Rasa NLU Matcher

Rasa NLU is an open source tool for running your own NLP API for matching strings to intents. This is the recommended parser if you have privacy concerns but want the power of a full NLU parsing engine.

Rasa NLU is also trained via the API and so opsdroid can do the training for you if you provide an intents markdown file along with your skill. This file must contain headers in the format ## intent:<intent name> followed by a list of example phrases for that intent. Rasa NLU will then use those examples to build a statistical model for matching new and unseen variations on those sentences.

⚠️ Warning - Rasa NLU requires 4GB of memory, 2GB for training models and 2GB for serving requests. If you do not provide enough it will hang and cause timeouts in opsdroid.

Example 1

Skill file (__init__.py).

from opsdroid.matchers import match_rasanlu

async def hello(opsdroid, config, message):
    """Replies to user when any 'greetings' 
    intent is returned by Rasa NLU
    await message.respond("Hello there!")

Intents file (intents.md).

## intent:greetings
- Hey
- Hello
- Hi
- Hiya
- hey
- whats up
- wazzup
- heya

Note - Rasa NLU requires an intent to have at least three training examples in the list. There must also be a minimum of two intents in your file for Rasa to train.

The above skill would be called on any intent which has a name of 'greetings'.

Example 2

Skill file (__init__.py).

from opsdroid.matchers import match_rasanlu

async def my_skill(opsdroid, config, message):
    """Returns a joke if asked by the user"""
    await message.respond('What do you call a bear with no teeth? -- A gummy bear!')

Intents file (intents.md).

## intent:ask-joke
- Tell me a joke
- Say something funny
- Do you know any jokes?
- Tell me something funny
- Can you tell jokes?
- Do you know jokes?

The above skill would be called on any intent which has a name of 'ask-joke'.

Configuring opsdroid

In order to enable Rasa NLU skills, you can tell opsdroid where to find your Rasa NLU instance in the parsers section of the opsdroid configuration file. You can set the url and project parameters which default to http://localhost:5000 and opsdroid respectively.

Projects in Rasa NLU are separate areas for training and storing your intent models. This is useful as you can have multiple instances of opesdroid (or even other applications) sharing one instance of Rasa NLU if you configure them with different project names.

Rasa NLU gives you the option to set a password or token which must be provided when interacting with the API. You can optionally set this in the parser config too.

You can also set a min-score option to tell opsdroid to ignore any matches which score less than a given number between 0 and 1. The default for this is 0 which will match all messages.

  - name: rasanlu
    url: http://localhost:5000
    project: opsdroid
    token: 85769fjoso084jd
    min-score: 0.8

Message object additional parameters


An http response object which has been returned by the Rasa NLU API. This allows you to access any information from the matched intent including other entities, intents, values, etc.

Example Skill

from opsdroid.matchers import match_rasanlu

import json

async def dumpResponse(opsdroid, config, message):

Return Value on "I am looking for a Mexican restaurant in the center of town"

The example skill will print the following .

  "intent": "search_restaurant",
  "entities": {
    "cuisine" : "Mexican",
    "location" : "center"