# Placeholder

### 解释

A placeholder is simply a variable that we will assign data to at a later date. It allows us to create our operations and build our computation graph, without needing the data.

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## 总结

placeholderfeed_dict={} 总是一起出现的。placeholder允许没有数据先占位创建计算图，运行时通过feed_dict传入数据。