(doc/fluxion/lora) add/convert docstrings to mkdocstrings format

src/refiners/fluxion/adapters/__init__.py

@@ -1,3 +1,10 @@
 from refiners.fluxion.adapters.adapter import Adapter
+from refiners.fluxion.adapters.lora import Conv2dLora, LinearLora, Lora, LoraAdapter
 
-__all__ = ["Adapter"]
+__all__ = [
+    "Adapter",
+    "Lora",
+    "LinearLora",
+    "Conv2dLora",
+    "LoraAdapter",
+]

src/refiners/fluxion/adapters/lora.py

@@ -9,6 +9,21 @@ from refiners.fluxion.adapters.adapter import Adapter
 
 
 class Lora(fl.Chain, ABC):
+    """Low-rank approximation (LoRA) layer.
+
+    This layer is composed of two [`WeightedModule`][refiners.fluxion.layers.WeightedModule]:
+
+    - `down`: initialized with a random normal distribution
+    - `up`: initialized with zeros
+
+    Note:
+        This layer is not meant to be used directly.
+        Instead, use one of its subclasses:
+
+        - [`LinearLora`][refiners.fluxion.adapters.lora.LinearLora]
+        - [`Conv2dLora`][refiners.fluxion.adapters.lora.Conv2dLora]
+    """
+
     def __init__(
         self,
         name: str,
@@ -18,11 +33,23 @@ class Lora(fl.Chain, ABC):
         device: Device | str | None = None,
         dtype: DType | None = None,
     ) -> None:
+        """Initialize the LoRA layer.
+
+        Args:
+            name: The name of the LoRA.
+            rank: The rank of the LoRA.
+            scale: The scale of the LoRA.
+            device: The device of the LoRA weights.
+            dtype: The dtype of the LoRA weights.
+        """
         self.name = name
         self._rank = rank
         self._scale = scale
 
-        super().__init__(*self.lora_layers(device=device, dtype=dtype), fl.Multiply(scale))
+        super().__init__(
+            *self.lora_layers(device=device, dtype=dtype),
+            fl.Multiply(scale),
+        )
 
         normal_(tensor=self.down.weight, std=1 / self.rank)
         zeros_(tensor=self.up.weight)
@@ -31,26 +58,36 @@ class Lora(fl.Chain, ABC):
     def lora_layers(
         self, device: Device | str | None = None, dtype: DType | None = None
     ) -> tuple[fl.WeightedModule, fl.WeightedModule]:
+        """Create the down and up layers of the LoRA.
+
+        Args:
+            device: The device of the LoRA weights.
+            dtype: The dtype of the LoRA weights.
+        """
         ...
 
     @property
     def down(self) -> fl.WeightedModule:
+        """The down layer."""
         down_layer = self[0]
         assert isinstance(down_layer, fl.WeightedModule)
         return down_layer
 
     @property
     def up(self) -> fl.WeightedModule:
+        """The up layer."""
         up_layer = self[1]
         assert isinstance(up_layer, fl.WeightedModule)
         return up_layer
 
     @property
     def rank(self) -> int:
+        """The rank of the low-rank approximation."""
         return self._rank
 
     @property
     def scale(self) -> float:
+        """The scale of the low-rank approximation."""
         return self._scale
 
     @scale.setter
@@ -119,6 +156,12 @@ class Lora(fl.Chain, ABC):
             return LoraAdapter(layer, self), parent
 
     def load_weights(self, down_weight: Tensor, up_weight: Tensor) -> None:
+        """Load the weights of the LoRA.
+
+        Args:
+            down_weight: The down weight.
+            up_weight: The up weight.
+        """
         assert down_weight.shape == self.down.weight.shape
         assert up_weight.shape == self.up.weight.shape
         self.down.weight = TorchParameter(down_weight.to(device=self.device, dtype=self.dtype))
@@ -126,6 +169,11 @@ class Lora(fl.Chain, ABC):
 
 
 class LinearLora(Lora):
+    """Low-rank approximation (LoRA) layer for linear layers.
+
+    This layer uses two [`Linear`][refiners.fluxion.layers.Linear] layers as its down and up layers.
+    """
+
     def __init__(
         self,
         name: str,
@@ -137,10 +185,27 @@ class LinearLora(Lora):
         device: Device | str | None = None,
         dtype: DType | None = None,
     ) -> None:
+        """Initialize the LoRA layer.
+
+        Args:
+            name: The name of the LoRA.
+            in_features: The number of input features.
+            out_features: The number of output features.
+            rank: The rank of the LoRA.
+            scale: The scale of the LoRA.
+            device: The device of the LoRA weights.
+            dtype: The dtype of the LoRA weights.
+        """
         self.in_features = in_features
         self.out_features = out_features
 
