1. 找出最大数，确定最大位数d
公式： f(x)=tanh(x)=ex−e−xex+e−x
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qemu-system-x86_64 -m 8G -cpu host -smp 4 -boot d -hda vm_disk.qcow2 -netdev user,id=mynet0 -device e1000,netdev=mynet0 -serial stdio -enable-kvm