/// <summary>
/// This method must be called (only) once before calling StartRun.
/// `graph` and `gpuHelper` (if useGPU is true) are initialized here.
/// If the config is invalid, it throws an error.
/// </summary>
public void Initialize()
{
if (config == null)
{
throw new InvalidOperationException("config is missing");
}
graph = new CalculatorGraph(config.text);
if (shouldUseGPU())
{
var gpuResources = new StatusOrGpuResources().ConsumeValue();
graph.SetGpuResources(gpuResources).AssertOk();
gpuHelper = new GlCalculatorHelper();
gpuHelper.InitializeForTest(graph.GetGpuResources());
}
}