try sep vit

main.py

@@ -478,7 +478,11 @@ class Main(object):
                 batch, 'train')
 
             pred = self.model.forward(sub, rel, neg_ent, self.p.train_strategy)
+            try:
                 loss = self.model.loss(pred, label, sub_samp)
+            except Exception as e:
+                print(pred)
+                raise e
 
             loss.backward()
             self.optimizer.step()

models.py

@@ -1,17 +1,16 @@
 import torch
-from torch import nn
+from torch import nn, einsum
 import torch.nn.functional as F
 import numpy as np
 from functools import partial
 from einops.layers.torch import Rearrange, Reduce
+from einops import rearrange, repeat
 from utils import *
 from layers import *
 from timm.data import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
 from timm.models.layers import DropPath, trunc_normal_
 from timm.models.registry import register_model
 from timm.layers.helpers import to_2tuple
-from typing import *
-import math
 
 
 class ConvE(torch.nn.Module):
@@ -528,22 +527,6 @@ class FouriER(torch.nn.Module):
 
         self.network = nn.ModuleList(network)
         self.norm = norm_layer(embed_dims[-1])
-        self.graph_type = 'Spatial'
-        N = (image_h // patch_size)**2
-        if self.graph_type in ["Spatial", "Mixed"]:
-            # Create a range tensor of node indices
-            indices = torch.arange(N)
-            # Reshape the indices tensor to create a grid of row and column indices
-            row_indices = indices.view(-1, 1).expand(-1, N)
-            col_indices = indices.view(1, -1).expand(N, -1)
-            # Compute the adjacency matrix
-            row1, col1 = row_indices // int(math.sqrt(N)), row_indices % int(math.sqrt(N))
-            row2, col2 = col_indices // int(math.sqrt(N)), col_indices % int(math.sqrt(N))
-            graph = ((abs(row1 - row2) <= 1).float() * (abs(col1 - col2) <= 1).float())
-            graph = graph - torch.eye(N)
-            self.spatial_graph = graph.cuda() # comment .to("cuda") if the environment is cpu
-        self.class_token = False
-        self.token_scale = False
         self.head = nn.Linear(
                 embed_dims[-1], num_classes) if num_classes > 0 \
                 else nn.Identity()
@@ -561,44 +544,7 @@ class FouriER(torch.nn.Module):
 
     def forward_tokens(self, x):
         outs = []
-        B, C, H, W = x.shape
-        N = H*W
-        if self.graph_type in ["Semantic", "Mixed"]:
-            # Generate the semantic graph w.r.t. the cosine similarity between tokens
-            # Compute cosine similarity
-            if self.class_token:
-                x_normed = x[:, 1:] / x[:, 1:].norm(dim=-1, keepdim=True)
-            else:
-                x_normed = x / x.norm(dim=-1, keepdim=True)
-            x_cossim = x_normed @ x_normed.transpose(-1, -2)
-            threshold = torch.kthvalue(x_cossim, N-1-self.num_neighbours, dim=-1, keepdim=True)[0] # B,H,1,1 
-            semantic_graph = torch.where(x_cossim>=threshold, 1.0, 0.0)
-            if self.class_token:
-                semantic_graph = semantic_graph - torch.eye(N-1, device=semantic_graph.device).unsqueeze(0)
-            else:
-                semantic_graph = semantic_graph - torch.eye(N, device=semantic_graph.device).unsqueeze(0)
-        
-        if self.graph_type == "None":
-            graph = None
-        else:
-            if self.graph_type == "Spatial":
-                graph = self.spatial_graph.unsqueeze(0).expand(B,-1,-1)#.to(x.device)
-            elif self.graph_type == "Semantic":
-                graph = semantic_graph
-            elif self.graph_type == "Mixed":
-                # Integrate the spatial graph and semantic graph
-                spatial_graph = self.spatial_graph.unsqueeze(0).expand(B,-1,-1).to(x.device)
-                graph = torch.bitwise_or(semantic_graph.int(), spatial_graph.int()).float()
-            
-            # Symmetrically normalize the graph
-            degree = graph.sum(-1) # B, N
-            degree = torch.diag_embed(degree**(-1/2))
-            graph = degree @ graph @ degree
-
         for idx, block in enumerate(self.network):
-            try:
-                x = block(x, graph)
-            except:
             x = block(x)
         # output only the features of last layer for image classification
         return x
@@ -612,6 +558,8 @@ class FouriER(torch.nn.Module):
         z = self.forward_embeddings(y)
         z = self.forward_tokens(z)
         z = z.mean([-2, -1])
+        if np.count_nonzero(np.isnan(z)) > 0:
+            print("ZZZ")
         z = self.norm(z)
         x = self.head(z)
         x = self.hidden_drop(x)
@@ -758,7 +706,7 @@ def basic_blocks(dim, index, layers,
             use_layer_scale=use_layer_scale, 
             layer_scale_init_value=layer_scale_init_value, 
             ))
-    blocks = SeqModel(*blocks)
+    blocks = nn.Sequential(*blocks)
 
