Fix TPU testing and collect all tests

.azure/gpu-tests.yml

@@ -116,6 +116,15 @@ jobs:
       timeoutInMinutes: "35"
       condition: eq(variables['continue'], '1')
 
+    - bash: bash run_standalone_tasks.sh
+      workingDirectory: tests/tests_pytorch
+      env:
+        PL_USE_MOCKED_MNIST: "1"
+        PL_RUN_CUDA_TESTS: "1"
+      displayName: 'Testing: PyTorch standalone tasks'
+      timeoutInMinutes: "10"
+      condition: eq(variables['continue'], '1')
+
     - bash: |
         python -m coverage report
         python -m coverage xml

.circleci/config.yml

@@ -81,6 +81,8 @@ references:
        job_name=$(jsonnet -J ml-testing-accelerators/ dockers/tpu-tests/tpu_test_cases.jsonnet | kubectl create -f -) && \
        job_name=${job_name#job.batch/}
        job_name=${job_name% created}
+       pod_name=$(kubectl get po -l controller-uid=`kubectl get job $job_name -o "jsonpath={.metadata.labels.controller-uid}"` | awk 'match($0,!/NAME/) {print $1}')
+       echo "GKE pod name: $pod_name"
        echo "Waiting on kubernetes job: $job_name"
        i=0 && \
        # N checks spaced 30s apart = 900s total.
@@ -92,8 +94,6 @@ references:
        printf "Waiting for job to finish: " && \
        while [ $i -lt $MAX_CHECKS ]; do ((i++)); if kubectl get jobs $job_name -o jsonpath='Failed:{.status.failed}' | grep "Failed:1"; then status_code=1 && break; elif kubectl get jobs $job_name -o jsonpath='Succeeded:{.status.succeeded}' | grep "Succeeded:1" ; then status_code=0 && break; else printf "."; fi; sleep $CHECK_SPEEP; done && \
        echo "Done waiting. Job status code: $status_code" && \
-       pod_name=$(kubectl get po -l controller-uid=`kubectl get job $job_name -o "jsonpath={.metadata.labels.controller-uid}"` | awk 'match($0,!/NAME/) {print $1}') && \
-       echo "GKE pod name: $pod_name" && \
        kubectl logs -f $pod_name --container=train > /tmp/full_output.txt
        if grep -q '<?xml version="1.0" ?>' /tmp/full_output.txt ; then csplit /tmp/full_output.txt '/<?xml version="1.0" ?>/'; else mv /tmp/full_output.txt xx00; fi && \
        # First portion is the test logs. Print these to Github Action stdout.
@@ -106,10 +106,6 @@ references:
      name: Statistics
      command: |
        mv ./xx01 coverage.xml
-       # TODO: add human readable report
-       cat coverage.xml
-       sudo pip install pycobertura
-       pycobertura show coverage.xml
 
 jobs:
 
@@ -119,7 +115,7 @@ jobs:
     environment:
       - XLA_VER: 1.9
       - PYTHON_VER: 3.7
-      - MAX_CHECKS: 240
+      - MAX_CHECKS: 1000
       - CHECK_SPEEP: 5
     steps:
       - checkout

dockers/tpu-tests/tpu_test_cases.jsonnet

@@ -8,7 +8,7 @@ local tputests = base.BaseTest {
   mode: 'postsubmit',
   configMaps: [],
 
-  timeout: 1200, # 20 minutes, in seconds.
+  timeout: 6000, # 100 minutes, in seconds.
 
