use is instead of isinstance

Author: sdaulton

gpytorch/constraints/constraints.py

@@ -32,7 +32,7 @@ def __init__(self, lower_bound, upper_bound, transform=sigmoid, inv_transform=in
         if torch.any(torch.ge(lower_bound, upper_bound)):
             raise ValueError("Got parameter bounds with empty intervals.")
 
-        if isinstance(self, Interval):
+        if type(self) is Interval:
             max_bound = torch.max(upper_bound)
             min_bound = torch.min(lower_bound)
             if max_bound == math.inf or min_bound == -math.inf:

gpytorch/test/base_test_case.py

@@ -58,7 +58,7 @@ def assertEqual(self, item1, item2):
             raise AssertionError(f"item1 ({type(item1)}) and item2 ({type(item2)}) are not the same type.")
         elif item1 == item2:
             return True
-        elif isinstance(item1, type(item2)):
+        elif type(item1) is type(item2):
             raise AssertionError(f"item1 ({type(item1)}) and item2 ({type(item2)}) are not the same type.")
         else:
             raise AssertionError(f"tensor1 ({item1}) does not equal tensor2 ({item2}).")