首先解释一下什么叫做embedding。举个例子：地图就是对于现实地理的embedding，现实的地理地形的信息其实远远超过三维 但是地图通过颜色和等高线等来最大化表现现实的地理信息。 embedding就是用固定的维度来最大化表现原始信息。embedding可以翻译为向量或者表示。
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