tf.Print不在控制台中打印

Question

我在控制台（而不是Jupyter笔记本）中运行TensorFlow代码，尽管我使用tf.Print，但它不会打印任何内容。用法如下：

#This is during Graph construction
                    elem = train_get_list[i]
                    img = elem[0]
                    label = elem[1]
                    img = tf.Print(img, [tf.shape(img)], "The shape of input is :")
                    elemshape.append(img)
                    net, networksummaries =  overfeataccurate(img,numclasses=1000, phase=phasecond)

会议期间的后期：

[val_accu, summaries,_] = sess.run([running_accuracy, validation_summary_op, img])

以上内容不会打印任何内容，以下内容也不会打印任何内容：

[val_accu, summaries,_] = sess.run([running_accuracy, validation_summary_op,elemshape])

我做错了什么？