     return blocks
 
@@ -923,278 +871,202 @@ def window_reverse(windows, window_size, H, W):
     x = x.permute(0, 1, 3, 2, 4, 5).contiguous().view(B, -1, H, W)
     return x
 
-class SeqModel(nn.Sequential):
+def cast_tuple(val, length = 1):
-	def forward(self, *inputs):
+    return val if isinstance(val, tuple) else ((val,) * length)
-		for module in self._modules.values():
-			if type(inputs) == tuple:
-				inputs = module(*inputs)
-			else:
-				inputs = module(inputs)
-		return inputs
 
-def propagate(x: torch.Tensor, weight: torch.Tensor, 
+# helper classes
-              index_kept: torch.Tensor, index_prop: torch.Tensor, 
+
-              standard: str = "None", alpha: Optional[float] = 0, 
+class ChanLayerNorm(nn.Module):
-              token_scales: Optional[torch.Tensor] = None,
+    def __init__(self, dim, eps = 1e-5):
-              cls_token=True):
+        super().__init__()
+        self.eps = eps
+        self.g = nn.Parameter(torch.ones(1, dim, 1, 1))
+        self.b = nn.Parameter(torch.zeros(1, dim, 1, 1))
+
+    def forward(self, x):
+        var = torch.var(x, dim = 1, unbiased = False, keepdim = True)
+        mean = torch.mean(x, dim = 1, keepdim = True)
+        return (x - mean) / (var + self.eps).sqrt() * self.g + self.b
+
+class OverlappingPatchEmbed(nn.Module):
+    def __init__(self, dim_in, dim_out, stride = 2):
+        super().__init__()
+        kernel_size = stride * 2 - 1
+        padding = kernel_size // 2
+        self.conv = nn.Conv2d(dim_in, dim_out, kernel_size, stride = stride, padding = padding)
+
+    def forward(self, x):
+        return self.conv(x)
+
+class PEG(nn.Module):
+    def __init__(self, dim, kernel_size = 3):
+        super().__init__()
+        self.proj = nn.Conv2d(dim, dim, kernel_size = kernel_size, padding = kernel_size // 2, groups = dim, stride = 1)
+
+    def forward(self, x):
+        return self.proj(x) + x
+
+# feedforward
+
+class FeedForwardDSSA(nn.Module):
+    def __init__(self, dim, mult = 4, dropout = 0.):
+        super().__init__()
+        inner_dim = int(dim * mult)
+        self.net = nn.Sequential(
+            ChanLayerNorm(dim),
+            nn.Conv2d(dim, inner_dim, 1),
+            nn.GELU(),
+            nn.Dropout(dropout),
+            nn.Conv2d(inner_dim, dim, 1),
+            nn.Dropout(dropout)
+        )
+    def forward(self, x):
+        return self.net(x)
+
+# attention
+
+class DSSA(nn.Module):
+    def __init__(
+        self,
+        dim,
+        heads = 8,
+        dim_head = 32,
+        dropout = 0.,
+        window_size = 7
+    ):
+        super().__init__()
+        self.heads = heads
+        self.scale = dim_head ** -0.5
+        self.window_size = window_size
+        inner_dim = dim_head * heads
+
+        self.norm = ChanLayerNorm(dim)
+
+        self.attend = nn.Sequential(
+            nn.Softmax(dim = -1),
+            nn.Dropout(dropout)
+        )
+
+        self.to_qkv = nn.Conv1d(dim, inner_dim * 3, 1, bias = False)
+
+        # window tokens
+
+        self.window_tokens = nn.Parameter(torch.randn(dim))
+
+        # prenorm and non-linearity for window tokens
+        # then projection to queries and keys for window tokens
+
+        self.window_tokens_to_qk = nn.Sequential(
+            nn.LayerNorm(dim_head),
+            nn.GELU(),
+            Rearrange('b h n c -> b (h c) n'),
+            nn.Conv1d(inner_dim, inner_dim * 2, 1),
+            Rearrange('b (h c) n -> b h n c', h = heads),
+        )
+
+        # window attention
+
+        self.window_attend = nn.Sequential(
+            nn.Softmax(dim = -1),
+            nn.Dropout(dropout)
+        )
+
+        self.to_out = nn.Sequential(
+            nn.Conv2d(inner_dim, dim, 1),
+            nn.Dropout(dropout)
+        )
+
+    def forward(self, x):
         """
-    Propagate tokens based on the selection results.
+        einstein notation
-    ================================================
-    Args:
-        - x: Tensor([B, N, C]): the feature map of N tokens, including the [CLS] token.
 
