Remove torch.jit.fuser("fuser2") in test (#7069)

* [WIP] Remove torch.jit.fuser("fuser2") in test

Internally we're considering removing support for fuser2, so we need to remove this special case from the test.

* completely remove special-casing

Author: davidberard98

test/test_ops.py

@@ -1555,13 +1555,7 @@ def test_jit(self, alpha, gamma, reduction, device, dtype, seed):
         torch.random.manual_seed(seed)
         inputs, targets = self._generate_diverse_input_target_pair(dtype=dtype, device=device)
         focal_loss = ops.sigmoid_focal_loss(inputs, targets, gamma=gamma, alpha=alpha, reduction=reduction)
-        if device == "cpu":
-            scripted_focal_loss = script_fn(inputs, targets, gamma=gamma, alpha=alpha, reduction=reduction)
-        else:
-            with torch.jit.fuser("fuser2"):
-                # Use fuser2 to prevent a bug on fuser: https://github.com/pytorch/pytorch/issues/75476
-                # We may remove this condition once the bug is resolved
-                scripted_focal_loss = script_fn(inputs, targets, gamma=gamma, alpha=alpha, reduction=reduction)
+        scripted_focal_loss = script_fn(inputs, targets, gamma=gamma, alpha=alpha, reduction=reduction)
 
         tol = 1e-3 if dtype is torch.half else 1e-5
         torch.testing.assert_close(focal_loss, scripted_focal_loss, rtol=tol, atol=tol)