diff --git a/swift/01a_fastai_layers.ipynb b/swift/01a_fastai_layers.ipynb
index 97721341a..b1b7ea2dd 100644
--- a/swift/01a_fastai_layers.ipynb
+++ b/swift/01a_fastai_layers.ipynb
@@ -460,6 +460,8 @@
     "\n",
     "@frozen\n",
     "public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {\n",
+    "    // swift-apis#1037 workaround.\n",
+    "    public typealias TangentVector = EmptyTangentVector\n",
     "    // TF-603 workaround.\n",
     "    public typealias Input = Tensor<Scalar>\n",
     "    public typealias Output = Tensor<Scalar>\n",
@@ -508,6 +510,8 @@
     "\n",
     "@frozen\n",
     "public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {\n",
+    "    // swift-apis#1037 workaround.\n",
+    "    public typealias TangentVector = EmptyTangentVector\n",
     "    // TF-603 workaround.\n",
     "    public typealias Input = Tensor<Scalar>\n",
     "    public typealias Output = Tensor<Scalar>\n",
diff --git a/swift/FastaiNotebook_01a_fastai_layers/Sources/FastaiNotebook_01a_fastai_layers/01a_fastai_layers.swift b/swift/FastaiNotebook_01a_fastai_layers/Sources/FastaiNotebook_01a_fastai_layers/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_01a_fastai_layers/Sources/FastaiNotebook_01a_fastai_layers/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_01a_fastai_layers/Sources/FastaiNotebook_01a_fastai_layers/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_02_fully_connected/Sources/FastaiNotebook_02_fully_connected/01a_fastai_layers.swift b/swift/FastaiNotebook_02_fully_connected/Sources/FastaiNotebook_02_fully_connected/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_02_fully_connected/Sources/FastaiNotebook_02_fully_connected/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_02_fully_connected/Sources/FastaiNotebook_02_fully_connected/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_02a_why_sqrt5/Sources/FastaiNotebook_02a_why_sqrt5/01a_fastai_layers.swift b/swift/FastaiNotebook_02a_why_sqrt5/Sources/FastaiNotebook_02a_why_sqrt5/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_02a_why_sqrt5/Sources/FastaiNotebook_02a_why_sqrt5/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_02a_why_sqrt5/Sources/FastaiNotebook_02a_why_sqrt5/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_03_minibatch_training/Sources/FastaiNotebook_03_minibatch_training/01a_fastai_layers.swift b/swift/FastaiNotebook_03_minibatch_training/Sources/FastaiNotebook_03_minibatch_training/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_03_minibatch_training/Sources/FastaiNotebook_03_minibatch_training/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_03_minibatch_training/Sources/FastaiNotebook_03_minibatch_training/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_04_callbacks/Sources/FastaiNotebook_04_callbacks/01a_fastai_layers.swift b/swift/FastaiNotebook_04_callbacks/Sources/FastaiNotebook_04_callbacks/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_04_callbacks/Sources/FastaiNotebook_04_callbacks/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_04_callbacks/Sources/FastaiNotebook_04_callbacks/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_05_anneal/Sources/FastaiNotebook_05_anneal/01a_fastai_layers.swift b/swift/FastaiNotebook_05_anneal/Sources/FastaiNotebook_05_anneal/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_05_anneal/Sources/FastaiNotebook_05_anneal/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_05_anneal/Sources/FastaiNotebook_05_anneal/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_05b_early_stopping/Sources/FastaiNotebook_05b_early_stopping/01a_fastai_layers.swift b/swift/FastaiNotebook_05b_early_stopping/Sources/FastaiNotebook_05b_early_stopping/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_05b_early_stopping/Sources/FastaiNotebook_05b_early_stopping/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_05b_early_stopping/Sources/FastaiNotebook_05b_early_stopping/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_06_cuda/Sources/FastaiNotebook_06_cuda/01a_fastai_layers.swift b/swift/FastaiNotebook_06_cuda/Sources/FastaiNotebook_06_cuda/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_06_cuda/Sources/FastaiNotebook_06_cuda/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_06_cuda/Sources/FastaiNotebook_06_cuda/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_07_batchnorm/Sources/FastaiNotebook_07_batchnorm/01a_fastai_layers.swift b/swift/FastaiNotebook_07_batchnorm/Sources/FastaiNotebook_07_batchnorm/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_07_batchnorm/Sources/FastaiNotebook_07_batchnorm/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_07_batchnorm/Sources/FastaiNotebook_07_batchnorm/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_08_data_block/Sources/FastaiNotebook_08_data_block/01a_fastai_layers.swift b/swift/FastaiNotebook_08_data_block/Sources/FastaiNotebook_08_data_block/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_08_data_block/Sources/FastaiNotebook_08_data_block/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_08_data_block/Sources/FastaiNotebook_08_data_block/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_08a_heterogeneous_dictionary/Sources/FastaiNotebook_08a_heterogeneous_dictionary/01a_fastai_layers.swift b/swift/FastaiNotebook_08a_heterogeneous_dictionary/Sources/FastaiNotebook_08a_heterogeneous_dictionary/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_08a_heterogeneous_dictionary/Sources/FastaiNotebook_08a_heterogeneous_dictionary/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_08a_heterogeneous_dictionary/Sources/FastaiNotebook_08a_heterogeneous_dictionary/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_08c_data_block_generic/Sources/FastaiNotebook_08c_data_block_generic/01a_fastai_layers.swift b/swift/FastaiNotebook_08c_data_block_generic/Sources/FastaiNotebook_08c_data_block_generic/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_08c_data_block_generic/Sources/FastaiNotebook_08c_data_block_generic/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_08c_data_block_generic/Sources/FastaiNotebook_08c_data_block_generic/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_09_optimizer/Sources/FastaiNotebook_09_optimizer/01a_fastai_layers.swift b/swift/FastaiNotebook_09_optimizer/Sources/FastaiNotebook_09_optimizer/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_09_optimizer/Sources/FastaiNotebook_09_optimizer/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_09_optimizer/Sources/FastaiNotebook_09_optimizer/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_10_mixup_ls/Sources/FastaiNotebook_10_mixup_ls/01a_fastai_layers.swift b/swift/FastaiNotebook_10_mixup_ls/Sources/FastaiNotebook_10_mixup_ls/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_10_mixup_ls/Sources/FastaiNotebook_10_mixup_ls/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_10_mixup_ls/Sources/FastaiNotebook_10_mixup_ls/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_11_imagenette/Package.resolved b/swift/FastaiNotebook_11_imagenette/Package.resolved
deleted file mode 100644
index 63180a5be..000000000
--- a/swift/FastaiNotebook_11_imagenette/Package.resolved
+++ /dev/null
@@ -1,34 +0,0 @@
-{
-  "object": {
-    "pins": [
-      {
-        "package": "Just",
-        "repositoryURL": "https://github.com/saeta/Just",
-        "state": {
-          "branch": null,
-          "revision": "35dbe6823bf5f9b9bb996c1fe6c9ad9a4c59d821",
-          "version": "0.7.3"
-        }
-      },
-      {
-        "package": "NotebookExport",
-        "repositoryURL": "https://github.com/latenitesoft/NotebookExport",
-        "state": {
-          "branch": null,
-          "revision": "9102631248217cc8ef405e92edae7bdcebcb7166",
-          "version": "0.6.0"
-        }
-      },
-      {
-        "package": "Path.swift",
-        "repositoryURL": "https://github.com/mxcl/Path.swift",
-        "state": {
-          "branch": null,
-          "revision": "dac007e907a4f4c565cfdc55a9ce148a761a11d5",
-          "version": "0.16.3"
-        }
-      }
-    ]
-  },
-  "version": 1
-}
diff --git a/swift/FastaiNotebook_11_imagenette/Sources/FastaiNotebook_11_imagenette/01a_fastai_layers.swift b/swift/FastaiNotebook_11_imagenette/Sources/FastaiNotebook_11_imagenette/01a_fastai_layers.swift
index b27ec3bcf..7316d7440 100644
--- a/swift/FastaiNotebook_11_imagenette/Sources/FastaiNotebook_11_imagenette/01a_fastai_layers.swift
+++ b/swift/FastaiNotebook_11_imagenette/Sources/FastaiNotebook_11_imagenette/01a_fastai_layers.swift
@@ -223,6 +223,8 @@ public extension FAConv2D {
 
