Databricks-ML-Assoc Databricks Machine Learning — All Questions With Answers

Question 1hardmultiple choice

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Refer to the exhibit. An administrator is configuring a Unity Catalog access policy to restrict experiment deletion. Given the JSON snippet provided, what is the impact of this policy configuration?

Exhibit

JSON: { "policy": "deny", "actions": ["mlflow:DeleteExperiment"], "effect": "allow" }

Question 2hardmulti select

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When logging a model with MLflow, which THREE of the following are essential components of a model signature?

Question 3mediummultiple choice

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An ML engineer wants to compute features with point-in-time correctness to prevent data leakage when training a fraud detection model. Which Databricks Feature Store capability should be utilized?

Question 4mediummulti select

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A team is designing a feature engineering pipeline in Databricks. Which TWO considerations are essential when using Feature Store to ensure data consistency between training and inference?

Question 5hardmulti select

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A machine learning engineer needs to tune a deep learning model using Hyperopt on Databricks. Which THREE steps are required to implement distributed hyperparameter tuning effectively?

Question 6hardmulti select

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A team is building a real-time churn prediction system. Which THREE requirements are critical for the Online Store in this Databricks Feature Store architecture?

Question 7mediummultiple choice

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During a model deployment test, you notice that the model's inference performance is inconsistent. What is the most likely cause, and how can you mitigate it?

Question 8easymultiple choice

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A data scientist wants to share their notebook with a team member, but they want to restrict access so the team member can only view the results without modifying the code. What is the correct sharing permission setting?

Question 9hardmulti select

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An organization is preparing to deploy a machine learning model into production using Databricks Model Serving. Which TWO actions must the user perform to ensure the model is ready for high-availability inference?

Question 10hardmultiple choice

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A machine learning engineer has a scikit-learn model registered in Unity Catalog as `prod_ml.churn.final_model` with version 3 tagged `"champion"`. The batch scoring job reads the model with `mlflow.pyfunc.spark_udf(spark, model_uri="models:/prod_ml.churn.final_model/3")`. When a data scientist registers version 4 and sets the alias `champion` to it, the batch job starts scoring with version 4 without any code change. The engineer must guarantee the batch job always scores with the reviewed version 3 until a new version is explicitly approved. What should the engineer do?

Question 11hardmultiple choice

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A machine learning engineer is using Databricks Feature Store to create a training dataset. They define a feature table with a primary key and a timestamp column. They then use create_training_set to generate a training set. They notice that the training set includes features as of the latest timestamp, not as of the timestamp of each label event. What is the most likely cause of this issue?

Question 12hardmultiple choice

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A data scientist has registered a model in the Databricks Model Registry and wants to deploy it as a real-time endpoint using MLflow Model Serving. They need to ensure that the endpoint automatically scales based on traffic and that the model version is updated without downtime when a new version is registered. Which combination of features should they use?

Question 13easymultiple choice

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A machine learning engineer is using Databricks Feature Store to create a feature table. They want to ensure that the feature table can be used for both model training and online serving. Which of the following is a required step when creating a feature table in Databricks Feature Store?

Question 14hardmultiple choice

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A data scientist is training a model using Databricks AutoML. They notice that the generated notebooks include a step that performs cross-validation using a specific metric. They want to change the primary metric used for model selection to area under the ROC curve (AUC). Where should they specify this in the AutoML experiment configuration?

Question 15hardmultiple choice

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A data scientist is using Hyperopt with SparkTrials on Databricks to tune a model. They notice that some trials fail due to out-of-memory errors on the driver. Which adjustment should they make to improve the tuning process?

Question 16mediummulti select

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A machine learning engineer is using MLflow Tracking on Databricks to log experiments. They want to ensure that the experiments are reproducible and that all necessary information is captured. Which TWO of the following should they log to achieve this? (Choose two.)

Question 17hardmultiple choice

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A machine learning engineer is using Databricks AutoML to train a model on a dataset with a binary target. They want to ensure the model is optimized for recall. Which AutoML configuration should they use?

