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Addresses issue #730 . By default, config.hpp sets
int ngpu = -1;
but we have the following method
static inline bool gpuDisabled() { return Get().ngpu == 0; } which will return false if ngpu doesn't get overwritten to 0. A possible fix is to change the gpuDisabled criteria to
static inline bool gpuDisabled() { return Get().ngpu < 0; }