 @frozen
 public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
@@ -263,6 +265,8 @@ public struct FAAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,Parameterles
 
 @frozen
 public struct FAGlobalAvgPool2D<Scalar: TensorFlowFloatingPoint>: FALayer,ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
     // TF-603 workaround.
     public typealias Input = Tensor<Scalar>
     public typealias Output = Tensor<Scalar>
diff --git a/swift/FastaiNotebook_11_imagenette/Sources/FastaiNotebook_11_imagenette/11_imagenette.swift b/swift/FastaiNotebook_11_imagenette/Sources/FastaiNotebook_11_imagenette/11_imagenette.swift
index c06ca8064..8488ee827 100644
--- a/swift/FastaiNotebook_11_imagenette/Sources/FastaiNotebook_11_imagenette/11_imagenette.swift
+++ b/swift/FastaiNotebook_11_imagenette/Sources/FastaiNotebook_11_imagenette/11_imagenette.swift
@@ -29,6 +29,9 @@ public struct ConvLayer: Layer {
 }
 
 public struct MaybeAvgPool2D: ParameterlessLayer {
+    // swift-apis#1037 workaround.
+    public typealias TangentVector = EmptyTangentVector
+
     @noDerivative let poolSize: (Int, Int, Int, Int)
     @noDerivative let strides: (Int, Int, Int, Int)
     @noDerivative let padding: Padding