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set device to root gpu in single GPU case #3042

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Aug 18, 2020
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set device to root gpu in single GPU case #3042

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2 changes: 2 additions & 0 deletions pytorch_lightning/accelerators/gpu_backend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.

import torch
from pytorch_lightning.core import LightningModule
from pytorch_lightning.utilities import AMPType

Expand All @@ -32,6 +33,7 @@ def setup(self, model):
# call setup
self.trainer.call_setup_hook(model)

torch.cuda.set_device(self.trainer.root_gpu)
model.cuda(self.trainer.root_gpu)

# CHOOSE OPTIMIZER
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