class_docstr: Swin Transformer Block.
  
  Args:
      dim (int): Number of input channels.
      num_heads (int): Number of attention heads.
      window_size (int): Window size.
      shift_size (int): Shift size for SW-MSA.
      mlp_ratio (float): Ratio of mlp hidden dim to embedding dim.
      qkv_bias (bool, optional): If True, add a learnable bias to query, key, value. Default: True
      qk_scale (float | None, optional): Override default qk scale of head_dim ** -0.5 if set.
      drop (float, optional): Dropout rate. Default: 0.0
      attn_drop (float, optional): Attention dropout rate. Default: 0.0
      drop_path (float, optional): Stochastic depth rate. Default: 0.0
      act_layer (nn.Module, optional): Activation layer. Default: nn.GELU
      norm_layer (nn.Module, optional): Normalization layer.  Default: nn.LayerNorm
class_docstr_tok: ["Swin","Transformer","Block",".","Args",":","dim","(","int",")",":","Number","of","input","channels",".","num_heads","(","int",")",":","Number","of","attention","heads",".","window_size","(","int",")",":","Window","size",".","shift_size","(","int",")",":","Shift","size","for","SW-MSA",".","mlp_ratio","(","float",")",":","Ratio","of","mlp","hidden","dim","to","embedding","dim",".","qkv_bias","(","bool",",","optional",")",":","If","True",",","add","a","learnable","bias","to","query",",","key",",","value",".","Default",":","True","qk_scale","(","float","|","None",",","optional",")",":","Override","default","qk","scale","of","head_dim","*","*","-0.5","if","set",".","drop","(","float",",","optional",")",":","Dropout","rate",".","Default",":","0.0","attn_drop","(","float",",","optional",")",":","Attention","dropout","rate",".","Default",":","0.0","drop_path","(","float",",","optional",")",":","Stochastic","depth","rate",".","Default",":","0.0","act_layer","(","nn.Module",",","optional",")",":","Activation","layer",".","Default",":","nn.GELU","norm_layer","(","nn.Module",",","optional",")",":","Normalization","layer",".","Default",":","nn.LayerNorm"]
code: def __init__(
      self,
      dim,
      num_heads,
      window_size=7,
      shift_size=0,
      mlp_ratio=4.0,
      qkv_bias=True,
      qk_scale=None,
      drop=0.0,
      attn_drop=0.0,
      drop_path=0.0,
      act_layer=nn.GELU,
      norm_layer=nn.LayerNorm,
  ):
      super().__init__()
      self.dim = dim
      self.num_heads = num_heads
      self.window_size = window_size
      self.shift_size = shift_size
      self.mlp_ratio = mlp_ratio
      assert (
          0 <= self.shift_size < self.window_size
      ), "shift_size must in 0-window_size"
  
      self.norm1 = norm_layer(dim)
      self.attn = WindowAttention(
          dim,
          window_size=to_2tuple(self.window_size),
          num_heads=num_heads,
          qkv_bias=qkv_bias,
          qk_scale=qk_scale,
          attn_drop=attn_drop,
          proj_drop=drop,
      )
  
      self.drop_path = (
          DropPath(drop_path) if drop_path > 0.0 else nn.Identity()
      )
      self.norm2 = norm_layer(dim)
      mlp_hidden_dim = int(dim * mlp_ratio)
      self.mlp = Mlp(
          in_features=dim,
          hidden_features=mlp_hidden_dim,
          act_layer=act_layer,
          drop=drop,
      )
  
      self.H = None
      self.W = None
  
imports: from collections import OrderedDict
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  import torch.utils.checkpoint
  from torch import Tensor
  from .common import EncoderModule, _take, make_n_channel_input
  from ..activations import get_activation_block, ACT_GELU
  from timm.models.layers import DropPath, to_2tuple, trunc_normal_
label_desc: Use image node_id 1 to create a new SwinTransformerBlock object from inherited base classes: nn with example: obj = SwinTransformerBlock(dim, num_heads, window_size, shift_size, mlp_ratio, qkv_bias, qk_scale, drop, attn_drop, drop_path, act_layer, norm_layer)