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#     http://www.apache.org/licenses/LICENSE-2.0
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"""Swin Transformer model configuration"""

from huggingface_hub.dataclasses import strict

from ...backbone_utils import BackboneConfigMixin
from ...configuration_utils import PreTrainedConfig
from ...utils import auto_docstring


@auto_docstring(checkpoint="microsoft/swin-tiny-patch4-window7-224")
@strict
class SwinConfig(BackboneConfigMixin, PreTrainedConfig):
    r"""
    depths (`list(int)`, *optional*, defaults to `[2, 2, 6, 2]`):
        Depth of each layer in the Transformer encoder.
    num_heads (`list(int)`, *optional*, defaults to `[3, 6, 12, 24]`):
        Number of attention heads in each layer of the Transformer encoder.
    window_size (`int`, *optional*, defaults to 7):
        Size of windows.
    encoder_stride (`int`, *optional*, defaults to 32):
        Factor to increase the spatial resolution by in the decoder head for masked image modeling.

    Example:

    ```python
    >>> from transformers import SwinConfig, SwinModel

    >>> # Initializing a Swin microsoft/swin-tiny-patch4-window7-224 style configuration
    >>> configuration = SwinConfig()

    >>> # Initializing a model (with random weights) from the microsoft/swin-tiny-patch4-window7-224 style configuration
    >>> model = SwinModel(configuration)

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

    model_type = "swin"

    attribute_map = {
        "num_attention_heads": "num_heads",
        "num_hidden_layers": "num_layers",
    }

    image_size: int | list[int] | tuple[int, int] = 224
    patch_size: int | list[int] | tuple[int, int] = 4
    num_channels: int = 3
    embed_dim: int = 96
    depths: list[int] | tuple[int, ...] = (2, 2, 6, 2)
    num_heads: list[int] | tuple[int, ...] = (3, 6, 12, 24)
    window_size: int = 7
    mlp_ratio: float | int = 4.0
    qkv_bias: bool = True
    hidden_dropout_prob: float | int = 0.0
    attention_probs_dropout_prob: float | int = 0.0
    drop_path_rate: float | int = 0.1
    hidden_act: str = "gelu"
    use_absolute_embeddings: bool = False
    initializer_range: float = 0.02
    layer_norm_eps: float = 1e-5
    encoder_stride: int = 32
    _out_features: list[str] | None = None
    _out_indices: list[int] | None = None

    def __post_init__(self, **kwargs):
        self.num_layers = len(self.depths)
        # we set the hidden_size attribute in order to make Swin work with VisionEncoderDecoderModel
        # this indicates the channel dimension after the last stage of the model
        self.hidden_size = int(self.embed_dim * 2 ** (len(self.depths) - 1))
        self.stage_names = ["stem"] + [f"stage{idx}" for idx in range(1, len(self.depths) + 1)]
        self.set_output_features_output_indices(
            out_indices=kwargs.pop("out_indices", None), out_features=kwargs.pop("out_features", None)
        )
        super().__post_init__(**kwargs)


__all__ = ["SwinConfig"]