Update forge_freeu.py

extensions-builtin/sd_forge_freeu/scripts/forge_freeu.py

@@ -1,7 +1,43 @@
+import torch
 import gradio as gr
 from modules import scripts
 
 
+def Fourier_filter(x, threshold, scale):
+    x_freq = torch.fft.fftn(x.float(), dim=(-2, -1))
+    x_freq = torch.fft.fftshift(x_freq, dim=(-2, -1))
+    B, C, H, W = x_freq.shape
+    mask = torch.ones((B, C, H, W), device=x.device)
+    crow, ccol = H // 2, W //2
+    mask[..., crow - threshold:crow + threshold, ccol - threshold:ccol + threshold] = scale
+    x_freq = x_freq * mask
+    x_freq = torch.fft.ifftshift(x_freq, dim=(-2, -1))
+    x_filtered = torch.fft.ifftn(x_freq, dim=(-2, -1)).real
+    return x_filtered.to(x.dtype)
+
+
+def patch(model, b1, b2, s1, s2):
+    model_channels = model.model.model_config.unet_config["model_channels"]
+    scale_dict = {model_channels * 4: (b1, s1), model_channels * 2: (b2, s2)}
+
+    def output_block_patch(h, hsp, transformer_options):
+        scale = scale_dict.get(h.shape[1], None)
+        if scale is not None:
+            hidden_mean = h.mean(1).unsqueeze(1)
+            B = hidden_mean.shape[0]
+            hidden_max, _ = torch.max(hidden_mean.view(B, -1), dim=-1, keepdim=True)
+            hidden_min, _ = torch.min(hidden_mean.view(B, -1), dim=-1, keepdim=True)
+            hidden_mean = (hidden_mean - hidden_min.unsqueeze(2).unsqueeze(3)) / \
+                          (hidden_max - hidden_min).unsqueeze(2).unsqueeze(3)
+            h[:, :h.shape[1] // 2] = h[:, :h.shape[1] // 2] * ((scale[0] - 1) * hidden_mean + 1)
+            hsp = Fourier_filter(hsp, threshold=1, scale=scale[1])
+        return h, hsp
+
+    m = model.clone()
+    m.set_model_output_block_patch(output_block_patch)
+    return m
+
+
 class FreeUForForge(scripts.Script):
     def title(self):
         return "FreeU Integrated"
@@ -22,7 +58,7 @@ class FreeUForForge(scripts.Script):
 
     def process_batch(self, p, *script_args, **kwargs):
         freeu_enabled, freeu_b1, freeu_b2, freeu_s1, freeu_s2 = script_args
-        
+
         if not freeu_enabled:
             return