Testing stuff. --henritns
If you're looking for the version 3 docs, you can find them here Version 3
"NLP.js" is a general natural language utility for nodejs. Currently supporting:
- Guess the language of a phrase
- Fast Levenshtein distance of two strings
- Search the best substring of a string with less Levenshtein distance to a given pattern.
- Get stemmers and tokenizers for several languages.
- Sentiment Analysis for phrases (with negation support).
- Named Entity Recognition and management, multi-language support, and acceptance of similar strings, so the introduced text does not need to be exact.
- Natural Language Processing Classifier, to classify an utterance into intents.
- NLP Manager: a tool able to manage several languages, the Named Entities for each language, the utterances, and intents for the training of the classifier, and for a given utterance return the entity extraction, the intent classification and the sentiment analysis. Also, it is able to maintain a Natural Language Generation Manager for the answers.
- 40 languages natively supported, 104 languages supported with BERT integration
- Any other language is supported through tokenization, even fantasy languages
Version 4 is very different from previous versions. Before this version, NLP.js was a monolithic library. The big changes:
- Now the library is split into small independent packages.
- So every language has its own package
- It provides a plugin system, so you can provide your own plugins or replace the existing ones.
- It provides a container system for the plugins, settings for the plugins and also pipelines
- A pipeline is code defining how the plugins interact. Usually it is linear: there is an input into the plugin, and this generates the input for the next one. As an example, the preparation of a utterance (the process to convert the utterance to a hashmap of stemmed features) is now a pipeline like this:
normalize -> tokenize -> removeStopwords -> stem -> arrToObj
- There is a simple compiler for the pipelines, but they can also be built using a modified version of javascript and python (compilers are also included as plugins, so other languages can be added as a plugin).
- NLP.js now includes connectors, a connector is understood to be something that has at least 2 methods:
hear
andsay
. Examples of connectors included: Console Connector, Microsoft Bot Framework Connector and a Direct Line Offline Connector (this one allows you to build a web chatbot using the Microsoft Webchat, but without having to deploy anything in Azure). - Some plugins can be registered by language, so for different languages different plugins will be used. Also some plugins, like NLU, can be registered not only by language but also by domain (a functional set of intents that can be trained separately)
- As an example of per-language/domain plugins, a Microsoft LUIS NLU plugin is provided. You can configure your chatbot to use the NLU from NLP.js for some languages/domains, and LUIS for other languages/domains.
- Having plugins and pipelines makes it possible to write chatbots by only modifying the configuration and the pipelines file, without modifying the code.
- Installation
- QuickStart
- Install the library
- Create the code
- Extracting the corpus into a file
- Extracting the configuration into a file
- Creating your first pipeline
- Console Connector
- Extending your bot with the pipeline
- Adding multiple languages
- Adding API and WebChat
- Using Microsoft Bot Framework
- Recognizing the bot name and the channel
- One bot per connector
- Different port for Microsoft Bot Framework and Webchat
- Adding logic to an intent
- Web and React Native
- QnA
- NER Quickstart
- NeuralNetwork
- Logger
- @nlpjs/emoji
- @nlpjs/console-connector
- @nlpjs/similarity
- @nlpjs/nlu
- React Native
- Example of use
- False Positives
- Log Training Progress
- Benchmarking
- Language Support
- Language Guesser
- Similar Search
- NLU
- NER Manager
- Integration with Duckling
- Builtin Entity Extraction
- Sentiment Analysis
- NLP Manager
- Slot Filling
- Loading from Excel
- Microsoft Bot Framework
- Languages
- Contributing
- Contributors
- Code of Conduct
- Who is behind it
- License
If you're looking to use NLP.js in your Node application, you can install via NPM like so:
npm install node-nlp
There is a version of NLP.js that works in React Native, so you can build chatbots that can be trained and executed on the mobile even without the internet. You can install it via NPM:
npm install node-nlp-rn
Some limitations:
- No Chinese
- The Japanese stemmer is not the complete one
- No Excel import
- No loading from a file, or saving to a file, but it can still import from JSON and export to JSON.
You can see a great example of use in the folder /examples/02-qna-classic
. This example is able to train the bot and save the model to a file, so when the bot is started again, the model is loaded instead of being trained again.
You can start to build your NLP from scratch with a few lines:
const { NlpManager } = require("node-nlp")
const manager = new NlpManager({ languages: ["en"], forceNER: true })
// Adds the utterances and intents for the NLP
manager.addDocument("en", "goodbye for now", "greetings.bye")
manager.addDocument("en", "bye bye take care", "greetings.bye")
manager.addDocument("en", "okay see you later", "greetings.bye")
manager.addDocument("en", "bye for now", "greetings.bye")
manager.addDocument("en", "i must go", "greetings.bye")
manager.addDocument("en", "hello", "greetings.hello")
manager.addDocument("en", "hi", "greetings.hello")
manager.addDocument("en", "howdy", "greetings.hello")
// Train also the NLG
manager.addAnswer("en", "greetings.bye", "Till next time")
manager.addAnswer("en", "greetings.bye", "see you soon!")
manager.addAnswer("en", "greetings.hello", "Hey there!")
manager.addAnswer("en", "greetings.hello", "Greetings!")
// Train and save the model.
;(async () => {
await manager.train()
manager.save()
const response = await manager.process("en", "I should go now")
console.log(response)
})()
This produces the following result in a console:
{ utterance: 'I should go now',
locale: 'en',
languageGuessed: false,
localeIso2: 'en',
language: 'English',
domain: 'default',
classifications:
[ { label: 'greetings.bye', value: 0.698219120207268 },
{ label: 'None', value: 0.30178087979273216 },
{ label: 'greetings.hello', value: 0 } ],
intent: 'greetings.bye',
score: 0.698219120207268,
entities:
[ { start: 12,
end: 14,
len: 3,
accuracy: 0.95,
sourceText: 'now',
utteranceText: 'now',
entity: 'datetime',
resolution: [Object] } ],
sentiment:
{ score: 1,
comparative: 0.25,
vote: 'positive',
numWords: 4,
numHits: 2,
type: 'senticon',
language: 'en' },
actions: [],
srcAnswer: 'Till next time',
answer: 'Till next time' }
By default, the neural network tries to avoid false positives. To achieve that, one of the internal processes is that words never seen by the network are represented as a feature that gives some weight to the None
intent. So, if you try the previous example with "I have to go" it will return the None
intent because 2 of the 4 words have never been seen while training.
If you don't want to avoid those false positives, and you feel more comfortable with classifications into the intents that you declare, then you can disable this behavior by setting the useNoneFeature
to false:
const manager = new NlpManager({
languages: ["en"],
nlu: { useNoneFeature: false },
})
You can also add a log progress, so you can trace what is happening during the training. You can log the progress to the console:
const nlpManager = new NlpManager({ languages: ["en"], nlu: { log: true } })
Or you can provide your own log function:
const logfn = (status, time) => console.log(status, time)
const nlpManager = new NlpManager({ languages: ["en"], nlu: { log: logfn } })
You can read the guide for how to contribute at Contributing.
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You can read the Code of Conduct at Code of Conduct.
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