Initialize trainer with None in DDPAccelerator

pytorch_lightning/accelerators/accelerator.py

@@ -12,14 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 from contextlib import contextmanager
-from enum import Enum
 from typing import Any, Optional, Union
 
 import torch
 import torch.distributed as torch_distrib
 from torch.optim import Optimizer
 
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.core.lightning import LightningModule
+from pytorch_lightning.plugins.ddp_plugin import DDPPlugin
 from pytorch_lightning.plugins.rpc_plugin import RPCPlugin
 from pytorch_lightning.utilities.apply_func import move_data_to_device
 from pytorch_lightning.utilities.parsing import AttributeDict
@@ -33,7 +34,10 @@ class ReduceOp:
 
 class Accelerator(object):
 
-    def __init__(self, trainer=None, cluster_environment=None, ddp_plugin=None):
+    def __init__(self,
+                 trainer: Optional = None,
+                 cluster_environment: Optional[ClusterEnvironment] = None,
+                 ddp_plugin: Optional[DDPPlugin] = None):
         self.trainer = trainer
         self.nickname = None
         self.cluster_environment = cluster_environment
@@ -254,6 +258,3 @@ def block_ddp_plugin_sync_behaviour(self):
         """
         cm = self.ddp_plugin.block_backward_sync(self.trainer.model) if self.ddp_plugin else None
         yield cm
-
-
-

pytorch_lightning/accelerators/cpu_accelerator.py

@@ -16,13 +16,14 @@
 import torch
 
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.utilities import AMPType, rank_zero_warn
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 
 
 class CPUAccelerator(Accelerator):
 
-    def __init__(self, trainer, cluster_environment=None):
+    def __init__(self, trainer, cluster_environment: Optional[ClusterEnvironment] = None):
         """
         Runs training on CPU
 

pytorch_lightning/accelerators/ddp2_accelerator.py

@@ -20,12 +20,14 @@
 
 from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.core.lightning import LightningModule
 from pytorch_lightning.core.step_result import Result
 from pytorch_lightning.distributed.dist import LightningDistributed
+from pytorch_lightning.plugins.ddp_plugin import DDPPlugin
 from pytorch_lightning.plugins.rpc_plugin import RPCPlugin
 from pytorch_lightning.utilities import HYDRA_AVAILABLE, AMPType
-from pytorch_lightning.utilities.distributed import rank_zero_only, sync_ddp_if_available, all_gather_ddp_if_available
+from pytorch_lightning.utilities.distributed import all_gather_ddp_if_available, rank_zero_only, sync_ddp_if_available
 
 if HYDRA_AVAILABLE:
     from hydra.core.hydra_config import HydraConfig
@@ -34,7 +36,10 @@
 
 class DDP2Accelerator(Accelerator):
 
-    def __init__(self, trainer, cluster_environment=None, ddp_plugin=None):
+    def __init__(self,
+                 trainer,
+                 cluster_environment: Optional[ClusterEnvironment] = None,
+                 ddp_plugin: Optional[DDPPlugin] = None):
         """
         Runs training using DDP2 strategy on a cluster
 

pytorch_lightning/accelerators/ddp_accelerator.py

@@ -25,12 +25,18 @@
 
 from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.core.lightning import LightningModule
 from pytorch_lightning.distributed.dist import LightningDistributed
+from pytorch_lightning.plugins.ddp_plugin import DDPPlugin
 from pytorch_lightning.plugins.rpc_plugin import RPCPlugin
 from pytorch_lightning.utilities import HYDRA_AVAILABLE, AMPType
-from pytorch_lightning.utilities.distributed import all_gather_ddp_if_available
-from pytorch_lightning.utilities.distributed import find_free_network_port, rank_zero_only, sync_ddp_if_available
+from pytorch_lightning.utilities.distributed import (
+    all_gather_ddp_if_available,
+    find_free_network_port,
+    rank_zero_only,
+    sync_ddp_if_available,
+)
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 from pytorch_lightning.utilities.seed import seed_everything
 
@@ -41,7 +47,10 @@
 
 class DDPAccelerator(Accelerator):
 
