强制tensorflow使用cpu

one-----------------start-------------

import tensorflow as tf
cpu=tf.config.list_physical_devices("CPU")
tf.config.set_visible_devices(cpu)
print(tf.config.list_logical_devices())

one-----------------end-------------

two-----------------start-------------

import os
os.environ["CUDA_VISIBLE_DEVICES"]="-1"
import tensorflow as tf
print(tf.config.list_logical_devices())

two-----------------end-------------