Remove Trainer._device_type

pytorch_lightning/callbacks/xla_stats_monitor.py

@@ -21,8 +21,9 @@
 import time
 
 import pytorch_lightning as pl
+from pytorch_lightning.accelerators import TPUAccelerator
 from pytorch_lightning.callbacks.base import Callback
-from pytorch_lightning.utilities import _AcceleratorType, _TPU_AVAILABLE
+from pytorch_lightning.utilities import _TPU_AVAILABLE
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 from pytorch_lightning.utilities.rank_zero import rank_zero_deprecation, rank_zero_info
 
@@ -72,7 +73,7 @@ def on_train_start(self, trainer: "pl.Trainer", pl_module: "pl.LightningModule")
         if not trainer.logger:
             raise MisconfigurationException("Cannot use XLAStatsMonitor callback with Trainer that has no logger.")
 
-        if trainer._device_type != _AcceleratorType.TPU:
+        if isinstance(trainer.accelerator, TPUAccelerator):
             raise MisconfigurationException(
                 "You are using XLAStatsMonitor but are not running on TPU"
                 f" since `tpu_cores` attribute in Trainer is set to {trainer.tpu_cores}."

pytorch_lightning/core/lightning.py

@@ -95,8 +95,6 @@ def __init__(self, *args: Any, **kwargs: Any) -> None:
         # pointer to the trainer object
         self.trainer = None
 
-        self._device_type = None
-
         # true if using amp
         self.use_amp: bool = False
 

pytorch_lightning/loops/optimization/optimizer_loop.py

@@ -19,6 +19,7 @@
 from torch import Tensor
 from torch.optim import Optimizer
 
+from pytorch_lightning.accelerators import TPUAccelerator
 from pytorch_lightning.core.optimizer import LightningOptimizer
 from pytorch_lightning.loops import Loop
 from pytorch_lightning.loops.optimization.closure import AbstractClosure, OutputResult
@@ -29,10 +30,9 @@
     check_finite_loss,
 )
 from pytorch_lightning.trainer.progress import OptimizationProgress
-from pytorch_lightning.utilities import _AcceleratorType, AMPType
+from pytorch_lightning.utilities import AMPType
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 from pytorch_lightning.utilities.finite_checks import detect_nan_parameters
-from pytorch_lightning.utilities.imports import _TPU_AVAILABLE
 from pytorch_lightning.utilities.types import STEP_OUTPUT
 from pytorch_lightning.utilities.warnings import WarningCache
 
@@ -369,7 +369,7 @@ def _optimizer_step(
             optimizer,
             opt_idx,
             train_step_and_backward_closure,
-            on_tpu=(self.trainer._device_type == _AcceleratorType.TPU and _TPU_AVAILABLE),
+            on_tpu=isinstance(self.trainer.accelerator, TPUAccelerator),
             using_native_amp=(self.trainer.amp_backend == AMPType.NATIVE),
             using_lbfgs=is_lbfgs,
         )

pytorch_lightning/trainer/connectors/logger_connector/logger_connector.py

@@ -16,11 +16,12 @@
 import torch
 
 import pytorch_lightning as pl
+from pytorch_lightning.accelerators import GPUAccelerator
 from pytorch_lightning.loggers import LightningLoggerBase, LoggerCollection, TensorBoardLogger
 from pytorch_lightning.plugins.environments.slurm_environment import SLURMEnvironment
 from pytorch_lightning.trainer.connectors.logger_connector.result import _METRICS, _OUT_DICT, _PBAR_DICT
 from pytorch_lightning.trainer.states import RunningStage
-from pytorch_lightning.utilities import _AcceleratorType, memory
+from pytorch_lightning.utilities import memory
 from pytorch_lightning.utilities.apply_func import apply_to_collection, move_data_to_device
 from pytorch_lightning.utilities.metrics import metrics_to_scalars
 from pytorch_lightning.utilities.model_helpers import is_overridden
@@ -305,7 +306,7 @@ def gpus_metrics(self) -> Dict[str, float]:
         .. deprecated:: v1.5
             Will be removed in v1.7.
         """
-        if self.trainer._device_type == _AcceleratorType.GPU and self.log_gpu_memory:
+        if isinstance(self.trainer.accelerator, GPUAccelerator) and self.log_gpu_memory:
             mem_map = memory.get_memory_profile(self.log_gpu_memory)
             self._gpus_metrics.update(mem_map)
         return self._gpus_metrics

