Certified Machine Learning Professional Exam - Question 43

Question

A machine learning engineer has developed a model and registered it using the FeatureStoreClient fs. The model has model URI model_uri. The engineer now needs to perform batch inference on customer-level Spark DataFrame spark_df, but it is missing a few of the static features that were used when training the model. The customer_id column is the primary key of spark_df and the training set used when training and logging the model.

Which of the following code blocks can be used to compute predictions for spark_df when the missing feature values can be found in the Feature Store by searching for features by customer_id?

Examice · Accepted Answer

To compute predictions for spark_df, the most appropriate method is fs.score_batch(model_uri, spark_df). This method will automatically retrieve the necessary missing features from the Feature Store by utilizing the customer_id as the primary key, ensuring that all features needed for the model evaluation are included. This approach simplifies the pipeline by handling feature retrieval and batch scoring in a single step, making it an efficient and reliable choice.

victorcolome · Answer

The answer is E. See score_batch in https://api-docs.databricks.com/python/feature-store/latest/feature_store.client.html.
"Additional features required for model evaluation will be automatically retrieved from Feature Store."
Besides, methods "get_missing_features" and "score_model" do not appear in the documentation.

BokNinja · Answer

The correct answer is C. df = fs.get_missing_features(spark_df, model_uri) fs.score_batch(model_uri, df).

In this code snippet, fs.get_missing_features(spark_df, model_uri) is used to retrieve the missing features from the Feature Store using the customer_id as the key. The resulting DataFrame df contains the original data along with the retrieved features. Then, fs.score_batch(model_uri, df) is used to perform batch inference on the DataFrame df using the model specified by model_uri.

IT3008 · Answer

Right answer is E - there is no API info called 'get_missing_features' in the doc.

Certified Machine Learning Professional Exam - Question 43

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