Add ModuleList, LayerNorm. Also misc improvements

core/src/main/scala/torch/nn/modules/container/ModuleList.scala

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 storch.dev
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package torch
+package nn
+package modules
+package container
+
+import sourcecode.Name
+import scala.util.Random
+
+final class ModuleList[D <: DType](override val modules: TensorModule[D]*)
+    extends Module
+    with Seq[TensorModule[D]]:
+  // with TensorModule[D]:
+  modules.zipWithIndex.foreach((module, index) =>
+    this.register(module)(using Name(index.toString()))
+  )
+
+  override def iterator: Iterator[TensorModule[D]] = modules.iterator
+
+  // def apply(v1: Int | torch.Tensor[D]): torch.nn.modules.TensorModule[D] & torch.Tensor[D] = ???
+  def apply(i: Int): torch.nn.modules.TensorModule[D] = modules(i)
+
+  override def length: Int = modules.length
+
+  override def toString = getClass().getSimpleName()

core/src/main/scala/torch/nn/modules/normalization/GroupNorm.scala

@@ -36,7 +36,7 @@ import torch.{DType, Tensor}
   *   a boolean value that when set to `true`, this module has learnable per-channel affine
   *   parameters initialized to ones (for weights) and zeros (for biases)
   */
-final class GroupNorm[ParamType <: DType](
+final class GroupNorm[ParamType <: DType: Default](
     numGroups: Int,
     numChannels: Int,
     eps: Double = 1e-05,

core/src/main/scala/torch/nn/modules/normalization/LayerNorm.scala

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2022 storch.dev
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package torch
+package nn
+package modules
+package normalization
+
+import org.bytedeco.pytorch
+import org.bytedeco.pytorch.{LayerNormImpl, LayerNormOptions, LongVector}
+import torch.nn.modules.TensorModule
+import torch.{DType, Tensor}
+
+/** Applies Layer Normalization over a mini-batch of inputs as described in the paper Layer
+  * Normalization // TODO Add docs
+  */
+final class LayerNorm[ParamType <: DType: Default](
+    normalizedShape: Seq[Int] | Int,
+    eps: Double = 1e-05,
+    elementwiseAffine: Boolean = true
+) extends TensorModule[ParamType]:
+  private val options: LayerNormOptions = normalizedShape match {
+    case normalizedShape: Seq[Int] =>
+      LayerNormOptions(LongVector(normalizedShape.map(_.toLong)*))
+    case normalizedShape: Int =>
+      LayerNormOptions(LongVector(normalizedShape.toLong))
+  }
+  options.eps().put(eps)
+  options.elementwise_affine().put(elementwiseAffine)
+
+  override private[torch] val nativeModule: LayerNormImpl = LayerNormImpl(options)
+
+  override def registerWithParent[M <: pytorch.Module](parent: M)(using
+      name: sourcecode.Name
+  ): Unit =
+    parent.register_module(name.value, nativeModule)
+
+  val weight: Tensor[ParamType] = Tensor[ParamType](nativeModule.weight)
+  val bias: Tensor[ParamType] = Tensor[ParamType](nativeModule.bias)
+
+  def apply(t: Tensor[ParamType]): Tensor[ParamType] =
+    Tensor[ParamType](nativeModule.forward(t.native))

core/src/main/scala/torch/nn/modules/sparse/Embedding.scala

@@ -27,6 +27,34 @@ import org.bytedeco.pytorch.EmbeddingOptions
 import torch.nn.modules.{HasParams, HasWeight, TensorModule}
 import torch.internal.NativeConverters.{toNative, doubleToDoublePointer}
 
+/** A simple lookup table that stores embeddings of a fixed dictionary and size.
+  *
+  * This module is often used to store word embeddings and retrieve them using indices. The input to
+  * the module is a list of indices, and the output is the corresponding word embeddings.
+  *
+  * @group nn_sparse
+  *
+  * @param numEmbeddings
+  *   Size of the dictionary of embeddings
+  * @param embeddingDim
+  *   The size of each embedding vector
+  * @param paddingIdx
+  *   If specified, the entries at `paddingIdx` do not contribute to the gradient; therefore, the
+  *   embedding vector at `paddingIdx` is not updated during training, i.e. it remains as a fixed
+  *   "pad". For a newly constructed Embedding, the embedding vector at `paddingIdx` will default to
+  *   all zeros, but can be updated to another value to be used as the padding vector.
+  * @param maxNorm
+  *   If given, each embedding vector with norm larger than `maxNorm` is renormalized to have norm
+  *   `maxNorm`.
+  * @param normType
+  *   The p of the p-norm to compute for the `maxNorm` option. Default `2`.
+  * @param scaleGradByFreq
+  *   If given, this will scale gradients by the inverse of frequency of the words in the
+  *   mini-batch. Default `false`.
+  * @param sparse
+  *   If ``True``, gradient w.r.t. `weight` matrix will be a sparse tensor. See Notes for more
+  *   details regarding sparse gradients.
+  */
 final class Embedding[ParamType <: FloatNN | ComplexNN: Default](
     numEmbeddings: Int,
     embeddingDim: Int,

core/src/main/scala/torch/nn/package.scala

@@ -37,11 +37,13 @@ package object nn {
   export modules.batchnorm.BatchNorm1d
   export modules.batchnorm.BatchNorm2d
   export modules.container.Sequential
+  export modules.container.ModuleList
   export modules.conv.Conv2d
   export modules.flatten.Flatten
   export modules.linear.Linear
   export modules.linear.Identity
   export modules.normalization.GroupNorm
+  export modules.normalization.LayerNorm
   export modules.pooling.AdaptiveAvgPool2d
   export modules.pooling.MaxPool2d
   export modules.sparse.Embedding