   image: 'pytorchlightning/pytorch_lightning',
   imageTag: 'base-xla-py{PYTHON_VERSION}-torch{PYTORCH_VERSION}',
@@ -34,16 +34,11 @@ local tputests = base.BaseTest {
       pip install -e .[test]
       echo $KUBE_GOOGLE_CLOUD_TPU_ENDPOINTS
       export XRT_TPU_CONFIG="tpu_worker;0;${KUBE_GOOGLE_CLOUD_TPU_ENDPOINTS:7}"
+      export PL_RUN_TPU_TESTS=1
       cd tests/tests_pytorch
-      echo $PWD
-      # TODO (@kaushikb11): Add device stats tests here
-      coverage run --source pytorch_lightning -m pytest -v --capture=no \
-          strategies/test_tpu_spawn.py \
-          profilers/test_xla_profiler.py \
-          accelerators/test_tpu.py \
-          models/test_tpu.py \
-          plugins/environments/test_xla_environment.py \
-          utilities/test_xla_device_utils.py
+      coverage run --source=pytorch_lightning -m pytest -vv --durations=0 ./
+      echo "\n||| Running standalone tests |||\n"
+      bash run_standalone_tests.sh -b 1
       test_exit_code=$?
       echo "\n||| END PYTEST LOGS |||\n"
       coverage xml

src/pytorch_lightning/plugins/training_type/single_tpu.py

@@ -18,7 +18,7 @@
 class SingleTPUPlugin(SingleTPUStrategy):
     def __init__(self, *args, **kwargs) -> None:  # type: ignore[no-untyped-def]
         rank_zero_deprecation(
-            "The `pl.plugins.training_type.single_tpu.SingleTPUPlugin` is deprecated in v1.6 and will be removed in."
+            "The `pl.plugins.training_type.single_tpu.SingleTPUPlugin` is deprecated in v1.6 and will be removed in"
             " v1.8. Use `pl.strategies.single_tpu.SingleTPUStrategy` instead."
         )
         super().__init__(*args, **kwargs)

src/pytorch_lightning/strategies/launchers/xla.py

@@ -13,10 +13,12 @@
 # limitations under the License.
 import os
 import time
+from functools import wraps
 from multiprocessing.queues import SimpleQueue
-from typing import Any, Callable, Optional, TYPE_CHECKING
+from typing import Any, Callable, Optional, Tuple, TYPE_CHECKING
 
 import torch.multiprocessing as mp
+from torch.multiprocessing import ProcessContext
 
 import pytorch_lightning as pl
 from pytorch_lightning.strategies.launchers.multiprocessing import _FakeQueue, _MultiProcessingLauncher, _WorkerOutput
@@ -26,9 +28,10 @@
 from pytorch_lightning.utilities.rank_zero import rank_zero_debug
 
 if _TPU_AVAILABLE:
+    import torch_xla.core.xla_model as xm
     import torch_xla.distributed.xla_multiprocessing as xmp
 else:
-    xm, xmp, MpDeviceLoader, rendezvous = [None] * 4
+    xm, xmp = None, None
 
 if TYPE_CHECKING:
     from pytorch_lightning.strategies import Strategy
@@ -72,7 +75,7 @@ def launch(self, function: Callable, *args: Any, trainer: Optional["pl.Trainer"]
         """
         context = mp.get_context(self._start_method)
         return_queue = context.SimpleQueue()
-        xmp.spawn(
+        _save_spawn(
             self._wrapping_function,
             args=(trainer, function, args, kwargs, return_queue),
             nprocs=len(self._strategy.parallel_devices),
@@ -103,14 +106,6 @@ def _wrapping_function(
         if self._strategy.local_rank == 0:
             return_queue.put(move_data_to_device(results, "cpu"))
 
-        # https://github.com/pytorch/xla/issues/1801#issuecomment-602799542
-        self._strategy.barrier("end-process")
-
-        # Ensure that the rank 0 process is the one exiting last
-        # https://github.com/pytorch/xla/issues/2190#issuecomment-641665358
-        if self._strategy.local_rank == 0:
-            time.sleep(2)
-
     def _collect_rank_zero_results(self, trainer: "pl.Trainer", results: Any) -> Optional["_WorkerOutput"]:
         rank_zero_debug("Collecting results from rank 0 process.")
         checkpoint_callback = trainer.checkpoint_callback
@@ -138,3 +133,30 @@ def _collect_rank_zero_results(self, trainer: "pl.Trainer", results: Any) -> Opt
         self.add_to_queue(trainer, extra)
 
