錯誤解決：Attempting to use uninitialized value Variable
宣告一個tensot變數,並用sess語句執行時（如上圖所示）會報如第二張圖所示錯誤，此時需要初始化所有變數，加入語句sess.run(tf.gloabl_variables_initializer())就可以。
執行成功結果如圖:
注意：只要使用tf.Variable()語法，必須先初始化變數，即
with tf.Session() as sess:
sess.run(tf.global_variables_initializer())
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