异步编程是 JavaScript 开发中绕不开的核心课题：无论是 Node.js 中的文件读写、网络请求，还是浏览器端的图片加载、fetch 调用，都需要妥善管理回调、并发与错误处理。Async 是一个专门为这类场景设计的工具模块，提供了直接、强大且经过充分测试的异步流程 ...

Callback functions that can be used to track various status during epoch. 即「用于在训练过程中跟踪各类状态的回调函数」。 该模块集中提供了检查点保存、训练指标日志、速度监控、进度条等高频工具函数，开发者既可以直接使用，也可以参照其签名编写自定义回调。

一旦理解了这一点，很多 Java 特性都会更容易理解。 Callbacks、event handlers、function factories、private state、异步代码，以及一些经典的循环问题，都不会再那么神秘。 Closure 并不是加在 Java 之上的某种特殊技巧。 它是 lexical scoping + first-class functions的自然结果。

When writing JavaScript, you encounter callback functions almost every day. map, filter, addEventListener, setTimeout, Promise's then... the list goes on and on. There is a point I always keep in mind ...

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