Its a file recognizer of Sphinx4

ANTLR—Another Tool for Language Recognition，其前身是PCCTS，它为包括Java，C++，C#在内的语言提供了一个通过语法描述来自动构造自定义语言的识别器（recognizer），编译器（parser）和解释器（translator）的框架。ANTLR可以通过断言（Predicate）解决识别冲突；支持动作（Action）和返回值（Return Value）来；更棒的是，它可以根据输入自动生成语法树并可视化的显示出来（这一点我将在下面的例子中演示）。由

This class provides a base class for recognition service implementations. This class should be extended only in case you wish to implement a new speech recognizer. Please note that the implementation of this service is stateless.

The $1 Unistroke Recognizer is a 2-D single-stroke recognizer designed for rapid prototyping of gesture-based user interfaces. In machine learning terms, $1 is an instance-based nearest-neighbor classifier with a Euclidean scoring function, i.e., a g