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Databricks Databricks-Machine-Learning-Professional Exam Sample Questions

Question # 1

Which of the following operations in Feature Store Client fs can be used to return a Spark DataFrame of a data set associated with a Feature Store table?

A. fs.create_table

B. fs.write_table

C. fs.get_table

D. There is no way to accomplish this task with fs

E. fs.read_table

Answer

E. fs.read_table

Explanation:

The fs.read_table operation can be used to return a Spark DataFrame of a data set associated with a Feature Store table. This operation takes the name of the Feature Store table and an optional time travel specification as arguments. The fs.create_table operation is used to create a new Feature Store table from a Spark DataFrame. The fs.write_table operation is used to write data to an existing Feature Store table. The fs.get_table operation is used to get the metadata of a Feature Store table, not the data itself. There is a way to accomplish this task with fs, so option D is incorrect. References:

Feature Store Client

Feature Store Tables

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Question # 2

A machine learning engineering team has written predictions computed in a batch job to a Delta table for querying. However, the team has noticed that the querying is running slowly. The team has alreadytuned the size of the data files. Upon investigating, the team has concluded that the rows meeting the query condition are sparsely located throughout each of the data files. Based on the scenario, which of the following optimization techniques could speed up the query by colocating similar records while considering values in multiple columns?

A. Z-Ordering

B. Bin-packing

C. Write as a Parquet file

D. Data skipping

E. Tuning the file size

Answer

A. Z-Ordering

Explanation:

Z-Ordering is an optimization technique that can speed up the query by colocating similar records while considering values in multiple columns. Z-Ordering is a way of organizing data in storage based on the values of one or more columns. Z-Ordering maps multidimensional data to one dimension while preserving locality of the data points. This means that rows with similar values for the specified columns are stored close together in the same set of files. This improves the performance of queries that filter on those columns, as they can skip over irrelevant files or data blocks. Z-Ordering also enhances data skipping and caching, as it reduces the number of distinct values per file for the chosen columns1. The other options are incorrect because:

Option B: Bin-packing is an optimization technique that compacts small files into larger ones, but does not colocate similar records based on multiple columns. Bin-packing can improve the performance of queries by reducing the number of files that need to be read, but it does not affect the data layout within the files2.

Option C: Writing as a Parquet file is not an optimization technique, but a file format choice. Parquet is a columnar storage format that supports efficient compression and encoding schemes. Parquet can improve the performance of queries by reducing the storage footprint and the amount of data transferred, but it does not colocate similar records based on multiple columns3. Option D: Data skipping is an optimization technique that skips over files or data blocks that do not match the query predicates, but does not colocate similar records based on multiple columns. Data skipping can improve the performance of queries by avoiding unnecessary data scans, but it depends on the data layout and the metadata collected for each file4.

Option E: Tuning the file size is an optimization technique that adjusts the size of the data files to a target value, but does not colocate similar records based on multiple columns. Tuning the file size can improve the performance of queries by balancing the trade-off between parallelism and overhead, but it does not affectthe data layout within the files5.

References: Z-Ordering (multi-dimensional clustering), Compaction (bin-packing), Parquet, Data skipping, Tuning file sizes

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Question # 3

A data scientist set up a machine learning pipeline to automatically log a data visualization with each run. They now want to view the visualizations in Databricks. Which of the following locations in Databricks will show these data visualizations?

A. The MLflow Model RegistryModel paqe

B. The Artifacts section of the MLflow Experiment page

C. Logged data visualizations cannot be viewed in Databricks

D. The Artifacts section of the MLflow Run page

E. The Figures section of the MLflow Run page

Answer

D. The Artifacts section of the MLflow Run page

Explanation:

To view the data visualizations that are logged with each run, you can go to the Artifacts section of the MLflow Run page in Databricks. The Artifacts section shows the files and directories that are logged as artifacts for a run. You can browse the artifact hierarchy and preview the files, such as images, text, or HTML1. You can also download the artifacts or copy their URIs for further use2. The other options are incorrect because:

Option A: The MLflow Model Registry Model page shows the information and metadata of a registered model, such as its name, description, versions, stages, and lineage. It does not show the data visualizations that are logged with each run3.

Option B: The Artifacts section of the MLflow Experiment page shows the artifacts that are logged for an experiment, not for a specific run. It does not allow you to preview the files or browse the artifact hierarchy4.

Option C: Logged data visualizations can be viewed in Databricks using the Artifacts section of the MLflow Run page1.

Option E: There is no Figures section of the MLflow Run page in Databricks. The Figures section is only available in the open source MLflow UI, which shows the plots that are logged as figures for a run5. References: View run artifacts, Log, list, and download artifacts, Manage models, View experiment artifacts, Logging Visualizations with MLflow

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Question # 4

A machine learning engineer is migrating a machine learning pipeline to use Databricks Machine Learning. They have programmatically identified the best run from an MLflow Experiment and stored its URI in themodel_urivariable and its Run ID in therun_idvariable. They have also determined that the model was logged with the name"model". Now, the machine learning engineer wants to register that model in the MLflow Model Registry with the name"best_model". Which of the following lines of code can they use to register the model to the MLflow Model Registry?

A. mlflow.register_model(model_uri, "best_model")

B. mlflow.register_model(run_id, "best_model")

C. mlflow.register_model(f"runs:/{run_id}/best_model", "model")

D. mlflow.register_model(model_uri, "model")

E. mlflow.register_model(f"runs:/{run_id}/model")

Answer

A. mlflow.register_model(model_uri, "best_model")

Explanation:

The mlflow.register_model function takes two arguments: model_uri and name. The model_uri is the URI of the model that was logged to MLflow, which can be obtained from the best run object. The name is the name of the registered model in the MLflow Model Registry. Therefore, the correct line of code to register the model is:

mlflow.register_model(model_uri, “best_model”)

This will create a new registered model with the name “best_model” and register the model version from the best run as the first version of that model.

References:

[mlflow.register_model — MLflow 1.22.0 documentation]
[MLflow Model Registry — Databricks Documentation]
[Manage MLflow Models — Databricks Documentation] Message has links.

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Question # 5

After a data scientist noticed that a column was missing from a production feature set stored as a Delta table, the machine learning engineering team has been tasked with determining when the column was dropped from the feature set. Which of the following SQL commands can be used to accomplish this task?

A. VERSION

B. DESCRIBE

C. HISTORY

D. DESCRIBE HISTORY

Answer

D. DESCRIBE HISTORY

Explanation:

The DESCRIBE HISTORY command can be used to view the commit history of a Delta table, including the schema changes, operations, and timestamps. This command can help identify when a column was dropped from the feature set and by which operation. The other commands are either invalid or do not provide the required information. References:

Delta Lake - View Commit History
Databricks Certified Machine Learning Professional Exam Guide - Section 1: Experimentation - Data Management

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