cs224u 基于远程监督的关系抽取（3）

段智华发布时间：2020-06-29 21:28:27 ，浏览量：0

- 关系抽取系列篇
- 负例
- 多标记分类
- 构建数据集

关系抽取系列篇

cs224u 基于远程监督的关系抽取（1） cs224u 基于远程监督的关系抽取（2）

负例

通过将语料库连接到知识库，我们可以为每个关系获得大量的正实例。但是分类器不能只针对正例进行训练。为了应用远程监督范式，我们还需要一些负例——即不属于任何已知关系的实体对，可以将这些实体对分配给一个名为NO_RELATION的特殊关系。我们可以通过在语料库中搜索示例来找到大量这样的对，这些示例包含两个实体，而这两个实体在知识库中不属于任何关系。

unrelated_pairs = dataset.find_unrelated_pairs(

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cs224u 基于远程监督的关系抽取（3）

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