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Don't throw fatal exception during 'import cudaq' if missing dependencies #1152

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Jan 31, 2024
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Don't throw fatal exception during 'import cudaq' if missing dependencies #1152

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23 changes: 20 additions & 3 deletions python/utils/LinkedLibraryHolder.cpp
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*******************************************************************************
* Copyright (c) 2022 - 2023 NVIDIA Corporation & Affiliates. *
* Copyright (c) 2022 - 2024 NVIDIA Corporation & Affiliates. *
* All rights reserved. *
* *
* This source code and the accompanying materials are made available under *
Expand Down Expand Up @@ -255,10 +255,27 @@ LinkedLibraryHolder::LinkedLibraryHolder() {

// Set the default target
// If environment variable set with a valid value, use it
// Otherwise, if GPU(s) available, set default to 'nvidia', else to 'qpp-cpu'
// Otherwise, if GPU(s) available and other dependencies are satisfied, set
// default to 'nvidia', else to 'qpp-cpu'
defaultTarget = "qpp-cpu";
if (countGPUs() > 0) {
defaultTarget = "nvidia";
// Before setting the defaultTarget to nvidia, make sure the simulator is
// available.
const std::string nvidiaTarget = "nvidia";
auto iter = targets.find(nvidiaTarget);
if (iter != targets.end()) {
auto target = iter->second;
if (std::find(availableSimulators.begin(), availableSimulators.end(),
target.simulatorName) != availableSimulators.end())
defaultTarget = nvidiaTarget;
else
cudaq::info(
"GPU(s) found but cannot select nvidia target because simulator "
"is not available. Are all dependencies installed?");
} else {
cudaq::info("GPU(s) found but cannot select nvidia target because nvidia "
"target not found.");
}
}
auto env = std::getenv("CUDAQ_DEFAULT_SIMULATOR");
if (env) {
Expand Down
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