fix LoRAs on Self target

scripts/training/finetune-ldm-lora.py

@@ -4,7 +4,7 @@ from pydantic import BaseModel
 from loguru import logger
 from refiners.adapters.lora import LoraAdapter, Lora
 from refiners.fluxion.utils import save_to_safetensors
-from refiners.foundationals.latent_diffusion.lora import LoraTarget
+from refiners.foundationals.latent_diffusion.lora import LoraTarget, lora_targets
 import refiners.fluxion.layers as fl
 from torch import Tensor
 from torch.utils.data import Dataset
@@ -28,15 +28,11 @@ class LoraConfig(BaseModel):
     lda_targets: list[LoraTarget]
 
     def apply_loras_to_target(self, module: fl.Chain, target: LoraTarget) -> None:
-        for layer in module.layers(layer_type=target.get_class()):
-            for linear, parent in layer.walk(fl.Linear):
-                adapter = LoraAdapter(
-                    target=linear,
-                    rank=self.rank,
-                )
-                adapter.inject(parent)
-                for linear in adapter.Lora.layers(fl.Linear):
-                    linear.requires_grad_(requires_grad=True)
+        for linear, parent in lora_targets(module, target):
+            adapter = LoraAdapter(target=linear, rank=self.rank)
+            adapter.inject(parent)
+            for linear in adapter.Lora.layers(fl.Linear):
+                linear.requires_grad_(requires_grad=True)
 
 
 class TriggerPhraseDataset(TextEmbeddingLatentsDataset):

src/refiners/foundationals/latent_diffusion/lora.py

@@ -1,5 +1,7 @@
 from enum import Enum
 from pathlib import Path
+from typing import Iterator
+
 
 from torch import Tensor, device as Device
 from torch.nn import Parameter as TorchParameter
@@ -42,15 +44,17 @@ def get_lora_rank(weights: list[Tensor]) -> int:
     return ranks.pop()
 
 
+def lora_targets(module: fl.Chain, target: LoraTarget) -> Iterator[tuple[fl.Linear, fl.Chain]]:
+    it = [module] if target == LoraTarget.Self else module.layers(layer_type=target.get_class())
+    for layer in it:
+        for t in layer.walk(fl.Linear):
+            yield t
+
+
 def apply_loras_to_target(module: fl.Chain, target: LoraTarget, rank: int, scale: float) -> None:
-    for layer in module.layers(layer_type=target.get_class()):
-        for linear, parent in layer.walk(fl.Linear):
-            adapter = LoraAdapter(
-                target=linear,
-                rank=rank,
-                scale=scale,
-            )
-            adapter.inject(parent)
+    for linear, parent in lora_targets(module, target):
+        adapter = LoraAdapter(target=linear, rank=rank, scale=scale)
+        adapter.inject(parent)
 
 
 class LoraWeights:

tests/foundationals/latent_diffusion/test_lora.py

@@ -0,0 +1,16 @@
+from refiners.adapters.lora import Lora
+from refiners.foundationals.latent_diffusion.lora import apply_loras_to_target, LoraTarget
+import refiners.fluxion.layers as fl
+
+
+def test_lora_target_self() -> None:
+    chain = fl.Chain(
+        fl.Chain(
+            fl.Linear(in_features=1, out_features=1),
+            fl.Linear(in_features=1, out_features=1),
+        ),
+        fl.Linear(in_features=1, out_features=2),
+    )
+    apply_loras_to_target(chain, LoraTarget.Self, 1, 1.0)
+
+    assert len(list(chain.layers(Lora))) == 3