Incorporate a Mendix Application into Amazon Machine Learning

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1 Introduction

We live in a world of digital innovations where many applications help us to make better decisions in our daily lives. Mendix applications are capable of storing data in addition to making accurate predictions using this data based on the best machine learning algorithms that are currently known. With the AwsMLConnector module, it is feasible to incorporate a Mendix application into the Amazon ML service, which opens up new opportunities to make your Mendix application smart.

For more information about regression models and machine learning in general, refer to the Amazon ML tutorial.

This how-to explains how to integrate your Mendix application with AmazonML to make a prediction using a pre-trained regression model and the MakeRealTimeRegressionPrediction action.

This how-to will teach you how to do the following:

  • Configure your Mendix application to be ready to make predictions
  • Make a prediction with the MakeRealTimeRegressionPrediction action

2 Prerequisites

Before using the MakeRealTimeRegressionPrediction action, an appropriate regression model should be trained on the Amazon ML service. The model should be available on an enabled endpoint and configured with these access rules:

  • Amazon access key id and Amazon secret key for authentication
  • Regression model id, as ml-1nlhUMRih2r in this image:

  • Endpoint URL for real-time predictions, as in this image:

With all the necessary preconditions fulfilled, the MakeRealTimeRegressionPrediction action can then be used to make predictions. However, before that can happen, you need to install the AwsMLConnector module and configure a Mendix project.

3 Installation

To make the MakeRealTimeRegressionPrediction action available in a Mendix project, the AwsMLConnector module needs to be imported.

4 Configuration

In order to make use of the MakeRealTimeRegressionPrediction action, you need to configure a Mendix project with these three constants:

  • AwsMLConnector.AwsAccessKey – the Amazon access key for authentication
  • AwsMLConnector.AwsSecretKey – the Amazon secret key for authentication
  • AwsMLConnector.PredictEndpoint – the prediction endpoint URL

5 Using the MakeRealTimeRegressionPrediction Action in a Microflow

5.1 Schema of the Regression Model

With the regression model trained and the Mendix project configured, you are now ready to use the MakeRealTimeRegressionPrediction action for making predictions.

Let’s assume that for this particular example there is a regression model with the following schema of the regression model:

{
  "version" : "1.0",
  "rowId" : "id",
  "rowWeight" : null,
  "targetAttributeName" : "rul",
  "dataFormat" : "CSV",
  "dataFileContainsHeader" : false,
  "attributes" : [ {
    "attributeName" : "id",
    "attributeType" : "CATEGORICAL"
  }, {
    "attributeName" : "cycle",
    "attributeType" : "NUMERIC"
  }, {
    "attributeName" : "s2",
    "attributeType" : "NUMERIC"
  }, {
    "attributeName" : "s3",
    "attributeType" : "NUMERIC"
  }, {
    "attributeName" : "s4",
    "attributeType" : "NUMERIC"
  }, {
    "attributeName" : "rul",
    "attributeType" : "NUMERIC"
  } ],
  "excludedAttributeNames" : [ ]
}

From the schema above, the model predicts a rul feature (see the value of targetAttributeName) based on the given vector of the [id, cycle, s2, s3, s4] features. In the scenario that you need to predict the value of the rul feature from the features’ values of the given [3, 126, 642.88, 1589.75, 1418.89] vector while taking into account that the MakeRealTimeRegressionPrediction action accepts two arguments (the mlModelId and List of AwsMLConnector.RecordEntry objects), the only thing tha needs to be done is to convert the given vector into List of AwsMLConnector.RecordEntry objects.

For more information about the Amazon ML schema format, see the Creating a Data Schema for Amazon ML tutorial.

5.2 Creating a Microflow

First, you need to create a microflow and add an instance of AwsMLConnector.RecordEntry that represents a feature with id set for the Key and 3 set for the Value, which is later inserted into the List of AwsMLConnector.RecordEntry:

You then need to repeat the same steps for the [cycle = 126, s2 = 642.88, s3 = 1589.75, s4 = 1418.89] values in the example in order to fill in the list with all the necessary objects required to make a prediction:

With the model ID and the list of features, you are now ready to make a prediction. Drag the MakeRealTimeRegressionPrediction action from the AwsMLConnector and configure it with an appropriate model ID along with the list of the objects that was just created (be aware that both the model ID and the model’s schema that are used in this tutorial are only relevant to this particular example and will differ in your case):

A prediction made by the MakeRealTimeRegressionPrediction action is available as an instance of the AwsMLConnector.RegressionPrediction type. In the example above, the Prediction variable refers to the predicted value:

As the prediction is available through the Prediction variable, you can simply log the result in the console:

With just a few steps, it is now possible to make your Mendix application smart like never before. Enjoy!

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