lightning/pytorch_lightning/accelerators/__init__.py

from pytorch_lightning.accelerators.cpu_backend import CPUBackend
from pytorch_lightning.accelerators.ddp2_backend import DDP2Backend
from pytorch_lightning.accelerators.ddp_backend import DDPBackend
from pytorch_lightning.accelerators.ddp_spawn_backend import DDPSpawnBackend
from pytorch_lightning.accelerators.ddp_cpu_spawn_backend import DDPCPUSpawnBackend
from pytorch_lightning.accelerators.dp_backend import DataParallelBackend
from pytorch_lightning.accelerators.gpu_backend import GPUBackend
from pytorch_lightning.accelerators.tpu_backend import TPUBackend
from pytorch_lightning.accelerators.horovod_backend import HorovodBackend
from pytorch_lightning.accelerators.ddp_slurm_backend import DDPSLURMBackend
from pytorch_lightning.accelerators.ddp_torchelastic_backend import DDPTorchElasticBackend
from pytorch_lightning.accelerators.ddp_cpu_torchelastic_backend import DDPCPUTorchElasticBackend
from pytorch_lightning.accelerators.ddp_cpu_slurm_backend import DDPCPUSLURMBackend
from pytorch_lightning.accelerators.base_accelerator import Accelerator