Added sparse and fixed problem with longs.

Author: interesaaat

TorchSharp/Tensor/ITorchTensor.cs

@@ -14,18 +14,22 @@ public interface ITorchTensor<T> : IDisposable
 
         string Device { get; }
 
-        ITorchTensor<T> Cpu();
-
-        ITorchTensor<T> Cuda();
-
         Span<T> Data { get; }
 
         T Item { get; }
 
+        bool IsSparse { get; }
+
+        bool IsVariable { get; }
+
         long GetTensorDimension(int dim);
 
         long GetTensorStride(int dim);
 
+        ITorchTensor<T> Cpu();
+
+        ITorchTensor<T> Cuda();
+
         void Backward();
 
         ITorchTensor<float> Grad();