pytorch_lightning/trainer/trainer.py

@@ -30,7 +30,7 @@
 from torch.utils.data import DataLoader
 
 import pytorch_lightning as pl
-from pytorch_lightning.accelerators import Accelerator, IPUAccelerator
+from pytorch_lightning.accelerators import Accelerator, GPUAccelerator, IPUAccelerator, TPUAccelerator
 from pytorch_lightning.callbacks import Callback, EarlyStopping, ModelCheckpoint, ProgressBarBase
 from pytorch_lightning.callbacks.prediction_writer import BasePredictionWriter
 from pytorch_lightning.core.datamodule import LightningDataModule
@@ -75,7 +75,6 @@
 from pytorch_lightning.tuner.lr_finder import _LRFinder
 from pytorch_lightning.tuner.tuning import Tuner
 from pytorch_lightning.utilities import (
-    _AcceleratorType,
     _IPU_AVAILABLE,
     _TPU_AVAILABLE,
     AMPType,
@@ -1718,33 +1717,31 @@ def __setup_profiler(self) -> None:
         self.profiler.setup(stage=self.state.fn._setup_fn, local_rank=local_rank, log_dir=self.log_dir)
 
     def _log_device_info(self) -> None:
-        rank_zero_info(f"GPU available: {torch.cuda.is_available()}, used: {self._device_type == _AcceleratorType.GPU}")
+        rank_zero_info(
+            f"GPU available: {torch.cuda.is_available()}, used: {isinstance(self.accelerator, GPUAccelerator)}"
+        )
 
         num_tpu_cores = (
-            self.tpu_cores if self.tpu_cores is not None and self._device_type == _AcceleratorType.TPU else 0
+            self.tpu_cores if self.tpu_cores is not None and isinstance(self.accelerator, TPUAccelerator) else 0
         )
         rank_zero_info(f"TPU available: {_TPU_AVAILABLE}, using: {num_tpu_cores} TPU cores")
 
         num_ipus = self.ipus if self.ipus is not None else 0
         rank_zero_info(f"IPU available: {_IPU_AVAILABLE}, using: {num_ipus} IPUs")
 
-        if torch.cuda.is_available() and self._device_type != _AcceleratorType.GPU:
+        if torch.cuda.is_available() and not isinstance(self.accelerator, GPUAccelerator):
             rank_zero_warn(
                 "GPU available but not used. Set the gpus flag in your trainer `Trainer(gpus=1)` or script `--gpus=1`.",
                 category=PossibleUserWarning,
             )
 
-        if _TPU_AVAILABLE and self._device_type != _AcceleratorType.TPU:
+        if _TPU_AVAILABLE and not isinstance(self.accelerator, TPUAccelerator):
             rank_zero_warn(
                 "TPU available but not used. Set the `tpu_cores` flag in your trainer"
                 " `Trainer(tpu_cores=8)` or script `--tpu_cores=8`."
             )
 
-        if (
-            _IPU_AVAILABLE
-            and self._device_type != _AcceleratorType.IPU
-            and not isinstance(self.accelerator, IPUAccelerator)
-        ):
+        if _IPU_AVAILABLE and not isinstance(self.accelerator, IPUAccelerator):
             rank_zero_warn(
                 "IPU available but not used. Set the `ipus` flag in your trainer"
                 " `Trainer(ipus=8)` or script `--ipus=8`."
@@ -1964,10 +1961,6 @@ def should_rank_save_checkpoint(self) -> bool:
             isinstance(strategy, pl.strategies.TPUSpawnStrategy) and strategy.local_rank == 0 or strategy.is_global_zero
         )
 
-    @property
-    def _device_type(self) -> _AcceleratorType:
-        return self._accelerator_connector.device_type
-
     @property
     def num_nodes(self) -> int:
         return self._accelerator_connector.num_nodes

tests/accelerators/test_accelerator_connector.py

@@ -42,7 +42,6 @@
     ParallelStrategy,
     SingleDeviceStrategy,
 )
-from pytorch_lightning.utilities import _AcceleratorType
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 from tests.helpers.runif import RunIf
 
@@ -447,10 +446,7 @@ def test_accelerator_choice_multi_node_gpu(
 
 @mock.patch("torch.cuda.is_available", return_value=False)
 def test_accelerator_cpu(_):
-
     trainer = Trainer(accelerator="cpu")
-
-    assert trainer._device_type == "cpu"
     assert isinstance(trainer.accelerator, CPUAccelerator)
 
     with pytest.raises(MisconfigurationException, match="You requested gpu:"):
@@ -464,36 +460,25 @@ def test_accelerator_cpu(_):
 
