Returns a human readable message for printing to the console.

def debug_string(self):
        """Returns a human readable message for printing to the console."""

        if self._resources_initialized:
            status = "Resources requested: {}/{} CPUs, {}/{} GPUs".format(
                self._committed_resources.cpu, self._avail_resources.cpu,
                self._committed_resources.gpu, self._avail_resources.gpu)
            customs = ", ".join([
                "{}/{} {}".format(
                    self._committed_resources.get_res_total(name),
                    self._avail_resources.get_res_total(name), name)
                for name in self._avail_resources.custom_resources
            ])
            if customs:
                status += " ({})".format(customs)
            return status
        else:
            return "Resources requested: ?"