         return _WorkerOutput(best_model_path, weights_path, trainer.state, results, extra)
+
+
+def _save_spawn(
+    fn: Callable,
+    args: Tuple = (),
+    nprocs: Optional[int] = None,
+    join: bool = True,
+    daemon: bool = False,
+    start_method: str = "spawn",
+) -> Optional[ProcessContext]:
+    """Wraps the :func:`torch_xla.distributed.xla_multiprocessing.spawn` with added teardown logic for the worker
+    processes."""
+
+    @wraps(fn)
+    def wrapped(rank: int, *_args: Any) -> None:
+        fn(rank, *_args)
+
+        # Make all processes wait for each other before joining
+        # https://github.com/pytorch/xla/issues/1801#issuecomment-602799542
+        xm.rendezvous("end-process")
+
+        # Ensure that the rank 0 process is the one exiting last
+        # https://github.com/pytorch/xla/issues/2190#issuecomment-641665358
+        if rank == 0:
+            time.sleep(1)
+
+    return xmp.spawn(wrapped, args=args, nprocs=nprocs, join=join, daemon=daemon, start_method=start_method)

src/pytorch_lightning/strategies/tpu_spawn.py

@@ -74,6 +74,7 @@ def __init__(
             start_method="fork",
         )
         self.debug = debug
+        self._launched = False
 
     @property
     def checkpoint_io(self) -> CheckpointIO:
@@ -90,6 +91,8 @@ def checkpoint_io(self, io: Optional[CheckpointIO]) -> None:
 
     @property
     def root_device(self) -> torch.device:
+        if not self._launched:
+            raise RuntimeError("Accessing the XLA device before processes have spawned is not allowed.")
         return xm.xla_device()
 
     @staticmethod
@@ -130,7 +133,7 @@ def setup(self, trainer: "pl.Trainer") -> None:
         self.accelerator.setup(trainer)
 
         if self.debug:
-            os.environ["PT_XLA_DEBUG"] = str(1)
+            os.environ["PT_XLA_DEBUG"] = "1"
 
         shared_params = find_shared_parameters(self.model)
         self.model_to_device()
@@ -150,8 +153,8 @@ def distributed_sampler_kwargs(self) -> Dict[str, int]:
 
     @property
     def is_distributed(self) -> bool:
-        # HOST_WORLD_SIZE is None outside the xmp.spawn process
-        return os.getenv(xenv.HOST_WORLD_SIZE, None) and self.world_size != 1
+        # HOST_WORLD_SIZE is not set outside the xmp.spawn process
+        return (xenv.HOST_WORLD_SIZE in os.environ) and self.world_size != 1
 
     def process_dataloader(self, dataloader: DataLoader) -> MpDeviceLoader:
         TPUSpawnStrategy._validate_dataloader(dataloader)
@@ -189,8 +192,9 @@ def reduce(self, output, group: Optional[Any] = None, reduce_op: Optional[Union[
         invalid_reduce_op = isinstance(reduce_op, ReduceOp) and reduce_op != ReduceOp.SUM
         invalid_reduce_op_str = isinstance(reduce_op, str) and reduce_op.lower() not in ("sum", "mean", "avg")
         if invalid_reduce_op or invalid_reduce_op_str:
-            raise MisconfigurationException(
-                "Currently, TPUSpawn Strategy only support `sum`, `mean`, `avg` reduce operation."
+            raise ValueError(
+                "Currently, the TPUSpawnStrategy only supports `sum`, `mean`, `avg` for the reduce operation, got:"
+                f" {reduce_op}"
             )
 
         output = xm.mesh_reduce("reduce", output, sum)
@@ -201,6 +205,7 @@ def reduce(self, output, group: Optional[Any] = None, reduce_op: Optional[Union[
         return output
 
     def _worker_setup(self, process_idx: int):
+        self._launched = True
         reset_seed()
         self.set_world_ranks(process_idx)
         rank_zero_only.rank = self.global_rank

tests/tests_pytorch/accelerators/test_accelerator_connector.py

@@ -671,7 +671,7 @@ def test_devices_auto_choice_mps():
 