Question 18hardmultiple choice

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A machine learning engineer is deploying a model to a Databricks model serving endpoint. They need to enable auto-scaling to handle variable traffic. Which configuration parameter should they set when creating the endpoint?

Question 19mediummulti select

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A data scientist is building a Feature Store in Databricks. They need to ensure that features are available for both model training and online serving. They have created a feature table and want to publish it to an online store. Which TWO actions must they perform to make the features available for low-latency online inference? (Choose two.)

Question 20hardmultiple choice

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A machine learning engineer is deploying an MLflow model to a Databricks model serving endpoint. The model was trained and logged with a custom Python function registered in the model's signature. When the endpoint is invoked, the request fails with an error indicating the custom function is not found. The engineer confirms the model artifact and its dependencies are correctly logged in the MLflow run. Which step should the engineer take to resolve this issue?

Question 21mediummultiple choice

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A data scientist is training a model using MLflow on Databricks and needs to ensure that all parameters and metrics are logged for every training run. Which approach ensures the most reliable logging of artifacts and metrics during model training?

Question 22hardmulti select

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A machine learning engineer is troubleshooting a Model Registry issue where models are not being transitioned correctly. Which TWO actions should the engineer take to ensure proper governance and automated testing in the Registry?

Question 23mediummultiple choice

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Refer to the exhibit. A data scientist is attempting to deploy a model using the MLflow client. The error above occurs during the deployment script. What is the most likely cause of this failure?

Exhibit

Error: mlflow.exceptions.RestException: RESOURCE_DOES_NOT_EXIST: Model version with name 'fraud_model' and version '5' not found.

Question 24easymultiple choice

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When preparing data for machine learning in Databricks, which feature of Delta Lake is most beneficial for managing large-scale datasets during the training process?

Question 25mediummultiple choice

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Which Databricks feature should be used to provide a managed, secure, and scalable endpoint for real-time inference of models logged in the Model Registry?

Question 26mediummulti select

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A data scientist needs to perform hyperparameter tuning using Hyperopt. Which THREE components are essential to successfully implement an automated tuning run on a Databricks cluster?

Question 27mediummultiple choice

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A team is building a Feature Store in Databricks. What is the primary advantage of using the Feature Store for training models compared to using raw Delta tables?

Question 28hardmultiple choice

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Which Databricks artifact should be used to encapsulate a model, its environment dependencies, and the required code to ensure consistent model behavior across different deployment environments?

Question 29mediummultiple choice

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When evaluating a machine learning model, what is the main purpose of creating a separate evaluation dataset in Databricks?

Question 30mediummultiple choice

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Which Databricks tool is primarily used for organizing and documenting experiments, tracking parameters, and versioning models during the machine learning lifecycle?

Question 31hardmulti select

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A data scientist is monitoring model drift in Databricks. Which TWO approaches are recommended to detect performance degradation in a production model?

Question 32easymultiple choice

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Which Databricks ML component is best suited for managing access control for machine learning experiments and models across different teams?

Question 33mediummultiple choice

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When a data scientist needs to share an MLflow experiment with a team member, what is the best practice for ensuring collaborative access within Databricks?

Question 34hardmultiple choice

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Which approach is most efficient for handling high-cardinality categorical features in a machine learning model while maintaining compatibility with standard Databricks model serving?

Question 35mediummultiple choice

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A machine learning engineer needs to track hyperparameter tuning runs and log artifacts using MLflow inside a Databricks Notebook. Which approach should be used to ensure runs are automatically nested under a parent run?

Question 36mediummulti select

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A data science team is preparing to deploy a custom machine learning model to Databricks Model Serving. Which TWO steps are required to ensure the model can successfully load and serve predictions using MLflow? Choose 2 answers.

Question 37hardmultiple choice

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Refer to the exhibit. A machine learning engineer deployed an MLflow model to Databricks Model Serving, but inference requests are failing with the error shown in the exhibit. How should the engineer resolve this issue?

Exhibit

2023-10-12 14:22:10,115 ERROR mlflow.pyfunc: Encountered an unexpected error while evaluating model signature. Expected input column 'user_age' of type long, but received type double.

