Adding dispose-scope unit test for Parameter creation

Author: NiklasGustafsson

test/TorchSharpTest/TestDisposeScopesStatisticsTensor.cs

@@ -73,5 +73,26 @@ public void DisposingScopeAfterDetachingDoesNothing()
             AssertTensorCounts(0, 0, 1, 0, 0, 1, 1);
             AssertTotalsCounts(0, 0, 1, 0, 0, 1, 1);
         }
+
+        [Fact]
+        public void ParameterCreatedFromScopedTensorOnlyCountsDisposeForParameter()
+        {
+            var scope = torch.NewDisposeScope();
+            var t = torch.tensor(3.0f);
+            AssertTensorCounts(0, 0, 1, 0, 0, 0, 1);
+            var p = new TorchSharp.Modules.Parameter(t);
+            //Stats should not change when converting the tensor to a parameter
+            AssertTensorCounts(0, 0, 1, 0, 0, 0, 1);
+            t.Dispose();
+            //The tensor doesn't own the lifetime now, the parameter does, so again no change.
+            AssertTensorCounts(0, 0, 1, 0, 0, 0, 1);
+            Assert.True(t.IsInvalid);
+            Assert.False(p.IsInvalid);
+            Assert.Equal(3.0f, p.ToSingle());
+            scope.Dispose();
+            //We can count the dispose when the parameter goes away.
+            AssertTensorCounts(0, 0, 1, 1, 0, 0, 0);
+            Assert.True(p.IsInvalid);
+        }
     }
 }