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The dialogflow service allows using enables the use of the Google Dialogflow platform within your application.

). Dialogflow is used to translate human speech into intents (intent recognitionclassification). In other words, not only does it (try to) convert an audio stream into readable text, it also processes classifies this text into an intent (possibly with some and extracts additional parameters )called entities from the text, if specified. For example, an audio stream can translate be transcribed to the string "I am 15 years old", which is in turn converted to and classified as the intent 'answer_age' with parameter entity 'age=15'.

In order to create a Dialogflow agent, visit https://dialogflow.cloud.google.com and log-in with a Google account of choice. Use the ‘Create 'Create Agent' button at in the top left top to start your first project. For our framework to be able to communicate with this agent, the project ID and a keyfile are required. Press the settings icon next to your agent's name at the left top to see the Project ID. Click on the Project ID itself in order to generate the project, and then, in order to get the corresponding JSON keyfile, follow the steps given here.The To get a keyfile read the instructions Getting a google dialogflow key. Once you have a keyfile, place it inside the conf/dialog-flow folder in your local repository.

In Dialogflow, the main items of interest are the Intents and the Entities. An intent is something you want to recognise recognize from an end-user; here we will show you an example of an intent that is aimed at recognising recognizing someone’s name.

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When creating an intent , you can name it anything you like; In this example we go with 'answer_name' here(seen at the very top). Below 'Action and parameters', you should give the name of the intent that will actually be used in your program. Here, we also make set that to 'answer_name'.

Moreover, it is useful to set a context for the intent. A context is set by the requester in order to indicate that we only want to recognize this specific intent, and not another one. UsuallyContexts allow you to define specific states that a conversation must be in for an intent to match. You can also have intents activate contexts to help direct the conversation in future exchanges. Usually though, in a social robotics application, the kind of answer we want to get is known. We context is already known. So in this example we match the name of the (input)context with the name of the intent, and thus make it 'answer_name' as well. By default, Dialogflow makes keeps the context 'stick' active for 5 answersexchanges; but we can fix this by changing the 5 (at the start of the output context) to a 0.

Now we arrive at the most important aspect of the intent: the training phrases. Here, you can give the kinds of input strings you would expect; from these, Dialogflow learns the model it will eventually use. You can make identify a part of the phrase into as a parameter by double-clicking on the relevant word and selecting the appropriate entity from the list. It will then automatically appear below ‘Action and parameters' as well; the ‘parameter name’ there will be passed in the result (we use 'name’ ‘name’ here). The system has many built-in entities (like 'given namesys.person'), but you can define your own entities as well (even through importing CSV files). Our complete intent example thus looks like this (note: using sys.given-name is usually preferred):

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Using the Dialogflow component with Nao microphone

Let's create a simple demo that prints the transcript and the intent detected by Dialogflow.

Start by importing the necessary SIC functions:

from sic_framework.devices import Nao
from sic_framework.devices.nao import NaoqiTextToSpeechRequest
from sic_framework.services.dialogflow.dialogflow import (DialogflowConf, GetIntentRequest, RecognitionResult,
                                                          QueryResult, Dialogflow)

First, we create a connection to the Nao robot to be able to access its microphone. In order to use this intent we created earlier in an application, we need to set the language, project ID (agent name), and the keyfile. See https://bitbucket.org/socialroboticshub/docker/src/v3/sic/sic_framework/tests/demo_dialogflow.py for an example. Make sure to set your own agent name and keyfile path! keyfile and the sample rate. To do this, we create the Dialogflow configuration object. Make sure you read the documentation at the start of this page to obtain the key file for your Dialogflow project.

# connect to the robot
nao = Nao(ip='192.168.178.45')

# load the key json file
keyfile_json = json.load(open("../../conf/dialogflow/dialogflow-tutorial.json"))

# set up the config
conf = DialogflowConf(keyfile_json=keyfile_json, sample_rate_hertz=16000)

Having done this setup, we can initiate the Dialogflow object and connect the output of NaoqiMicrophone as the input of Dialogflow. The parameters ip='localhost' and conf=conf pass the ip address of the device the DialogflowComponent is running on and our configuration to be able to authenticate to Dialogflow.

# initiate Dialogflow object
dialogflow = Dialogflow(ip='localhost', conf=conf)

# connect the output of NaoqiMicrophone as the input of DialogflowComponent
dialogflow.connect(nao.mic)

Finally, we need to register a callback function to act whenever Dialogflow output is available. Whenever Dialogflow detects a new word, we will receive a RecognitionResult message. Then, on_dialog function simply prints the detected speech when it’s considered final.

# register a callback function to act upon arrival of recognition_result
dialogflow.register_callback(on_dialog)

Now we can start actually getting intents from the user! We need to set a chat ID, with which Dialogflow identifies the conversation. This can be a random number (or the same one if you want to continue a conversation). Then, we request Dialogflow to get an intent. It will start sending the Nao’s microphone audio to Dialogflow. As you start talking, the SIC on_dialog function should print the transcript in the terminal.

x = np.random.randint(10000)

for i in range(25):
    print(" ----- Conversation turn", i)
    reply = dialogflow.request(GetIntentRequest(x))

    print(reply.intent)

    if reply.fulfillment_message:
        text = reply.fulfillment_message
        print("Reply:", text)
        nao.tts.request(NaoqiTextToSpeechRequest(text))

Here is the definition for on_dialog

def on_dialog(message):
    if message.response:
        if message.response.recognition_result.is_final:
            print("Transcript:", message.response.recognition_result.transcript)

And that's it! You should now be able to talk to your robot. See also this demo script for a more complete example. Make sure to set the proper keyfile path!