Fix SequenceRNN crash when running on CPU#20
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Summary
SequenceRNN crashes with
RuntimeError: Invalid device string: 'cuda:-1'when instantiated on a CPU-only machine.Problem
SequenceRNN.__init__callsself.attachToGPUs(self.gpus)after the parent constructor setsself.gpus = (-1,)for CPU. The method unconditionally buildstorch.device(f'cuda:{gpus[0]}'), producing the invalid devicecuda: -1.Fix
Branch on the GPU index before creating the device. No other generators are affecte- they use the base class
attachToGPUswhich just callsself.to(self.device).@martin-sicho