add support to extract lora with resnet and 2d blocks

Modified resize script so support different types of LoRA networks (refer to Kohaku-Blueleaf module implementation for structure).

networks/resize_lora.py

@@ -59,6 +59,72 @@ def index_sv_fro(S, target):
   return index
 
 
+# Modified from Kohaku-blueleaf's extract/merge functions
+def extract_conv(weight, lora_rank, dynamic_method, dynamic_param, device, scale=1):
+    out_size, in_size, kernel_size, _ = weight.size()
+    U, S, Vh = torch.linalg.svd(weight.reshape(out_size, -1).to(device))
+    
+    param_dict = rank_resize(S, lora_rank, dynamic_method, dynamic_param, scale)
+
+    lora_rank = param_dict["new_rank"]
+
+    U = U[:, :lora_rank]
+    S = S[:lora_rank]
+    U = U @ torch.diag(S)
+    Vh = Vh[:lora_rank, :]
+
+    param_dict["lora_down"] = Vh.reshape(lora_rank, in_size, kernel_size, kernel_size).cpu()
+    param_dict["lora_up"] = U.reshape(out_size, lora_rank, 1, 1).cpu()
+    del U, S, Vh, weight
+    return param_dict
+
+
+def extract_linear(weight, lora_rank, dynamic_method, dynamic_param, device, scale=1):
+    out_size, in_size = weight.size()
+    
+    U, S, Vh = torch.linalg.svd(weight.to(device))
+    
+    param_dict = rank_resize(S, lora_rank, dynamic_method, dynamic_param, scale)
+    lora_rank = param_dict["new_rank"]
+    
+    U = U[:, :lora_rank]
+    S = S[:lora_rank]
+    U = U @ torch.diag(S)
+    Vh = Vh[:lora_rank, :]
+    
+    param_dict["lora_down"] = Vh.reshape(lora_rank, in_size).cpu()
+    param_dict["lora_up"] = U.reshape(out_size, lora_rank).cpu()
+    del U, S, Vh, weight
+    return param_dict
+
+
+def merge_conv(lora_down, lora_up, device):
+    in_rank, in_size, kernel_size, k_ = lora_down.shape
+    out_size, out_rank, _, _ = lora_up.shape
+    assert in_rank == out_rank and kernel_size == k_, f"rank {in_rank} {out_rank} or kernel {kernel_size} {k_} mismatch"
+    
+    lora_down = lora_down.to(device)
+    lora_up = lora_up.to(device)
+
+    merged = lora_up.reshape(out_size, -1) @ lora_down.reshape(in_rank, -1)
+    weight = merged.reshape(out_size, in_size, kernel_size, kernel_size)
+    del lora_up, lora_down
+    return weight
+
+
+def merge_linear(lora_down, lora_up, device):
+    in_rank, in_size = lora_down.shape
+    out_size, out_rank = lora_up.shape
+    assert in_rank == out_rank, f"rank {in_rank} {out_rank} mismatch"
+    
+    lora_down = lora_down.to(device)
+    lora_up = lora_up.to(device)
+    
+    weight = lora_up @ lora_down
+    del lora_up, lora_down
+    return weight
+  
+
 def rank_resize(S, rank, dynamic_method, dynamic_param, scale=1):
     param_dict = {}
 
@@ -147,20 +213,11 @@ def resize_lora_model(lora_sd, new_rank, save_dtype, device, dynamic_method, dyn
         conv2d = (len(lora_down_weight.size()) == 4)
 
         if conv2d:
-          lora_down_weight = lora_down_weight.squeeze()
-          lora_up_weight = lora_up_weight.squeeze()
-
-        if device:
-          org_device = lora_up_weight.device
-          lora_up_weight = lora_up_weight.to(args.device)
-          lora_down_weight = lora_down_weight.to(args.device)
-
-        full_weight_matrix = torch.matmul(lora_up_weight, lora_down_weight)
-
-        U, S, Vh = torch.linalg.svd(full_weight_matrix)
-
-
-        param_dict = rank_resize(S, new_rank, dynamic_method, dynamic_param, scale)
+          full_weight_matrix = merge_conv(lora_down_weight, lora_up_weight, device)
+          param_dict = extract_conv(full_weight_matrix, new_rank, dynamic_method, dynamic_param, device, scale)
+        else:
+          full_weight_matrix = merge_linear(lora_down_weight, lora_up_weight, device)
+          param_dict = extract_linear(full_weight_matrix, new_rank, dynamic_method, dynamic_param, device, scale)
 
         new_rank = param_dict['new_rank']
         new_alpha = param_dict['new_alpha']
@@ -181,28 +238,9 @@ def resize_lora_model(lora_sd, new_rank, save_dtype, device, dynamic_method, dyn
         else:
           verbose_str+=f"\n"
 
-        U = U[:, :new_rank]
-        S = S[:new_rank]
-        U = U @ torch.diag(S)
 
-        Vh = Vh[:new_rank, :]
-
-        # dist = torch.cat([U.flatten(), Vh.flatten()])
-        # hi_val = torch.quantile(dist, CLAMP_QUANTILE)
-        # low_val = -hi_val
-        # U = U.clamp(low_val, hi_val)
-        # Vh = Vh.clamp(low_val, hi_val)
-
-        if conv2d:
-          U = U.unsqueeze(2).unsqueeze(3)
-          Vh = Vh.unsqueeze(2).unsqueeze(3)
-
-        if device:
-          U = U.to(org_device)
-          Vh = Vh.to(org_device)
-
-        o_lora_sd[block_down_name + "." + "lora_down.weight"] = Vh.to(save_dtype).contiguous()
-        o_lora_sd[block_up_name + "." + "lora_up.weight"] = U.to(save_dtype).contiguous()
+        o_lora_sd[block_down_name + "." + "lora_down.weight"] = param_dict["lora_down"].to(save_dtype).contiguous()
+        o_lora_sd[block_up_name + "." + "lora_up.weight"] = param_dict["lora_up"].to(save_dtype).contiguous()
         o_lora_sd[block_up_name + "." "alpha"] = torch.tensor(new_alpha).to(save_dtype)
 
         block_down_name = None
@@ -210,6 +248,7 @@ def resize_lora_model(lora_sd, new_rank, save_dtype, device, dynamic_method, dyn
         lora_down_weight = None
         lora_up_weight = None
         weights_loaded = False
+        del param_dict
 
   if verbose:
     print(verbose_str)