 @pytest.mark.parametrize(
     ["parallel_devices", "accelerator"],
-    [([torch.device("cpu")], "cuda"), ([torch.device("cuda", i) for i in range(8)], ("tpu"))],
+    [([torch.device("cpu")], "cuda"), ([torch.device("cuda", i) for i in range(8)], "tpu")],
 )
 def test_parallel_devices_in_strategy_confilict_with_accelerator(parallel_devices, accelerator):
     with pytest.raises(MisconfigurationException, match=r"parallel_devices set through"):

tests/tests_pytorch/accelerators/test_ipu.py

@@ -602,7 +602,7 @@ def test_strategy_choice_ipu_plugin(tmpdir):
 
 
 @RunIf(ipu=True)
-def test_device_type_when_training_plugin_ipu_passed(tmpdir):
+def test_device_type_when_ipu_strategy_passed(tmpdir):
     trainer = Trainer(strategy=IPUStrategy(), accelerator="ipu", devices=8)
     assert isinstance(trainer.strategy, IPUStrategy)
     assert isinstance(trainer.accelerator, IPUAccelerator)

tests/tests_pytorch/accelerators/test_tpu.py

@@ -28,7 +28,6 @@
 from pytorch_lightning.strategies import DDPStrategy, TPUSpawnStrategy
 from pytorch_lightning.utilities import find_shared_parameters
 from tests_pytorch.helpers.runif import RunIf
-from tests_pytorch.helpers.utils import pl_multi_process_test
 
 
 class WeightSharingModule(BoringModel):
@@ -46,8 +45,7 @@ def forward(self, x):
         return x
 
 
-@RunIf(tpu=True)
-@pl_multi_process_test
+@RunIf(tpu=True, standalone=True)
 def test_resume_training_on_cpu(tmpdir):
     """Checks if training can be resumed from a saved checkpoint on CPU."""
     # Train a model on TPU
@@ -65,11 +63,9 @@ def test_resume_training_on_cpu(tmpdir):
     # Verify that training is resumed on CPU
     trainer = Trainer(max_epochs=1, default_root_dir=tmpdir)
     trainer.fit(model, ckpt_path=model_path)
-    assert trainer.state.finished, f"Training failed with {trainer.state}"
 
 
 @RunIf(tpu=True)
-@pl_multi_process_test
 def test_if_test_works_after_train(tmpdir):
     """Ensure that .test() works after .fit()"""
 
@@ -293,12 +289,14 @@ def test_xla_checkpoint_plugin_being_default():
     assert isinstance(trainer.strategy.checkpoint_io, XLACheckpointIO)
 
 
-@RunIf(tpu=True)
-@patch("pytorch_lightning.strategies.tpu_spawn.xm")
-def test_mp_device_dataloader_attribute(_):
+@patch("pytorch_lightning.strategies.tpu_spawn.MpDeviceLoader")
+@patch("pytorch_lightning.strategies.tpu_spawn.TPUSpawnStrategy.root_device")
+def test_mp_device_dataloader_attribute(root_device_mock, mp_loader_mock):
     dataset = RandomDataset(32, 64)
-    dataloader = TPUSpawnStrategy().process_dataloader(DataLoader(dataset))
-    assert dataloader.dataset == dataset
+    dataloader = DataLoader(dataset)
+    processed_dataloader = TPUSpawnStrategy().process_dataloader(dataloader)
+    mp_loader_mock.assert_called_with(dataloader, root_device_mock)
+    assert processed_dataloader.dataset == processed_dataloader._loader.dataset
 
 
 @RunIf(tpu=True)
@@ -307,8 +305,7 @@ def test_warning_if_tpus_not_used():
         Trainer()
 