Question 38mediummultiple choice

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A data scientist needs to track parameters, metrics, and model artifacts during training on Databricks. Which component is the primary tool for managing the entire lifecycle of these ML experiments?

Question 39mediummulti select

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Which TWO of the following are primary benefits of using the Databricks Feature Store for machine learning workflows?

Question 40hardmultiple choice

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Refer to the exhibit. A user attempts to transition a model to production, but the code fails with the provided error. What is the most likely cause?

Exhibit

Error: mlflow.exceptions.RestException: RESOURCE_DOES_NOT_EXIST: Model 'production_model' not found in registry.

Question 41easymultiple choice

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Which Databricks feature provides a managed environment specifically optimized for machine learning libraries like TensorFlow, PyTorch, and XGBoost?

Question 42mediummultiple choice

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Which approach is most efficient for deploying a high-throughput, low-latency model in Databricks?

Question 43mediummultiple choice

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What is the primary function of the 'Model Registry' in the Databricks ML ecosystem?

Question 44mediummultiple choice

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A data scientist wants to speed up the process of finding the optimal hyperparameters for a machine learning model. Which Databricks-supported library is optimized for distributed hyperparameter tuning?

Question 45hardmultiple choice

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Refer to the exhibit. A user attempts to load a model using the MLflow Python API, but the load fails. Based on the JSON snippet, what is the most likely issue?

Exhibit

{ "name": "my_model", "version": 1, "status": "PENDING_REGISTRATION" }

Question 46easymultiple choice

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What is the primary benefit of using 'AutoML' in Databricks for a machine learning project?

Question 47mediummultiple choice

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When sharing a Databricks ML experiment with another team, what is the best way to ensure they can reproduce your results exactly?

Question 48hardmulti select

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Which THREE of the following are supported methods for serving machine learning models in Databricks?

Question 49mediummultiple choice

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Which component in Databricks is used to manage the lineage of machine learning data, ensuring that you can trace a model back to the exact version of the data it was trained on?

Question 50hardmultiple choice

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What is the primary technical limitation when deploying an MLflow model that has custom Python dependencies not included in the standard Databricks Runtime?

Question 51mediummultiple choice

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Why is it important to use a 'Feature Store' rather than joining raw tables directly in the training notebook?

Question 52mediummultiple choice

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A machine learning engineer needs to track model parameters, metrics, and artifacts across distributed training runs executed on Databricks. Which component of Databricks Machine Learning should they use to manage and organize this experiment metadata?

Question 53mediummultiple choice

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A data scientist is training a model using MLflow on Databricks. They need to ensure that the model artifacts, environment dependencies, and signature are automatically captured to facilitate seamless deployment to Databricks Model Serving. Which command should they use within the training script?

Question 54hardmultiple choice

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Refer to the exhibit. A model is failing to deploy to Databricks Model Serving. The error log indicates 'Schema Mismatch'. Based on the JSON signature provided, what is the most likely cause of the deployment failure?

Exhibit

{
  "model_signature": {
    "inputs": [{"name": "age", "type": "integer"}, {"name": "income", "type": "double"}],
    "output": {"type": "double"}
  },
  "environment": "conda.yaml"
}

Question 55easymultiple choice

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Which Databricks component should be used to track parameters, code versions, metrics, and output files when running machine learning experiments?

Question 56mediummultiple choice

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A data science team is transitioning from local model development to Databricks. They want to ensure their models are portable across different Databricks workspaces. What is the recommended practice for managing models in this environment?

Question 57mediummultiple choice

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A user is experiencing 'Out of Memory' (OOM) errors during the evaluation phase of a large XGBoost model on Databricks. What is the most effective way to address this while utilizing the distributed nature of Databricks?

Question 58mediummultiple choice

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Which approach is most efficient for tracking hyperparameter tuning metrics across thousands of runs on Databricks?

Question 59mediummulti select

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A data scientist needs to prepare a model for deployment in a highly regulated environment. Which TWO tasks must they complete to ensure the model meets auditability requirements?

Question 60hardmultiple choice

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Refer to the exhibit. The logs indicate a persistent connection failure for a Databricks Model Serving endpoint. What is the most likely cause?