-        - weight: Tensor([B, N-1, N-1]): the weight of each token propagated to the other tokens, 
+        b - batch
-                                         excluding the [CLS] token. weight could be a pre-defined 
+        c - channels
-                                         graph of the current feature map (by default) or the
+        w1 - window size (height)
-                                         attention map (need to manually modify the Block Module).
+        w2 - also window size (width)
-                                         
+        i - sequence dimension (source)
-        - index_kept: Tensor([B, N-1-num_prop]): the index of kept image tokens in the feature map X
+        j - sequence dimension (target dimension to be reduced)
-        
+        h - heads
-        - index_prop: Tensor([B, num_prop]): the index of propagated image tokens in the feature map X
+        x - height of feature map divided by window size
-        
+        y - width of feature map divided by window size
-        - standard: str: the method applied to propagate the tokens, including "None", "Mean" and 
-                         "GraphProp"
-        
-        - alpha: float: the coefficient of propagated features
-        
-        - token_scales: Tensor([B, N]): the scale of tokens, including the [CLS] token. token_scales
-                                        is None by default. If it is not None, then token_scales 
-                                        represents the scales of each token and should sum up to N.
-        
-    Return:
-        - x: Tensor([B, N-1-num_prop, C]): the feature map after propagation
-        
-        - weight: Tensor([B, N-1-num_prop, N-1-num_prop]): the graph of feature map after propagation
-        
-        - token_scales: Tensor([B, N-1-num_prop]): the scale of tokens after propagation
         """
 
-    B, N, C = x.shape
+        batch, height, width, heads, wsz = x.shape[0], *x.shape[-2:], self.heads, self.window_size
+        assert (height % wsz) == 0 and (width % wsz) == 0, f'height {height} and width {width} must be divisible by window size {wsz}'
+        num_windows = (height // wsz) * (width // wsz)
 
-    # Step 1: divide tokens
+        x = self.norm(x)
-    if cls_token:
-        x_cls = x[:, 0:1] # B, 1, C
-    x_kept = x.gather(dim=1, index=index_kept.unsqueeze(-1).expand(-1,-1,C)) # B, N-1-num_prop, C
-    x_prop = x.gather(dim=1, index=index_prop.unsqueeze(-1).expand(-1,-1,C)) # B, num_prop, C
 
-    # Step 2: divide token_scales if it is not None
+        # fold in windows for "depthwise" attention - not sure why it is named depthwise when it is just "windowed" attention
-    if token_scales is not None:
-        if cls_token:
-            token_scales_cls = token_scales[:, 0:1] # B, 1
-        token_scales_kept = token_scales.gather(dim=1, index=index_kept) # B, N-1-num_prop
-        token_scales_prop = token_scales.gather(dim=1, index=index_prop) # B, num_prop
 
-    # Step 3: propagate tokens
+        x = rearrange(x, 'b c (h w1) (w w2) -> (b h w) c (w1 w2)', w1 = wsz, w2 = wsz)
-    if standard == "None":
-        """
-        No further propagation
-        """
-        pass
 
