Lib.rs

cld3-rs

Rust binding for Compact Language Detector v3 (CLD3), a neural network model for language identification.

the C++ code is from https://github.com/google/cld3

Usage

libprotobuf is required to build this crate.

let mut cld = cld3::NNetLanguageIdentifier::new(0, 500).unwrap();
let rs = cld.find_language("こんにちは");
println!("{:?}", rs.language);
// ja

Compact Language Detector v3 (CLD3)

• Model
• Supported Languages

Model

CLD3 is a neural network model for language identification. This package contains the inference code and a trained model. The inference code extracts character ngrams from the input text and computes the fraction of times each of them appears. For example, as shown in the figure below, if the input text is "banana", then one of the extracted trigrams is "ana" and the corresponding fraction is 2/4. The ngrams are hashed down to an id within a small range, and each id is represented by a dense embedding vector estimated during training.

The model averages the embeddings corresponding to each ngram type according to the fractions, and the averaged embeddings are concatenated to produce the embedding layer. The remaining components of the network are a hidden (Rectified linear) layer and a softmax layer.

To get a language prediction for the input text, we simply perform a forward pass through the network.

Supported Languages

The model outputs BCP-47-style language codes, shown in the table below. For some languages, output is differentiated by script. Language and script names from Unicode CLDR.

similar works

Natural language detection library for Rust. https://github.com/greyblake/whatlang-rs

Translation of Google's cld3 language detector into Rust. Just for fun. https://github.com/edvakf/langdetect