Exhibit

2023-10-27 10:00:00 [ERROR] Model inference failed: Connection refused to serving-endpoint-x
2023-10-27 10:00:05 [INFO] Retrying connection to endpoint...
2023-10-27 10:00:10 [ERROR] Model inference failed: Request timeout

Question 61easymultiple choice

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What is the primary function of the 'Model Signatures' in MLflow?

Question 62mediummultiple choice

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A data scientist is training a machine learning model on Databricks and needs to ensure that every experiment run is automatically tracked, including parameters, metrics, and model artifacts. Which component should the scientist use to achieve this with minimal code changes?

Question 63mediummultiple choice

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A data scientist is using MLflow on Databricks to log a scikit-learn model. They call mlflow.sklearn.log_model(model, 'model') and then inspect the run. They notice the model artifact is stored, but the run does not appear in the Models page of the workspace. They did not call any model registration function. What is the most likely reason the model is not listed in the Models page?

Question 64mediummultiple choice

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A machine learning engineer is orchestrating a multi-step training workflow on Databricks using Databricks Jobs. The workflow includes data preprocessing, model training, and evaluation. The engineer needs to ensure that the evaluation step runs only if the training step completes successfully, and that the preprocessing step runs first. Which feature of Databricks Jobs should be used to define these dependencies?

Question 65mediummultiple choice

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A data scientist is using MLflow to log a custom PyTorch model in a Databricks notebook. They want to register the model in the Databricks Model Registry and later serve it with MLflow model serving. Which function should they call within their MLflow run to log the model with the necessary signature and dependencies?

Question 66hardmultiple choice

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A data scientist is using MLflow to track experiments on Databricks. They notice that the metrics logged during a run are not appearing in the MLflow UI. The run is part of an experiment with many runs. What is the most likely cause for the missing metrics?

Question 67mediummultiple choice

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A data scientist is performing hyperparameter tuning for a scikit-learn model using MLflow on a Databricks cluster. They want to parallelize the tuning to reduce total runtime. Which Databricks-supported method allows them to run multiple trials concurrently with minimal code changes?

Question 68mediummultiple choice

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A machine learning engineer is using Databricks Feature Store to create a feature table for a model that predicts customer churn. The feature table includes customer demographics and transaction history. The engineer wants to ensure that the model can access the latest feature values during online inference. What should the engineer do?

Question 69mediummultiple choice

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A data scientist is using MLflow to track experiments on Databricks. They want to log a custom metric that is computed during model training and later compare it across runs using the MLflow UI. Which MLflow API call should they use?

Question 70hardmulti select

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A machine learning engineer is using Databricks Feature Store to create a training dataset for a model that predicts customer lifetime value. The feature table includes a timestamp key. Which TWO statements are true regarding point-in-time correctness when creating the training set? (Choose two.)

Question 71mediummultiple choice

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A machine learning engineer is using MLflow on Databricks to track an experiment. They want to record the model's hyperparameters and evaluation metrics, but they do not want to save the trained model artifact. Which MLflow API calls should they use?

Question 72hardmulti select

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A data scientist is using MLflow to track experiments on Databricks. They want to compare multiple runs and identify the best performing model based on a custom metric. Which TWO features of MLflow can be used to achieve this? (Choose two.)

Question 73mediummultiple choice

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A data scientist is using MLflow on Databricks to track experiments. After running several training jobs, they notice that the run metrics are recorded but the model artifact is missing when they view the run details. They logged the model using the default MLflow API. What is the most likely cause?

Question 74easymultiple choice

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A machine learning engineer wants to register a model in the Databricks Model Registry using MLflow. They have already trained a model and logged it with MLflow. Which method should they use to register the model programmatically?

Question 75easymultiple choice

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A data scientist has trained a model using scikit-learn and wants to log it to MLflow for deployment. They need to ensure that the model can be served with the correct dependencies. Which MLflow function should they use to log the model?

Question 76hardmultiple choice

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A machine learning engineer is training a model using Databricks AutoML. They notice that the generated notebook includes a step that uses Hyperopt for hyperparameter tuning, but the tuning process is taking too long. They want to reduce the search space without sacrificing model performance significantly. Which Hyperopt configuration change should they make?