-    def __init__(self, trainer=None, cluster_environment=None, ddp_plugin=None):
+    def __init__(self,
+                 trainer: Optional = None,
+                 cluster_environment: Optional[ClusterEnvironment] = None,
+                 ddp_plugin: Optional[DDPPlugin] = None):
         """
         Runs training using DDP strategy on a single machine (manually, not via cluster start)
 

pytorch_lightning/accelerators/ddp_cpu_hpc_accelerator.py

@@ -11,17 +11,25 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License
+from typing import Optional
+
+from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.ddp_hpc_accelerator import DDPHPCAccelerator
+from pytorch_lightning.cluster_environments import ClusterEnvironment
+from pytorch_lightning.plugins.ddp_plugin import DDPPlugin
 from pytorch_lightning.utilities import HYDRA_AVAILABLE
 
 if HYDRA_AVAILABLE:
-    from hydra.utils import to_absolute_path, get_original_cwd
     from hydra.core.hydra_config import HydraConfig
+    from hydra.utils import get_original_cwd, to_absolute_path
 
 
 class DDPCPUHPCAccelerator(DDPHPCAccelerator):
 
-    def __init__(self, trainer, cluster_environment=None, ddp_plugin=None):
+    def __init__(self,
+                 trainer,
+                 cluster_environment: Optional[ClusterEnvironment] = None,
+                 ddp_plugin: Optional[DDPPlugin] = None):
         """
         Runs training using DDP (with CPUs) strategy on a cluster
 

pytorch_lightning/accelerators/ddp_cpu_spawn_accelerator.py

@@ -16,22 +16,23 @@
 
 import torch
 import torch.distributed as torch_distrib
-import torch.distributed as dist
 import torch.multiprocessing as mp
 from torch.nn.parallel import DistributedDataParallel
 
 from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.core.lightning import LightningModule
 from pytorch_lightning.distributed.dist import LightningDistributed
+from pytorch_lightning.plugins.ddp_plugin import DDPPlugin
 from pytorch_lightning.plugins.rpc_plugin import RPCPlugin
 from pytorch_lightning.utilities import HYDRA_AVAILABLE, AMPType
 from pytorch_lightning.utilities.distributed import (
+    all_gather_ddp_if_available,
     find_free_network_port,
     rank_zero_only,
     rank_zero_warn,
     sync_ddp_if_available,
-    all_gather_ddp_if_available,
 )
 
 if HYDRA_AVAILABLE:
@@ -41,7 +42,11 @@
 
 class DDPCPUSpawnAccelerator(Accelerator):
 
-    def __init__(self, trainer, nprocs, cluster_environment=None, ddp_plugin=None):
+    def __init__(self,
+                 trainer,
+                 nprocs: int,
+                 cluster_environment: Optional[ClusterEnvironment] = None,
+                 ddp_plugin: Optional[DDPPlugin] = None):
         """
         Runs training using DDP (on a single machine or manually on multiple machines), using mp.spawn
 
@@ -197,8 +202,8 @@ def broadcast(self, obj, src=0):
 
     def early_stopping_should_stop(self, pl_module):
         stop = torch.tensor(int(self.trainer.should_stop), device=pl_module.device)
-        dist.all_reduce(stop, op=dist.reduce_op.SUM)
-        dist.barrier()
+        torch_distrib.all_reduce(stop, op=torch_distrib.reduce_op.SUM)
+        torch_distrib.barrier()
         should_stop = stop == self.trainer.world_size
         return should_stop
 

pytorch_lightning/accelerators/ddp_hpc_accelerator.py

@@ -21,11 +21,13 @@
 
 from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.core.lightning import LightningModule
 from pytorch_lightning.distributed.dist import LightningDistributed
+from pytorch_lightning.plugins.ddp_plugin import DDPPlugin
 from pytorch_lightning.plugins.rpc_plugin import RPCPlugin
 from pytorch_lightning.utilities import HYDRA_AVAILABLE, AMPType
-from pytorch_lightning.utilities.distributed import rank_zero_only, sync_ddp_if_available, all_gather_ddp_if_available
+from pytorch_lightning.utilities.distributed import all_gather_ddp_if_available, rank_zero_only, sync_ddp_if_available
 
 if HYDRA_AVAILABLE:
     from hydra.core.hydra_config import HydraConfig
@@ -34,7 +36,10 @@
 
 class DDPHPCAccelerator(Accelerator):
 
