Get GPU stats.

def get_device_stats(self):
        """Get GPU stats."""
        stats = []

        for index, device_handle in enumerate(self.device_handles):
            device_stats = {}
            # Dictionnary key is the GPU_ID
            device_stats['key'] = self.get_key()
            # GPU id (for multiple GPU, start at 0)
            device_stats['gpu_id'] = index
            # GPU name
            device_stats['name'] = get_device_name(device_handle)
            # Memory consumption in % (not available on all GPU)
            device_stats['mem'] = get_mem(device_handle)
            # Processor consumption in %
            device_stats['proc'] = get_proc(device_handle)
            stats.append(device_stats)

        return stats