Project created for Torch backend

Backends/SiaNet.Backend.Torch/NDArrayTensor.cs

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+using SiaNet.Engine;
+using System;
+using Tensor = SiaNet.Engine.Tensor;
+
+namespace SiaNet.Backend.Torch
+{
+    public class NDArrayTensor : Tensor
+    {
+        public NDArrayTensor()
+        {
+            K = new SiaNetBackend();
+        }
+
+        public NDArrayTensor(object arr)
+        {
+            K = new SiaNetBackend();
+        }
+
+        public override string Name
+        {
+            get;
+            set;
+        }
+    }
+}

Backends/SiaNet.Backend.Torch/SiaNet.Backend.Torch.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\SiaNet.Engine\SiaNet.Engine.csproj" />
+  </ItemGroup>
+
+</Project>

Backends/SiaNet.Backend.Torch/SiaNetActivations.cs

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+using SiaNet.Engine;
+using SiaNet.Engine.Layers;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace SiaNet.Backend.Torch
+{
+    public class SiaNetActivations : ActivationFunc
+    {
+        SiaNetBackend backend = null;
+        public SiaNetActivations(IBackend backend)
+            : base(backend)
+        {
+            backend = K;
+        }
+
+    }
+}