-    elif standard == "Mean":
+        # add windowing tokens
-        """
-        Calculate the mean of all the propagated tokens,
-        and concatenate the result token back to kept tokens.
-        """
-        # naive average
-        x_prop = x_prop.mean(1, keepdim=True) # B, 1, C
-        # Concatenate the average token 
-        x_kept = torch.cat((x_kept, x_prop), dim=1) # B, N-num_prop, C
 
-    elif standard == "GraphProp":
+        w = repeat(self.window_tokens, 'c -> b c 1', b = x.shape[0])
-        """
+        x = torch.cat((w, x), dim = -1)
-        Propagate all the propagated token to kept token
-        with respect to the weights and token scales.
-        """
-        assert weight is not None, "The graph weight is needed for graph propagation"
 
-        # Step 3.1: divide propagation weights.
+        # project for queries, keys, value
-        if cls_token:
-            index_kept = index_kept - 1 # since weights do not include the [CLS] token
-            index_prop = index_prop - 1 # since weights do not include the [CLS] token
-            weight = weight.gather(dim=1, index=index_kept.unsqueeze(-1).expand(-1,-1,N-1)) # B, N-1-num_prop, N-1
-            weight_prop = weight.gather(dim=2, index=index_prop.unsqueeze(1).expand(-1,weight.shape[1],-1)) # B, N-1-num_prop, num_prop
-            weight = weight.gather(dim=2, index=index_kept.unsqueeze(1).expand(-1,weight.shape[1],-1)) # B, N-1-num_prop, N-1-num_prop
-        else:
-            weight = weight.gather(dim=1, index=index_kept.unsqueeze(-1).expand(-1,-1,N)) # B, N-1-num_prop, N-1
-            weight_prop = weight.gather(dim=2, index=index_prop.unsqueeze(1).expand(-1,weight.shape[1],-1)) # B, N-1-num_prop, num_prop
-            weight = weight.gather(dim=2, index=index_kept.unsqueeze(1).expand(-1,weight.shape[1],-1)) # B, N-1-num_prop, N-1-num_prop
 
-        # Step 3.2: generate the broadcast message and propagate the message to corresponding kept tokens
+        q, k, v = self.to_qkv(x).chunk(3, dim = 1)
-        # Simple implementation
-        x_prop = weight_prop @ x_prop # B, N-1-num_prop, C
-        x_kept = x_kept + alpha * x_prop # B, N-1-num_prop, C
 
-        """ scatter_reduce implementation for batched inputs
+        # split out heads
-        # Get the non-zero values
-        non_zero_indices = torch.nonzero(weight_prop, as_tuple=True)
-        non_zero_values = weight_prop[non_zero_indices]
 
-        # Sparse multiplication
+        q, k, v = map(lambda t: rearrange(t, 'b (h d) ... -> b h (...) d', h = heads), (q, k, v))
-        batch_indices, row_indices, col_indices = non_zero_indices
-        sparse_matmul = alpha * non_zero_values[:, None] * x_prop[batch_indices, col_indices, :]
-        reduce_indices = batch_indices * x_kept.shape[1] + row_indices
 
-        x_kept = x_kept.reshape(-1, C).scatter_reduce(dim=0, 
+        # scale
-                                                      index=reduce_indices[:, None], 
-                                                      src=sparse_matmul, 
-                                                      reduce="sum",
-                                                      include_self=True)
-        x_kept = x_kept.reshape(B, -1, C)
-        """
 
-        # Step 3.3: calculate the scale of each token if token_scales is not None
+        q = q * self.scale
-        if token_scales is not None:
-            if cls_token:
-                token_scales_cls = token_scales[:, 0:1] # B, 1
-                token_scales = token_scales[:, 1:]
-            token_scales_kept = token_scales.gather(dim=1, index=index_kept) # B, N-1-num_prop
-            token_scales_prop = token_scales.gather(dim=1, index=index_prop) # B, num_prop
-            token_scales_prop = weight_prop @ token_scales_prop.unsqueeze(-1) # B, N-1-num_prop, 1
-            token_scales = token_scales_kept + alpha * token_scales_prop.squeeze(-1) # B, N-1-num_prop
-            if cls_token:
-                token_scales = torch.cat((token_scales_cls, token_scales), dim=1) # B, N-num_prop
-    else:
-        assert False, "Propagation method \'%f\' has not been supported yet." % standard
 
