remove AcceleratorConnector.tpu_id

pytorch_lightning/trainer/connectors/accelerator_connector.py

@@ -802,13 +802,6 @@ def tpu_cores(self) -> Optional[Union[List[int], int]]:
             return self._tpu_cores  # type: ignore
         return 0
 
-    @property
-    def tpu_id(self) -> Optional[int]:
-        if isinstance(self.accelerator, TPUAccelerator):
-            if isinstance(self._tpu_cores, list):
-                return self._tpu_cores[0]
-        return None
-
     @property
     def num_ipus(self) -> int:
         if isinstance(self.accelerator, IPUAccelerator):

tests/models/test_tpu.py

@@ -242,16 +242,6 @@ def test_dataloaders_passed_to_fit(tmpdir):
     assert trainer.state.finished, f"Training failed with {trainer.state}"
 
 
-@pytest.mark.parametrize(
-    ["tpu_cores", "expected_tpu_id"],
-    [(1, None), (8, None), ([1], 1), ([8], 8)],
-)
-@RunIf(tpu=True)
-def test_tpu_id_to_be_as_expected(tpu_cores, expected_tpu_id):
-    """Test if trainer.tpu_id is set as expected."""
-    assert Trainer(tpu_cores=tpu_cores)._accelerator_connector.tpu_id == expected_tpu_id
-
-
 def test_tpu_misconfiguration():
     """Test if trainer.tpu_id is set as expected."""
     with pytest.raises(MisconfigurationException, match="`tpu_cores` can only be"):