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在Tensorflow 2环境下运行以下代码的时候遇到了”The Session graph is empty. Add operations to the graph before calling run()“的错误。 import tensorflow as tf a= tf.constant([1.0, 2.0, 3.0], shape=[3], name='a') b= tf.constant([1.0,2.0,3.0], shape=[3], name= 'b') c= a+ b sess