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cuda_torchdiffeq_integrator.py: check if pytorch is built with cuda capabilities #2613

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cuda_torchdiffeq_integrator.py: check if pytorch is built with cuda capabilities #2613

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7 changes: 7 additions & 0 deletions python/cudaq/operator/integrators/cuda_torchdiffeq_integrator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
has_cupy = True
has_torch = True
has_torchdiffeq = True
has_torch_without_cuda = False

try:
import cupy as cp
Expand All @@ -24,6 +25,8 @@
import torch
import torch.utils
import torch.utils.dlpack
if torch.version.cuda is None:
has_torch_without_cuda = True
except ImportError:
has_torch = False

Expand All @@ -46,6 +49,10 @@ def __init__(self,
raise ImportError(
'torch and torchdiffeq are required to use Torch-based integrators.'
)
if has_torch_without_cuda:
raise ImportError(
'Please install a compatible version of PyTorch with CUDA support.'
)
if not has_torchdiffeq:
raise ImportError(
'torchdiffeq is required to use Torch-based integrators.')
Expand Down