create chatbot with questions and answers

[vvasil3v]

Hello,
I am trying to create a chatbot with csv data like:

Question,Answer
"What is the capital of {{country}}?","Paris"
"How many planets are there in our solar system?","Eight"
"What is the square root of {{number}}?","{{sqrt(number)}}"

here is the code:

`$dataset = Rubix\ML\Datasets\Labeled::fromIterator(new Rubix\ML\Extractors\CSV(dirname(FILE).'/training.csv',true));

    [$training, $testing] = $dataset->stratifiedSplit(1); 
    $estimator = new \Rubix\ML\Classifiers\KNearestNeighbors(5, true);
    $estimator->train($training);

    $user_question = 'What is the capital of France?';

    $parameters = extract_parameters($user_question);
    $predicted_answer = $estimator->predict([$user_question]);
    $final_answer = replace_placeholders($predicted_answer[0], $parameters);

    echo "Answer: $final_answer\n";`

I have this error:

Uncaught Rubix\ML\Exceptions\InvalidArgumentException: K Nearest Neighbors (k: 5, weighted: false, kernel: Euclidean) is incompatible with categorical data types. in /content/controller/vendor/rubix/ml/src/Specifications/SamplesAreCompatibleWithEstimator.php:68 Stack trace: #0 /content/controller/vendor/rubix/ml/src/Specifications/SpecificationChain.php(43): Rubix\ML\Specifications\SamplesAreCompatibleWithEstimator->check() #1 /content/controller/vendor/rubix/ml/src/Classifiers/KNearestNeighbors.php(186): Rubix\ML\Specifications\SpecificationChain->check() #2 /content/controller/vendor/rubix/ml/src/Classifiers/KNearestNeighbors.php(171): Rubix\ML\Classifiers\KNearestNeighbors->partial(Object(Rubix\ML\Datasets\Labeled)) #3 Rubix\ML\Classifiers\KNearestNeighbors->train(Object(Rubix\ML\Datasets\Labeled)) #4

am i missing something or it will not work like that ?

thank you