+        # similarity
 
-    if cls_token:
+        dots = einsum('b h i d, b h j d -> b h i j', q, k)
-        # Step 4： concatenate the [CLS] token and generate returned value
-        x = torch.cat((x_cls, x_kept), dim=1) # B, N-num_prop, C
-    else:
-        x = x_kept
-    return x, weight, token_scales
 
+        # attention
 
+        attn = self.attend(dots)
 
-def select(weight: torch.Tensor, standard: str = "None", num_prop: int = 0, cls_token = True):
+        # aggregate values
-    """
-    Select image tokens to be propagated. The [CLS] token will be ignored. 
-    ======================================================================
-    Args:
-        - weight: Tensor([B, H, N, N]): used for selecting the kept tokens. Only support the
-                                        attention map of tokens at the moment.
 
-        - standard: str: the method applied to select the tokens
+        out = torch.matmul(attn, v)
 
-        - num_prop: int: the number of tokens to be propagated
+        # split out windowed tokens
 
-    Return:
+        window_tokens, windowed_fmaps = out[:, :, 0], out[:, :, 1:]
-        - index_kept: Tensor([B, N-1-num_prop]): the index of kept tokens 
 
-        - index_prop: Tensor([B, num_prop]): the index of propagated tokens
+        # early return if there is only 1 window
-    """
 
-    assert len(weight.shape) == 4, "Selection methods on tensors other than the attention map haven't been supported yet."
+        if num_windows == 1:
-    B, H, N1, N2 = weight.shape
+            fmap = rearrange(windowed_fmaps, '(b x y) h (w1 w2) d -> b (h d) (x w1) (y w2)', x = height // wsz, y = width // wsz, w1 = wsz, w2 = wsz)
-    assert N1 == N2, "Selection methods on tensors other than the attention map haven't been supported yet."
+            return self.to_out(fmap)
-    N = N1
-    assert num_prop >= 0, "The number of propagated/pruned tokens must be non-negative."
 
-    if cls_token:
+        # carry out the pointwise attention, the main novelty in the paper
-        if standard == "CLSAttnMean":
-            token_rank = weight[:,:,0,1:].mean(1)
 
-        elif standard == "CLSAttnMax":
+        window_tokens = rearrange(window_tokens, '(b x y) h d -> b h (x y) d', x = height // wsz, y = width // wsz)
-            token_rank = weight[:,:,0,1:].max(1)[0]
+        windowed_fmaps = rearrange(windowed_fmaps, '(b x y) h n d -> b h (x y) n d', x = height // wsz, y = width // wsz)
 
-        elif standard == "IMGAttnMean":
+        # windowed queries and keys (preceded by prenorm activation)
-            token_rank = weight[:,:,:,1:].sum(-2).mean(1)
 
-        elif standard == "IMGAttnMax":
+        w_q, w_k = self.window_tokens_to_qk(window_tokens).chunk(2, dim = -1)
-            token_rank = weight[:,:,:,1:].sum(-2).max(1)[0]
 
-        elif standard == "DiagAttnMean":
+        # scale
-            token_rank = torch.diagonal(weight, dim1=-2, dim2=-1)[:,:,1:].mean(1)
 
-        elif standard == "DiagAttnMax":
+        w_q = w_q * self.scale
-            token_rank = torch.diagonal(weight, dim1=-2, dim2=-1)[:,:,1:].max(1)[0]
 
-        elif standard == "MixedAttnMean":
+        # similarities
-            token_rank_1 = torch.diagonal(weight, dim1=-2, dim2=-1)[:,:,1:].mean(1)
-            token_rank_2 = weight[:,:,:,1:].sum(-2).mean(1)
-            token_rank = token_rank_1 * token_rank_2
 
-        elif standard == "MixedAttnMax":
+        w_dots = einsum('b h i d, b h j d -> b h i j', w_q, w_k)
-            token_rank_1 = torch.diagonal(weight, dim1=-2, dim2=-1)[:,:,1:].max(1)[0]
-            token_rank_2 = weight[:,:,:,1:].sum(-2).max(1)[0]
-            token_rank = token_rank_1 * token_rank_2
 
