在上一节，我们简单了解了命名实体识别的任务定义、应用场景及主流实现方法。本节将正式进入编码阶段，从数据处理开始，逐步构建一个完整的 NER 项目。为了清晰地构建 NER 的处理流程，我们采用流程化的代码组织思路，将整个流程拆分为多个独立的脚本。

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