-        super().__init__(name, rank=rank, scale=scale, device=device, dtype=dtype)
+        super().__init__(
+            name,
+            rank=rank,
+            scale=scale,
+            device=device,
+            dtype=dtype,
+        )
 
     @classmethod
     def from_weights(
@@ -190,6 +255,11 @@ class LinearLora(Lora):
 
 
 class Conv2dLora(Lora):
+    """Low-rank approximation (LoRA) layer for 2D convolutional layers.
+
+    This layer uses two [`Conv2d`][refiners.fluxion.layers.Conv2d] layers as its down and up layers.
+    """
+
     def __init__(
         self,
         name: str,
@@ -204,13 +274,33 @@ class Conv2dLora(Lora):
         device: Device | str | None = None,
         dtype: DType | None = None,
     ) -> None:
+        """Initialize the LoRA layer.
+
+        Args:
+            name: The name of the LoRA.
+            in_channels: The number of input channels.
+            out_channels: The number of output channels.
+            rank: The rank of the LoRA.
+            scale: The scale of the LoRA.
+            kernel_size: The kernel size of the LoRA.
+            stride: The stride of the LoRA.
+            padding: The padding of the LoRA.
+            device: The device of the LoRA weights.
+            dtype: The dtype of the LoRA weights.
+        """
         self.in_channels = in_channels
         self.out_channels = out_channels
         self.kernel_size = kernel_size
         self.stride = stride
         self.padding = padding
 
-        super().__init__(name, rank=rank, scale=scale, device=device, dtype=dtype)
+        super().__init__(
+            name,
+            rank=rank,
+            scale=scale,
+            device=device,
+            dtype=dtype,
+        )
 
     @classmethod
     def from_weights(
@@ -279,20 +369,34 @@ class Conv2dLora(Lora):
 
 
 class LoraAdapter(fl.Sum, Adapter[fl.WeightedModule]):
+    """Adapter for LoRA layers.
+
+    This adapter simply sums the target layer with the given LoRA layers.
+    """
+
     def __init__(self, target: fl.WeightedModule, /, *loras: Lora) -> None:
+        """Initialize the adapter.
+
+        Args:
+            target: The target layer.
+            loras: The LoRA layers.
+        """
         with self.setup_adapter(target):
             super().__init__(target, *loras)
 
     @property
     def names(self) -> list[str]:
+        """The names of the LoRA layers."""
         return [lora.name for lora in self.layers(Lora)]
 
     @property
     def loras(self) -> dict[str, Lora]:
+        """The LoRA layers."""
         return {lora.name: lora for lora in self.layers(Lora)}
 
     @property
     def scales(self) -> dict[str, float]:
+        """The scales of the LoRA layers."""
         return {lora.name: lora.scale for lora in self.layers(Lora)}
 
     @scales.setter
@@ -301,10 +405,20 @@ class LoraAdapter(fl.Sum, Adapter[fl.WeightedModule]):
             self.loras[name].scale = value
 
     def add_lora(self, lora: Lora, /) -> None:
+        """Add a LoRA layer to the adapter.
+
+        Args:
+            lora: The LoRA layer to add.
+        """
         assert lora.name not in self.names, f"LoRA layer with name {lora.name} already exists"
         self.append(lora)
 
     def remove_lora(self, name: str, /) -> Lora | None:
+        """Remove a LoRA layer from the adapter.
+
+        Args:
+            name: The name of the LoRA layer to remove.
+        """
         if name in self.names:
             lora = self.loras[name]
             self.remove(lora)