-        elif standard == "SumAttnMax":
+        w_attn = self.window_attend(w_dots)
-            token_rank_1 = torch.diagonal(weight, dim1=-2, dim2=-1)[:,:,1:].max(1)[0]
-            token_rank_2 = weight[:,:,:,1:].sum(-2).max(1)[0]
-            token_rank = token_rank_1 + token_rank_2
 
-        elif standard == "CosSimMean":
+        # aggregate the feature maps from the "depthwise" attention step (the most interesting part of the paper, one i haven't seen before)
-            weight = weight[:,:,1:,:].mean(1)
-            weight = weight / weight.norm(dim=-1, keepdim=True)
-            token_rank = -(weight @ weight.transpose(-1, -2)).sum(-1)
 
-        elif standard == "CosSimMax":
+        aggregated_windowed_fmap = einsum('b h i j, b h j w d -> b h i w d', w_attn, windowed_fmaps)
-            weight = weight[:,:,1:,:].max(1)[0]
-            weight = weight / weight.norm(dim=-1, keepdim=True)
-            token_rank = -(weight @ weight.transpose(-1, -2)).sum(-1)
 
-        elif standard == "Random":
+        # fold back the windows and then combine heads for aggregation
-            token_rank = torch.randn((B, N-1), device=weight.device)
 
-        else:
+        fmap = rearrange(aggregated_windowed_fmap, 'b h (x y) (w1 w2) d -> b (h d) (x w1) (y w2)', x = height // wsz, y = width // wsz, w1 = wsz, w2 = wsz)
-            print("Type\'", standard, "\' selection not supported.")
+        return self.to_out(fmap)
-            assert False
-        
-        token_rank = torch.argsort(token_rank, dim=1, descending=True) # B, N-1
-        index_kept = token_rank[:, :-num_prop]+1 # B, N-1-num_prop
-        index_prop = token_rank[:, -num_prop:]+1 # B, num_prop
-            
-    else:
-        if standard == "IMGAttnMean":
-            token_rank = weight.sum(-2).mean(1)
-        
-        elif standard == "IMGAttnMax":
-            token_rank = weight.sum(-2).max(1)[0]
-                
-        elif standard == "DiagAttnMean":
-            token_rank = torch.diagonal(weight, dim1=-2, dim2=-1).mean(1)
-            
-        elif standard == "DiagAttnMax":
-            token_rank = torch.diagonal(weight, dim1=-2, dim2=-1).max(1)[0]
-            
-        elif standard == "MixedAttnMean":
-            token_rank_1 = torch.diagonal(weight, dim1=-2, dim2=-1).mean(1)
-            token_rank_2 = weight.sum(-2).mean(1)
-            token_rank = token_rank_1 * token_rank_2
-            
-        elif standard == "MixedAttnMax":
-            token_rank_1 = torch.diagonal(weight, dim1=-2, dim2=-1).max(1)[0]
-            token_rank_2 = weight.sum(-2).max(1)[0]
-            token_rank = token_rank_1 * token_rank_2
-            
-        elif standard == "SumAttnMax":
-            token_rank_1 = torch.diagonal(weight, dim1=-2, dim2=-1).max(1)[0]
-            token_rank_2 = weight.sum(-2).max(1)[0]
-            token_rank = token_rank_1 + token_rank_2
-            
-        elif standard == "CosSimMean":
-            weight = weight.mean(1)
-            weight = weight / weight.norm(dim=-1, keepdim=True)
-            token_rank = -(weight @ weight.transpose(-1, -2)).sum(-1)
-        
-        elif standard == "CosSimMax":
-            weight = weight.max(1)[0]
-            weight = weight / weight.norm(dim=-1, keepdim=True)
-            token_rank = -(weight @ weight.transpose(-1, -2)).sum(-1)
-            
-        elif standard == "Random":
-            token_rank = torch.randn((B, N-1), device=weight.device)
-                
-        else:
-            print("Type\'", standard, "\' selection not supported.")
-            assert False
-        
-        token_rank = torch.argsort(token_rank, dim=1, descending=True) # B, N-1
-        index_kept = token_rank[:, :-num_prop] # B, N-1-num_prop
-        index_prop = token_rank[:, -num_prop:] # B, num_prop
-    return index_kept, index_prop
 
