Is there a possibility to integrate Translation before/after Amazon Lex Bot?

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I have built a Q&A-chatbot using Amazon Lex with all intents and its utterances being in English. Now of course when an user asks some question in English, Amazon Lex processes the question and gives an answer in English. Now I also want to make it possible for example using Amazon Translate to have a possibility for other language interactions. That means: e.g. French user asks a question in French, Amazon Translate translates it into English and automatically forwards it to Amazon Lex, where the procedure just continues as before. The answers, which are triggered by the lambda function, are in English so when answering Amazon Translate should take the English answer text, translate it back into French and return it to the user.

Is there a proper tutorial on that as the Tutorials by Amazon seem to be just general information. Or is there a simple button I can click on and Amazon Translate is already ready to go ;)

Thanks for your answers in advance!

amazon-translate amazon-lex aws-lambda translation amazon-web-services
1 Answers

Using the AWS SDK, you can build this functionality. You can use Amazon Comprehend to determine the language. If it's french (or other supported language), pass the string to the AWS Translate service to get English.

This is a multi service use case that requires code. I programmed an example web app by using the AWS SDK For Java that performs this use case perfectly.

This Java code uses Amazon LEX, Comprehend, and the AWS Translation to solve this use case. As you can see, this handles French and other languages.

enter image description here

This example handles other languages too such as Italian:

enter image description here

Here is the Java V2 code that solves this. Note that the text is posted from the HTML client to the controller and the controller calls the getText method and passes the text.

import software.amazon.awssdk.auth.credentials.EnvironmentVariableCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.lexruntime.LexRuntimeClient;
import org.springframework.stereotype.Component;
import software.amazon.awssdk.services.lexruntime.model.LexRuntimeException;
import software.amazon.awssdk.services.lexruntime.model.PostTextRequest;
import software.amazon.awssdk.services.comprehend.ComprehendClient;
import software.amazon.awssdk.services.comprehend.model.ComprehendException;
import software.amazon.awssdk.services.comprehend.model.DetectDominantLanguageRequest;
import software.amazon.awssdk.services.comprehend.model.DetectDominantLanguageResponse;
import software.amazon.awssdk.services.comprehend.model.DominantLanguage;
import software.amazon.awssdk.services.translate.TranslateClient;
import software.amazon.awssdk.services.translate.model.TranslateTextRequest;
import software.amazon.awssdk.services.translate.model.TranslateTextResponse;
import software.amazon.awssdk.services.translate.model.TranslateException;
import java.util.*;
import java.text.SimpleDateFormat;
import software.amazon.awssdk.services.lexruntime.model.PostTextResponse;

@Component
public class LexService {

    public String getText(String text) {

        Region region = Region.US_EAST_1;
        LexRuntimeClient lexRuntimeClient = LexRuntimeClient.builder()
                .region(region)
                .build();

        String engMessage ="";
        try {

            // Need to determine the language.
            String lanCode = DetectLanguage(text);

            // If the lanCode is NOT Eng - then we need to translate the message to English to pass to Amazon Lex.
            if (lanCode.compareTo("en")  !=0)
                engMessage = textTranslateToEn(lanCode, text);
            else
                engMessage=text;

             String userId =  "chatbot-demo" ;
             Map<String,String> sessionAttributes = new HashMap<>();
             PostTextRequest textRequest = PostTextRequest.builder()
                    .botName("BookTrip")
                    .botAlias("scott")
                    .inputText(engMessage)
                    .userId(userId)
                    .sessionAttributes(sessionAttributes)
                    .build();

            PostTextResponse textResponse = lexRuntimeClient.postText(textRequest);
            String message = textResponse.message();

            // If not EN, we need to translate the text back
            String outputText ="";
            if (lanCode.compareTo("en")  !=0)
                outputText = textTranslateFromEn(lanCode, message);
            else
                outputText = message;

            return outputText ;

        } catch (LexRuntimeException e) {
            System.err.println(e.getMessage());
            System.exit(1);
        }
        return "";
    }

    private String DetectLanguage(String text) {

        Region region = Region.US_EAST_1;
        ComprehendClient comClient = ComprehendClient.builder()
                .region(region)
                .build();

        try {

            String lanCode = "";
            DetectDominantLanguageRequest request = DetectDominantLanguageRequest.builder()
                    .text(text)
                    .build();

            DetectDominantLanguageResponse resp = comClient.detectDominantLanguage(request);
            List<DominantLanguage> allLanList = resp.languages();
            Iterator<DominantLanguage> lanIterator = allLanList.iterator();

            while (lanIterator.hasNext()) {
                DominantLanguage lang = lanIterator.next();
                lanCode = lang.languageCode();
            }

            return lanCode;

        } catch (ComprehendException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
        return "";
    }

    public String textTranslateToEn(String lanCode, String text) {

        Region region = Region.US_EAST_1;
        TranslateClient translateClient = TranslateClient.builder()
                .credentialsProvider(EnvironmentVariableCredentialsProvider.create())
                .region(region)
                .build();
        try {
            TranslateTextRequest textRequest = TranslateTextRequest.builder()
                    .sourceLanguageCode(lanCode)
                    .targetLanguageCode("en")
                    .text(text)
                    .build();

            TranslateTextResponse textResponse = translateClient.translateText(textRequest);
            return textResponse.translatedText();

        } catch (TranslateException e) {
            System.err.println(e.getMessage());
            System.exit(1);
        }
        return "";
    }


    public String textTranslateFromEn(String lanCode, String text) {

        Region region = Region.US_EAST_1;
        TranslateClient translateClient = TranslateClient.builder()
                .credentialsProvider(EnvironmentVariableCredentialsProvider.create())
                .region(region)
                .build();
        try {
            TranslateTextRequest textRequest = TranslateTextRequest.builder()
                    .sourceLanguageCode("en")
                    .targetLanguageCode(lanCode)
                    .text(text)
                    .build();

            TranslateTextResponse textResponse = translateClient.translateText(textRequest);
            return textResponse.translatedText();

        } catch (TranslateException e) {
            System.err.println(e.getMessage());
            System.exit(1);
        }
        return "";
    }
}
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