Layer concatenate_1 was called with an input that isn't a symbolic tensor

問題

如題目所述，編寫代碼時遇到Layer concatenate_1 was called with an input that isn’t a symbolic tensor的問題，查看 concatenate的對象確實時tensor對象，爲什麼會有這樣的問題呢？

解決方法

查看代碼是否 concatenate的參數傳錯了。注意參數是放在【】裏面的，不是 （）。

emb_all = layers.Concatenate(axis=-1)([emb, emb_1])
emb_all = layers.concatenate([emb, emb_1], axis=-1)