 @RunIf(min_gpus=1)
 def test_accelerator_gpu():
-
     trainer = Trainer(accelerator="gpu", gpus=1)
-
-    assert trainer._device_type == "gpu"
     assert isinstance(trainer.accelerator, GPUAccelerator)
 
     trainer = Trainer(accelerator="gpu")
     assert isinstance(trainer.accelerator, GPUAccelerator)
 
     trainer = Trainer(accelerator="auto", gpus=1)
-
-    assert trainer._device_type == "gpu"
     assert isinstance(trainer.accelerator, GPUAccelerator)
 
 
 @RunIf(min_gpus=1)
 def test_accelerator_cpu_with_gpus_flag():
-
     trainer = Trainer(accelerator="cpu", gpus=1)
-
-    assert trainer._device_type == "cpu"
     assert isinstance(trainer.accelerator, CPUAccelerator)
 
 
 @RunIf(min_gpus=2)
 def test_accelerator_cpu_with_multiple_gpus():
-
     trainer = Trainer(accelerator="cpu", gpus=2)
-
-    assert trainer._device_type == "cpu"
     assert isinstance(trainer.accelerator, CPUAccelerator)
 
 
@@ -532,10 +517,8 @@ def test_accelerator_gpu_with_devices(devices, plugin):
 
 @RunIf(min_gpus=1)
 def test_accelerator_auto_with_devices_gpu():
-
     trainer = Trainer(accelerator="auto", devices=1)
-
-    assert trainer._device_type == "gpu"
+    assert isinstance(trainer.accelerator, GPUAccelerator)
     assert trainer.gpus == 1
 
 
@@ -662,10 +645,8 @@ def test_strategy_choice_gpu_plugin(tmpdir, plugin):
 @RunIf(min_gpus=2)
 @pytest.mark.parametrize("plugin", [DDPSpawnStrategy, DDPStrategy])
 def test_device_type_when_training_plugin_gpu_passed(tmpdir, plugin):
-
     trainer = Trainer(strategy=plugin(), gpus=2)
     assert isinstance(trainer.strategy, plugin)
-    assert trainer._device_type == _AcceleratorType.GPU
     assert isinstance(trainer.accelerator, GPUAccelerator)
 
 

tests/accelerators/test_ipu.py

@@ -25,7 +25,7 @@
 from pytorch_lightning.strategies.ipu import IPUStrategy
 from pytorch_lightning.trainer.states import RunningStage, TrainerFn
 from pytorch_lightning.trainer.supporters import CombinedLoader
-from pytorch_lightning.utilities import _AcceleratorType, _IPU_AVAILABLE
+from pytorch_lightning.utilities import _IPU_AVAILABLE
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 from tests.helpers.boring_model import BoringModel
 from tests.helpers.datamodules import ClassifDataModule
@@ -499,27 +499,19 @@ def test_precision_plugin(tmpdir):
 
 @RunIf(ipu=True)
 def test_accelerator_ipu():
-
     trainer = Trainer(accelerator="ipu", ipus=1)
-
-    assert trainer._device_type == "ipu"
     assert isinstance(trainer.accelerator, IPUAccelerator)
 
     trainer = Trainer(accelerator="ipu")
     assert isinstance(trainer.accelerator, IPUAccelerator)
 
     trainer = Trainer(accelerator="auto", ipus=8)
-
-    assert trainer._device_type == "ipu"
     assert isinstance(trainer.accelerator, IPUAccelerator)
 
 
 @RunIf(ipu=True)
 def test_accelerator_cpu_with_ipus_flag():
-
     trainer = Trainer(accelerator="cpu", ipus=1)
-
-    assert trainer._device_type == "cpu"
     assert isinstance(trainer.accelerator, CPUAccelerator)
 
 
@@ -535,10 +527,8 @@ def test_accelerator_ipu_with_devices():
 
 @RunIf(ipu=True)
 def test_accelerator_auto_with_devices_ipu():
-
     trainer = Trainer(accelerator="auto", devices=8)
-
-    assert trainer._device_type == "ipu"
+    assert isinstance(trainer.accelerator, IPUAccelerator)
     assert trainer.ipus == 8
 
 
@@ -568,10 +558,8 @@ def test_strategy_choice_ipu_plugin(tmpdir):
 
