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setting PGU device #1128

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setting PGU device #1128

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5c554a1
SA: for #958: set torch cuda device when finding root
shubhamagarwal92 Mar 8, 2020
2f17b2f
SA: for #958: removing root gpu hack in trainer/evaluation_loop
shubhamagarwal92 Mar 8, 2020
6d89505
SA: setting torch cuda device
shubhamagarwal92 Mar 8, 2020
54e9a5e
comment line too long
shubhamagarwal92 Mar 8, 2020
83c291d
check if root gpu exists or available
shubhamagarwal92 Mar 9, 2020
8a66308
SA: for #958: set torch cuda device when finding root
shubhamagarwal92 Mar 8, 2020
ae30b27
SA: for #958: removing root gpu hack in trainer/evaluation_loop
shubhamagarwal92 Mar 8, 2020
67072ad
SA: setting torch cuda device
shubhamagarwal92 Mar 8, 2020
c684cc9
comment line too long
shubhamagarwal92 Mar 8, 2020
3b42a40
check if root gpu exists or available
shubhamagarwal92 Mar 9, 2020
30f0bf3
Merge branch 'master' of https://github.com/shubhamagarwal92/pytorch-…
shubhamagarwal92 Mar 12, 2020
9473303
Related to #609. Filter params for tensorboard logging.
shubhamagarwal92 Mar 12, 2020
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shubhamagarwal92 Mar 12, 2020
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Apply suggestions from code review
Borda Mar 18, 2020
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revert to master
Borda Mar 25, 2020
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revert to origin
Borda Mar 25, 2020
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4 changes: 4 additions & 0 deletions pytorch_lightning/trainer/distrib_parts.py
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Expand Up @@ -640,4 +640,8 @@ def determine_root_gpu_device(gpus):
# set root gpu
root_gpu = gpus[0]

# set cuda device to root gpu
root_device = (torch.device("cuda", root_gpu) if root_gpu >= 0 else torch.device("cpu"))
torch.cuda.set_device(root_device)

return root_gpu
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To me it looks like this should not go here, because the method is called "determine_root_gpu_device", and the added code also checks if the device is cpu. This code should probably go to the place where we call determine_root_gpu_device.

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Where do you suggest to place this?

11 changes: 10 additions & 1 deletion pytorch_lightning/trainer/evaluation_loop.py
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Expand Up @@ -421,9 +421,18 @@ def evaluation_forward(self, model, batch, batch_idx, dataloader_idx, test_mode:
# single GPU data transfer
if self.single_gpu:
# for single GPU put inputs on gpu manually
root_gpu = 0

if isinstance(self.data_parallel_device_ids, list):
root_gpu = self.data_parallel_device_ids[0]

# set cuda device to root gpu
root_device = (torch.device("cuda", root_gpu)
if root_gpu >= 0 else torch.device("cpu"))
torch.cuda.set_device(root_device)
else:
raise RuntimeError(
'Expected `data_parallel_device_ids` as a list, cannot determine root gpu.'
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Above we have if self.single_gpu, so why should device ids be a list?

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There was already an if clause:if isinstance(self.data_parallel_device_ids, list) , I raised the runtime error as a safenet because root_gpu = 0 was used earlier by default.

)
batch = self.transfer_batch_to_gpu(batch, root_gpu)
args[0] = batch

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