Revert "Update ddp_spawn.py"

This reverts commit f172101.

Author: shuyingsunshine21

pytorch_lightning/plugins/training_type/ddp_spawn.py

@@ -21,6 +21,7 @@
 import torch.multiprocessing as mp
 from torch.nn.parallel.distributed import DistributedDataParallel
 from torch.optim import Optimizer
+import numpy
 
 from pytorch_lightning.distributed.dist import LightningDistributed
 from pytorch_lightning.overrides import LightningDistributedModule
@@ -78,6 +79,7 @@ def distributed_sampler_kwargs(self):
 
     def setup(self, model):
         os.environ["MASTER_PORT"] = str(self.cluster_environment.master_port())
+        os.environ["MKL_SERVICE_FORCE_INTEL"] = "1"
 
         # pass in a state q
         smp = mp.get_context("spawn")