 @RunIf(ipu=True)
 def test_device_type_when_training_plugin_ipu_passed(tmpdir):
-
     trainer = Trainer(strategy=IPUStrategy(), ipus=8)
     assert isinstance(trainer.strategy, IPUStrategy)
-    assert trainer._device_type == _AcceleratorType.IPU
     assert isinstance(trainer.accelerator, IPUAccelerator)
 
 

tests/accelerators/test_tpu.py

@@ -81,53 +81,27 @@ def test_if_test_works_after_train(tmpdir):
     assert len(trainer.test(model)) == 1
 
 
-@RunIf(tpu=True)
-def test_accelerator_tpu():
-    assert TPUAccelerator.is_available()
-
-    trainer = Trainer(accelerator="tpu", tpu_cores=8)
-
-    assert trainer._device_type == "tpu"
-    assert isinstance(trainer.accelerator, TPUAccelerator)
-
-    trainer = Trainer(accelerator="tpu")
-    assert isinstance(trainer.accelerator, TPUAccelerator)
-
-
 @RunIf(tpu=True)
 def test_accelerator_cpu_with_tpu_cores_flag():
+    assert TPUAccelerator.is_available()
 
     trainer = Trainer(accelerator="cpu", tpu_cores=8)
-
-    assert trainer._device_type == "cpu"
     assert isinstance(trainer.accelerator, CPUAccelerator)
 
-
-@RunIf(tpu=True)
-def test_accelerator_tpu_with_auto():
-
-    trainer = Trainer(accelerator="auto", tpu_cores=8)
-
-    assert trainer._device_type == "tpu"
+    trainer = Trainer(accelerator="tpu", tpu_cores=8)
     assert isinstance(trainer.accelerator, TPUAccelerator)
-
-
-@RunIf(tpu=True)
-def test_accelerator_tpu_with_devices():
-
-    trainer = Trainer(accelerator="tpu", devices=8)
-
-    assert trainer.tpu_cores == 8
     assert isinstance(trainer.strategy, TPUSpawnStrategy)
-    assert isinstance(trainer.accelerator, TPUAccelerator)
 
 
 @RunIf(tpu=True)
-def test_accelerator_auto_with_devices_tpu():
-
-    trainer = Trainer(accelerator="auto", devices=8)
+@pytest.mark.parametrize(["accelerator", "devices"], [("auto", 8), ("auto", "auto"), ("tpu", None)])
+def test_accelerator_tpu(accelerator, devices):
+    assert TPUAccelerator.is_available()
 
-    assert trainer._device_type == "tpu"
+    trainer = Trainer(accelerator=accelerator, devices=devices)
+    assert isinstance(trainer.accelerator, TPUAccelerator)
+    assert isinstance(trainer.strategy, TPUSpawnStrategy)
+    assert trainer.devices == 8
     assert trainer.tpu_cores == 8
 
 
@@ -328,10 +302,3 @@ def test_mp_device_dataloader_attribute(_):
     dataset = RandomDataset(32, 64)
     dataloader = TPUSpawnStrategy().process_dataloader(DataLoader(dataset))
     assert dataloader.dataset == dataset
-
-
-@RunIf(tpu=True)
-def test_devices_auto_choice_tpu():
-    trainer = Trainer(accelerator="auto", devices="auto")
-    assert trainer.devices == 8
-    assert trainer.tpu_cores == 8

tests/models/test_tpu.py

@@ -26,7 +26,7 @@
 from pytorch_lightning.callbacks import EarlyStopping
 from pytorch_lightning.strategies import TPUSpawnStrategy
 from pytorch_lightning.trainer.connectors.logger_connector.result import _Sync
-from pytorch_lightning.utilities import _AcceleratorType, _TPU_AVAILABLE
+from pytorch_lightning.utilities import _TPU_AVAILABLE
 from pytorch_lightning.utilities.distributed import ReduceOp
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 from tests.helpers import BoringModel, RandomDataset
@@ -469,8 +469,6 @@ def teardown(self, stage):
 @RunIf(tpu=True)
 @pl_multi_process_test
 def test_device_type_when_training_plugin_tpu_passed(tmpdir):
-
     trainer = Trainer(strategy=TPUSpawnStrategy(), tpu_cores=8)
     assert isinstance(trainer.strategy, TPUSpawnStrategy)
-    assert trainer._device_type == _AcceleratorType.TPU
     assert isinstance(trainer.accelerator, TPUAccelerator)