 class PoolFormerBlock(nn.Module):
     """
@@ -1221,8 +1093,13 @@ class PoolFormerBlock(nn.Module):
         #self.token_mixer = Pooling(pool_size=pool_size)
         # self.token_mixer = FNetBlock()
         self.window_size = 4
+        self.attn_heads = 4
         self.attn_mask = None
-        self.token_mixer = WindowAttention(dim=dim, window_size=to_2tuple(self.window_size), num_heads=4)
+        # self.token_mixer = WindowAttention(dim=dim, window_size=to_2tuple(self.window_size), num_heads=4)
+        self.token_mixer = nn.ModuleList([
+            DSSA(dim, heads=self.attn_heads, window_size=self.window_size),
+            FeedForwardDSSA(dim)
+        ])
         self.norm2 = norm_layer(dim)
         mlp_hidden_dim = int(dim * mlp_ratio)
         self.mlp = Mlp(in_features=dim, hidden_features=mlp_hidden_dim, 
@@ -1238,20 +1115,14 @@ class PoolFormerBlock(nn.Module):
             self.layer_scale_2 = nn.Parameter(
                 layer_scale_init_value * torch.ones((dim)), requires_grad=True)
 
-    def forward(self, x, weight, token_scales = None):
+    def forward(self, x):
         B, C, H, W = x.shape
-        x_windows = window_partition(x, self.window_size)
+        # x_windows = window_partition(x, self.window_size)
-        x_windows = x_windows.view(-1, self.window_size * self.window_size, C)
+        # x_windows = x_windows.view(-1, self.window_size * self.window_size, C)
-        attn_windows = self.token_mixer(x_windows, mask=self.attn_mask)
+        # attn_windows = self.token_mixer(x_windows, mask=self.attn_mask)
-        attn_windows = attn_windows.view(-1, self.window_size, self.window_size, C)
+        # attn_windows = attn_windows.view(-1, self.window_size, self.window_size, C)
-        x_attn = window_reverse(attn_windows, self.window_size, H, W)
+        # x_attn = window_reverse(attn_windows, self.window_size, H, W)
-        index_kept, index_prop = select(x_attn, standard="MixedAttnMax", num_prop=0,
+        x_attn = self.token_mixer(x)
-                                            cls_token=False)
-        original_shape = x_attn.shape
-        x_attn = x_attn.view(-1, self.window_size * self.window_size, C)
-        x_attn, weight, token_scales = propagate(x_attn, weight, index_kept, index_prop, standard="GraphProp",
-                                        alpha=0.1, token_scales=token_scales, cls_token=False)
-        x_attn = x_attn.view(*original_shape)
         if self.use_layer_scale:
             x = x + self.drop_path(
                 self.layer_scale_1.unsqueeze(-1).unsqueeze(-1)
@@ -1262,6 +1133,9 @@ class PoolFormerBlock(nn.Module):
         else:
             x = x + self.drop_path(x_attn)
             x = x + self.drop_path(self.mlp(self.norm2(x)))
+
+        if np.count_nonzero(np.isnan(x)) > 0:
+            print("PFBlock")
         return x
 class PatchEmbed(nn.Module):
     """
@@ -1347,7 +1221,7 @@ class LayerNormChannel(nn.Module):
             + self.bias.unsqueeze(-1).unsqueeze(-1)
         return x
 
-class FeedForward(nn.Module):
+class FeedForwardFNet(nn.Module):
     def __init__(self, dim, hidden_dim, dropout = 0.):
         super().__init__()
         self.net = nn.Sequential(
@@ -1383,7 +1257,7 @@ class FNet(nn.Module):
         for _ in range(depth):
             self.layers.append(nn.ModuleList([
                 PreNorm(dim, FNetBlock()),
-                PreNorm(dim, FeedForward(dim, mlp_dim, dropout = dropout))
+                PreNorm(dim, FeedForwardFNet(dim, mlp_dim, dropout = dropout))
             ]))
     def forward(self, x):
         for attn, ff in self.layers: