几乎可以确定，斯坦福大学COreNLP目前没有语言标识. '几乎'-因为不存在很难证明.

Almost certainly there is no language identification in Stanford COreNLP at this moment. 'almost' - because nonexistence is much harder to prove.

不过，以下是间接证据:

Nevertheless, below are circumstantial evidences:

1. 在主要 页，也没有 CoreNLP页，也没有在 2014 CoreNLP作者的论文；
结合了多个NLP库的
2. 工具 包括Stanford CoreNLP，请使用另一个lib作为语言 标识，例如 DKPro Core ASL ；还其他 谈论语言识别和CoreNLP的用户没有提及此功能
3. CoreNLP的源文件包含Language 类，但与语言识别无关-您可以 手动检查所有84个出现的语言"单词

1. there is no mention of language identification neither on main page, nor CoreNLP page, nor in FAQ (although there is a question 'How do I run CoreNLP on other languages?'), nor in 2014 paper of CoreNLP's authors;
2. tools that combine several NLP libs including Stanford CoreNLP use another lib for language identification, for example DKPro Core ASL; also other users talking about language identification and CoreNLP don't mention this capability
3. source file of CoreNLP contains Language classes, but nothing related to language identification - you can check manually for all 84 occurrence of 'language' word here

尝试 TIKA 或 Java语言检测库(他们报告"53种语言的精度提高了99％").

Try TIKA, or TextCat, or Language Detection Library for Java (they report "99% over precision for 53 languages").

通常，质量取决于输入文本的大小:如果输入文本足够长(例如，至少几个单词并且没有特别选择)，则精度可以很好-约为95％.

In general, quality depends on the size of input text: if it is long enough (say, at least several words and not specially chosen), then precision can be pretty good - about 95%.