From a686a76eccf5d44d21aec4af9544c22655aa73f4 Mon Sep 17 00:00:00 2001
From: Anthony Platanios <e.a.platanios@gmail.com>
Date: Tue, 2 Apr 2019 08:17:10 -0400
Subject: [PATCH 1/3] Updated the convolution ops to support explicit paddings.

---
 Sources/DeepLearning/Operators.swift | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/Sources/DeepLearning/Operators.swift b/Sources/DeepLearning/Operators.swift
index 51b2406a8..3a660c07a 100644
--- a/Sources/DeepLearning/Operators.swift
+++ b/Sources/DeepLearning/Operators.swift
@@ -98,12 +98,14 @@ public extension Tensor where Scalar: BinaryFloatingPoint {
 }
 
 //===------------------------------------------------------------------------------------------===//
-// Convolution and pooling
+// Convolution and Pooling
 //===------------------------------------------------------------------------------------------===//
 
 /// A padding scheme. Used by padding, convolution, and pooling ops.
 // @_frozen // SR-9739
 public enum Padding {
+    /// The "explicit" padding scheme.
+    case explicit(_ paddings: [Int32])
     /// The "valid" padding scheme.
     case valid
     /// The "same" padding scheme.
@@ -112,12 +114,22 @@ public enum Padding {
 
 public extension Padding {
     @inlinable
-    var raw: Raw.Padding {
+    var raw: Raw.Padding2 {
         switch self {
+        case .explicit: return .explicit
         case .same: return .same
         case .valid: return .valid
         }
     }
+
+    @inlinable
+    internal var explicitPaddings: [Int32] {
+        switch self {
+        case .explicit(let paddings): return paddings
+        case .same: return []
+        case .valid: return []
+        }
+    }
 }
 
 public extension Tensor where Scalar: TensorFlowFloatingPoint {
@@ -135,7 +147,8 @@ public extension Tensor where Scalar: TensorFlowFloatingPoint {
             filter: filter,
             outBackprop: self,
             strides: [strides.0, strides.1, strides.2, strides.3],
-            padding: padding.raw)
+            padding: padding.raw,
+            explicitPaddings: padding.explicitPaddings)
     }
 
     /// TensorFlow builtin conv2d gradient helper for the filter.
@@ -152,7 +165,8 @@ public extension Tensor where Scalar: TensorFlowFloatingPoint {
             filterSizes: filterSizes,
             outBackprop: self,
             strides: [strides.0, strides.1, strides.2, strides.3],
-            padding: padding.raw)
+            padding: padding.raw,
+            explicitPaddings: padding.explicitPaddings)
     }
 
     @inlinable
@@ -282,7 +296,8 @@ public extension Tensor where Scalar: FloatingPoint {
             self,
             filter: filter,
             strides: [strides.0, strides.1, strides.2, strides.3],
-            padding: padding.raw)
+            padding: padding.raw,
+            explicitPaddings: padding.explicitPaddings)
     }
 
     /// Computes a 2-D max pooling, with the specified kernel sizes, strides, and

From 8494c04d0ef849119b73cd566bccb304bb11a999 Mon Sep 17 00:00:00 2001
From: Anthony Platanios <e.a.platanios@gmail.com>
Date: Tue, 2 Apr 2019 08:22:58 -0400
Subject: [PATCH 2/3] Small fix.

---
 Sources/DeepLearning/Operators.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sources/DeepLearning/Operators.swift b/Sources/DeepLearning/Operators.swift
index 3a660c07a..501722a9e 100644
--- a/Sources/DeepLearning/Operators.swift
+++ b/Sources/DeepLearning/Operators.swift
@@ -105,7 +105,7 @@ public extension Tensor where Scalar: BinaryFloatingPoint {
 // @_frozen // SR-9739
 public enum Padding {
     /// The "explicit" padding scheme.
-    case explicit(_ paddings: [Int32])
+    case explicit([Int32])
     /// The "valid" padding scheme.
     case valid
     /// The "same" padding scheme.

From 5dfaaeecf5b48e4784ec2c3b9c0607f2bb7ceced Mon Sep 17 00:00:00 2001
From: Anthony Platanios <e.a.platanios@gmail.com>
Date: Tue, 2 Apr 2019 08:32:29 -0400
Subject: [PATCH 3/3] Added documentation string for the "explicit" padding
 scheme.

---
 Sources/DeepLearning/Operators.swift | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Sources/DeepLearning/Operators.swift b/Sources/DeepLearning/Operators.swift
index 501722a9e..827890b3d 100644
--- a/Sources/DeepLearning/Operators.swift
+++ b/Sources/DeepLearning/Operators.swift
@@ -104,7 +104,8 @@ public extension Tensor where Scalar: BinaryFloatingPoint {
 /// A padding scheme. Used by padding, convolution, and pooling ops.
 // @_frozen // SR-9739
 public enum Padding {
-    /// The "explicit" padding scheme.
+    /// The "explicit" padding scheme, which is defined by an array indicating the explicit padding 
+    /// sizes at the start and end of each dimension.
     case explicit([Int32])
     /// The "valid" padding scheme.
     case valid