-    def __init__(self, trainer, cluster_environment=None, ddp_plugin=None):
+    def __init__(self,
+                 trainer,
+                 cluster_environment: Optional[ClusterEnvironment] = None,
+                 ddp_plugin: Optional[DDPPlugin] = None):
         """
         Runs training using DDP on an HPC cluster
 

pytorch_lightning/accelerators/ddp_spawn_accelerator.py

@@ -17,24 +17,25 @@
 
 import torch
 import torch.distributed as torch_distrib
-import torch.distributed as dist
 import torch.multiprocessing as mp
 from torch.nn.parallel import DistributedDataParallel
 
 from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.core.lightning import LightningModule
 from pytorch_lightning.distributed import LightningDistributed
+from pytorch_lightning.plugins.ddp_plugin import DDPPlugin
 from pytorch_lightning.plugins.rpc_plugin import RPCPlugin
 from pytorch_lightning.utilities import HYDRA_AVAILABLE, AMPType
 from pytorch_lightning.utilities.cloud_io import atomic_save
 from pytorch_lightning.utilities.cloud_io import load as pl_load
 from pytorch_lightning.utilities.distributed import (
+    all_gather_ddp_if_available,
     find_free_network_port,
     rank_zero_only,
     rank_zero_warn,
     sync_ddp_if_available,
-    all_gather_ddp_if_available,
 )
 from pytorch_lightning.utilities.seed import seed_everything
 
@@ -45,7 +46,11 @@
 
 class DDPSpawnAccelerator(Accelerator):
 
-    def __init__(self, trainer, nprocs, cluster_environment=None, ddp_plugin=None):
+    def __init__(self,
+                 trainer,
+                 nprocs: int,
+                 cluster_environment: Optional[ClusterEnvironment] = None,
+                 ddp_plugin: Optional[DDPPlugin] = None):
         """
         Runs training using DDP using mp.spawn via manual launch (not cluster launch)
 
@@ -226,8 +231,8 @@ def barrier(self, name: Optional[str] = None):
 
     def early_stopping_should_stop(self, pl_module):
         stop = torch.tensor(int(self.trainer.should_stop), device=pl_module.device)
-        dist.all_reduce(stop, op=dist.reduce_op.SUM)
-        dist.barrier()
+        torch_distrib.all_reduce(stop, op=torch_distrib.reduce_op.SUM)
+        torch_distrib.barrier()
         should_stop = stop == self.trainer.world_size
         return should_stop
 

pytorch_lightning/accelerators/dp_accelerator.py

@@ -11,12 +11,14 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from typing import Union
+from typing import Optional, Union
 
 import torch
 from torch import optim
 
+from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.core.lightning import LightningModule
 from pytorch_lightning.core.step_result import Result
 from pytorch_lightning.distributed import LightningDistributed
@@ -27,7 +29,7 @@
 
 class DataParallelAccelerator(Accelerator):
 
-    def __init__(self, trainer, cluster_environment=None):
+    def __init__(self, trainer, cluster_environment: Optional[ClusterEnvironment] = None):
         """
         Runs training using DP via manual start (not HPC cluster)
 

pytorch_lightning/accelerators/gpu_accelerator.py

@@ -15,15 +15,17 @@
 
 import torch
 
+from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.distributed.dist import LightningDistributed
 from pytorch_lightning.utilities import AMPType
 
 
 class GPUAccelerator(Accelerator):
     amp_backend: AMPType
 
-    def __init__(self, trainer, cluster_environment=None):
+    def __init__(self, trainer, cluster_environment: Optional[ClusterEnvironment] = None):
         """
         Runs training using a single GPU
 

pytorch_lightning/accelerators/horovod_accelerator.py

@@ -17,7 +17,9 @@
 import torch
 from torch.optim.lr_scheduler import _LRScheduler
 
+from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.utilities import HOROVOD_AVAILABLE, AMPType
 from pytorch_lightning.utilities.distributed import rank_zero_only
 
@@ -28,7 +30,7 @@
 class HorovodAccelerator(Accelerator):
     amp_backend: AMPType
 
-    def __init__(self, trainer, cluster_environment=None):
+    def __init__(self, trainer, cluster_environment: Optional[ClusterEnvironment] = None):
         """
         Runs training using horovod
 

pytorch_lightning/accelerators/tpu_accelerator.py

@@ -22,6 +22,7 @@
 
 from pytorch_lightning import _logger as log
 from pytorch_lightning.accelerators.accelerator import Accelerator, ReduceOp
+from pytorch_lightning.cluster_environments import ClusterEnvironment
 from pytorch_lightning.core import LightningModule
 from pytorch_lightning.core.optimizer import LightningOptimizer
 from pytorch_lightning.utilities import (
@@ -43,7 +44,7 @@
 
 class TPUAccelerator(Accelerator):
 
-    def __init__(self, trainer, cluster_environment=None):
+    def __init__(self, trainer, cluster_environment: Optional[ClusterEnvironment] = None):
         """
         Runs training using TPUs (colab, single machine or pod)