 
-@RunIf(tpu=True)
-@pl_multi_process_test
+@RunIf(tpu=True, standalone=True)
 @pytest.mark.parametrize(
     ["devices", "expected_device_ids"],
     [

tests/tests_pytorch/callbacks/test_device_stats_monitor.py

@@ -96,7 +96,6 @@ def log_metrics(self, metrics: Dict[str, float], step: Optional[int] = None) ->
     assert cpu_stats_mock.call_count == expected
 
 
-@pytest.mark.skipif(True, reason="TODO (@kaushikb11): fix this test, timeout")
 @RunIf(tpu=True)
 def test_device_stats_monitor_tpu(tmpdir):
     """Test TPU stats are logged using a logger."""
@@ -106,24 +105,23 @@ def test_device_stats_monitor_tpu(tmpdir):
 
     class DebugLogger(CSVLogger):
         @rank_zero_only
-        def log_metrics(self, metrics: Dict[str, float], step: Optional[int] = None) -> None:
+        def log_metrics(self, metrics, step=None) -> None:
             fields = ["avg. free memory (MB)", "avg. peak memory (MB)"]
             for f in fields:
                 assert any(f in h for h in metrics)
 
     trainer = Trainer(
         default_root_dir=tmpdir,
-        max_epochs=1,
-        limit_train_batches=2,
+        max_epochs=2,
+        limit_train_batches=5,
         accelerator="tpu",
-        devices=1,
+        devices=8,
         log_every_n_steps=1,
         callbacks=[device_stats],
         logger=DebugLogger(tmpdir),
         enable_checkpointing=False,
         enable_progress_bar=False,
     )
-
     trainer.fit(model)
 
 
@@ -146,7 +144,7 @@ def test_device_stats_monitor_no_logger(tmpdir):
         trainer.fit(model)
 
 
-def test_prefix_metric_keys(tmpdir):
+def test_prefix_metric_keys():
     """Test that metric key names are converted correctly."""
     metrics = {"1": 1.0, "2": 2.0, "3": 3.0}
     prefix = "foo"

tests/tests_pytorch/conftest.py

@@ -180,6 +180,7 @@ def pytest_collection_modifyitems(items: List[pytest.Function], config: pytest.C
         min_cuda_gpus="PL_RUN_CUDA_TESTS",
         slow="PL_RUN_SLOW_TESTS",
         ipu="PL_RUN_IPU_TESTS",
+        tpu="PL_RUN_TPU_TESTS",
     )
     if os.getenv(options["standalone"], "0") == "1" and os.getenv(options["min_cuda_gpus"], "0") == "1":
         # special case: we don't have a CPU job for standalone tests, so we shouldn't run only cuda tests.

tests/tests_pytorch/deprecated_api/test_remove_1-8.py

@@ -360,12 +360,10 @@ def test_v1_8_0_deprecated_single_device_plugin_class():
         SingleDevicePlugin("cpu")
 
 
-@RunIf(tpu=True)
+@RunIf(tpu=True, standalone=True)
 def test_v1_8_0_deprecated_single_tpu_plugin_class():
     with pytest.deprecated_call(
-        match=(
-            "SingleTPUPlugin` is deprecated in v1.6 and will be removed in v1.8." " Use `.*SingleTPUStrategy` instead."
-        )
+        match="SingleTPUPlugin` is deprecated in v1.6 and will be removed in v1.8. Use `.*SingleTPUStrategy` instead."
     ):
         SingleTPUPlugin(0)
 

tests/tests_pytorch/helpers/runif.py

@@ -177,6 +177,8 @@ def __new__(
         if tpu:
             conditions.append(not _TPU_AVAILABLE)
             reasons.append("TPU")
+            # used in conftest.py::pytest_collection_modifyitems
+            kwargs["tpu"] = True
 
         if ipu:
             conditions.append(not _IPU_AVAILABLE)