Collect data from models in production

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This article shows how to collect data from an Azure Machine Learning model deployed on an Azure Kubernetes Service (AKS) cluster. The collected data is then stored in Azure Blob storage.

Once collection is enabled, the data you collect helps you:

  • Monitor data drifts on the production data you collect.

  • Analyze collected data using Power BI or Azure Databricks

  • Make better decisions about when to retrain or optimize your model.

  • Retrain your model with the collected data.

What is collected and where it goes

The following data can be collected:

  • Model input data from web services deployed in an AKS cluster. Voice audio, images, and video are not collected.

  • Model predictions using production input data.

Note

Preaggregation and precalculations on this data are not currently part of the collection service.

The output is saved in Blob storage. Because the data is added to Blob storage, you can choose your favorite tool to run the analysis.

The path to the output data in the blob follows this syntax:

/modeldata/<subscriptionid>/<resourcegroup>/<workspace>/<webservice>/<model>/<version>/<designation>/<year>/<month>/<day>/data.csv
# example: /modeldata/1a2b3c4d-5e6f-7g8h-9i10-j11k12l13m14/myresourcegrp/myWorkspace/aks-w-collv9/best_model/10/inputs/2018/12/31/data.csv

Note

In versions of the Azure Machine Learning SDK for Python earlier than version 0.1.0a16, the designation argument is named identifier. If you developed your code with an earlier version, you need to update it accordingly.

Prerequisites

Enable data collection

You can enable data collection regardless of the model you deploy through Azure Machine Learning or other tools.

To enable data collection, you need to:

  1. Open the scoring file.

  2. Add the following code at the top of the file:

    from azureml.monitoring import ModelDataCollector
    
  3. Declare your data collection variables in your init function:

    global inputs_dc, prediction_dc
    inputs_dc = ModelDataCollector("best_model", designation="inputs", feature_names=["feat1", "feat2", "feat3". "feat4", "feat5", "feat6"])
    prediction_dc = ModelDataCollector("best_model", designation="predictions", feature_names=["prediction1", "prediction2"])
    

    CorrelationId is an optional parameter. You don't need to use it if your model doesn't require it. Use of CorrelationId does help you more easily map with other data, such as LoanNumber or CustomerId.

    The Identifier parameter is later used for building the folder structure in your blob. You can use it to differentiate raw data from processed data.

  4. Add the following lines of code to the run(input_df) function:

    data = np.array(data)
    result = model.predict(data)
    inputs_dc.collect(data) #this call is saving our input data into Azure Blob
    prediction_dc.collect(result) #this call is saving our input data into Azure Blob
    
  5. Data collection is not automatically set to true when you deploy a service in AKS. Update your configuration file, as in the following example:

    aks_config = AksWebservice.deploy_configuration(collect_model_data=True)
    

    You can also enable Application Insights for service monitoring by changing this configuration:

    aks_config = AksWebservice.deploy_configuration(collect_model_data=True, enable_app_insights=True)
    
  6. To create a new image and deploy the machine learning model, see How to deploy and where.

Disable data collection

You can stop collecting data at any time. Use Python code to disable data collection.

## replace <service_name> with the name of the web service
<service_name>.update(collect_model_data=False)

Validate and analyze your data

You can choose a tool of your preference to analyze the data collected in your Blob storage.

Quickly access your blob data

  1. Sign in to Azure portal.

  2. Open your workspace.

  3. Select Storage.

    Select the Storage option

  4. Follow the path to the blob's output data with this syntax:

    /modeldata/<subscriptionid>/<resourcegroup>/<workspace>/<webservice>/<model>/<version>/<designation>/<year>/<month>/<day>/data.csv
    # example: /modeldata/1a2b3c4d-5e6f-7g8h-9i10-j11k12l13m14/myresourcegrp/myWorkspace/aks-w-collv9/best_model/10/inputs/2018/12/31/data.csv
    

Analyze model data using Power BI

  1. Download and open Power BI Desktop.

  2. Select Get Data and select Azure Blob Storage.

    Power BI blob setup

  3. Add your storage account name and enter your storage key. You can find this information by selecting Settings > Access keys in your blob.

  4. Select the model data container and select Edit.

    Power BI Navigator

  5. In the query editor, click under the Name column and add your storage account.

  6. Enter your model path into the filter. If you want to look only into files from a specific year or month, just expand the filter path. For example, to look only into March data, use this filter path:

    /modeldata/<subscriptionid>/<resourcegroupname>/<workspacename>/<webservicename>/<modelname>/<modelversion>/<designation>/<year>/3

  7. Filter the data that is relevant to you based on Name values. If you stored predictions and inputs, you need to create a query for each.

  8. Select the downward double arrows next to the Content column heading to combine the files.

    Power BI Content

  9. Select OK. The data preloads.

    Power BI Combine Files

  10. Select Close and Apply.

  11. If you added inputs and predictions, your tables are automatically ordered by RequestId values.

  12. Start building your custom reports on your model data.

Analyze model data using Azure Databricks

  1. Create an Azure Databricks workspace.

  2. Go to your Databricks workspace.

  3. In your Databricks workspace, select Upload Data.

    Selecting Databricks Upload Data option

  4. Select Create New Table and select Other Data Sources > Azure Blob Storage > Create Table in Notebook.

    Databricks table creation

  5. Update the location of your data. Here is an example:

    file_location = "wasbs://mycontainer@storageaccountname.blob.core.windows.net/modeldata/1a2b3c4d-5e6f-7g8h-9i10-j11k12l13m14/myresourcegrp/myWorkspace/aks-w-collv9/best_model/10/inputs/2018/*/*/data.csv" 
    file_type = "csv"
    

    Databricks setup

  6. Follow the steps on the template to view and analyze your data.

Next steps

Detect data drift on the data you have collected.