer_norm_eps (`float`, *optional*, defaults to 1e-6):
            The epsilon used by the layer normalization layers.
        layer_norm_type (`str`, *optional*, defaults to `"layer_norm"`):
            The type of layer normalization to use. Supported values: `"layer_norm"`, `"rms_norm"`.
        attention_dropout (`float`, *optional*, defaults to 0.0):
            The dropout ratio for the attention probabilities.
        initializer_range (`float`, *optional*, defaults to 0.02):
            The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
        rope_theta (`float`, *optional*, defaults to 10000.0):
            The base period of the RoPE embeddings.
        rope_temporal_size (`int` or `None`, *optional*, defaults to 64):
            Fixed temporal grid size used to build RoPE positions when a 5D video tensor is passed without explicit
            `patch_positions`. Set to `None` to use the actual number of frames.
        use_head (`bool`, *optional*, defaults to `True`):
            Whether to use the multi-head attention pooling head.

    Example:

    ```python
    >>> from configuration_mage_vit import MageViTConfig
    >>> from modeling_mage_vit import MageViTModel

    >>> # Initializing a Mage-ViT configuration
    >>> configuration = MageViTConfig()

    >>> # Initializing a model (with random weights) from the configuration
    >>> model = MageViTModel(configuration)

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

    model_type = "mage_vit"

    def __init__(
        self,
        hidden_size=1024,
        intermediate_size=4096,
        num_hidden_layers=24,
        num_attention_heads=16,
        num_channels=3,
        image_size=256,
        patch_size=16,
        hidden_act="gelu",
        layer_norm_eps=1e-6,
        layer_norm_type="layer_norm",
        attention_dropout=0.0,
        initializer_range=0.02,
        rope_theta=10000.0,
        rope_temporal_size=64,
        use_head=True,
        **kwargs,
    ):
        super().__init__(**kwargs)
        self.hidden_size = hidden_size
        self.intermediate_size = intermediate_size
        self.num_hidden_layers = num_hidden_layers
        self.num_attention_heads = num_attention_heads
        self.num_channels = num_channels
        self.image_size = image_size
        self.patch_size = patch_size
        self.hidden_act = hidden_act
        self.layer_norm_eps = layer_norm_eps
        self.layer_norm_type = layer_norm_type
        self.attention_dropout = attention_dropout
        self.initializer_range = initializer_range
        self.rope_theta = rope_theta
        self.rope_temporal_size = rope_temporal_size  # None=use actual frames, int=fixed size (legacy: 64)
        self.use_head = use_head


__all__ = ["MageViTConfig"]