Question 77easymultiple choice

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A data scientist has registered a model in the Databricks Model Registry and wants to deploy it as a REST API endpoint for real-time inference. Which Databricks feature should they use?

Question 78easymultiple choice

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A data scientist is training a scikit-learn model on Databricks and wants to automatically log parameters, metrics, and models without writing explicit MLflow logging code. Which approach should they use?

Question 79easymultiple choice

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A data scientist is working in a Databricks notebook and wants to use MLflow to log a trained scikit-learn model. They want to ensure that the model can be loaded later for inference. What is the correct MLflow function to log the model?

Question 80hardmulti select

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A data scientist is using Databricks Feature Store to create a feature table for a recommendation model. They want to ensure that the feature table can be used for both training and batch scoring, and that it supports point-in-time correctness. Which two actions must they take when creating the feature table? (Choose two.)

Question 81mediummultiple choice

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A machine learning engineer is using MLflow Tracking on Databricks to compare multiple runs. They want to programmatically retrieve the best run based on a metric called 'rmse' from an experiment. Which MLflow API call should they use?

Question 82hardmultiple choice

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A machine learning engineer registers a model in the Databricks Model Registry and wants to serve it with low-latency online inference. The model's Python dependencies include a custom private library that is not publicly available. Which deployment approach should the engineer use to ensure the private library is available at inference time?

Question 83mediummultiple choice

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A machine learning engineer is training a scikit-learn model on a Databricks cluster and wants every hyperparameter, evaluation metric, and the fitted estimator itself to be captured automatically without writing custom logging code. The engineer uses MLflow with autologging enabled. Which statement best describes what MLflow autologging records for this scikit-learn run?

Question 84hardmultiple choice

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A machine learning engineer is using Databricks Feature Store to create a training dataset. They want to ensure that the features used during training are exactly the same as those served at inference time. Which Feature Store capability should they rely on?

Question 85mediummultiple choice

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A data scientist has registered a model in the Databricks Model Registry. They want to transition the model from 'Staging' to 'Production' but need to ensure that only specific users can perform this transition. Which Databricks feature should they use to enforce this access control?

Question 86mediummultiple choice

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A data scientist has trained a scikit-learn model and wants to log it to MLflow with a custom signature that includes input and output schema. Which MLflow method should they use to log the model along with the signature?

Question 87mediummultiple choice

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A data scientist is using MLflow to train a scikit-learn model on Databricks. They call mlflow.sklearn.autolog() before fitting the model. After the run completes, they need to retrieve the automatically logged model and load it for batch inference in a separate notebook. Which approach correctly retrieves the logged model for loading?

Question 88hardmultiple choice

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A data scientist is using Databricks AutoML to train a classification model on a dataset with a highly imbalanced target variable. They want to ensure the model evaluation focuses on the minority class. Which evaluation metric should they prioritize when interpreting AutoML results?

Question 89easymultiple choice

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A data scientist is using Databricks Feature Store to create a feature table for a recommendation model. They want to ensure that the same feature computation logic is used both during training and at inference time to avoid training-serving skew. Which Feature Store capability directly addresses this requirement?

Question 90easymultiple choice

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A data engineer is working with a large Delta table and wants to optimize it for machine learning feature engineering. They frequently filter data by a column named 'event_date' and join on a column named 'user_id'. Which Delta Lake feature should they use to improve query performance?

Question 91hardmultiple choice

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A data scientist registered a model in Unity Catalog and now wants to serve it as a low-latency REST endpoint for an application. They need automatic scaling, a secure endpoint URL, and the ability to update the served model version without redeploying infrastructure. Which Databricks capability should they use?

Question 92hardmulti select

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A data science team is using Databricks Repos to manage a machine learning project. They want to ensure that their notebooks and supporting modules are version-controlled and that they can collaborate without overwriting each other's changes. Which TWO practices should they follow? (Choose two.)

Question 93hardmulti select

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A machine learning team is using Databricks Feature Store to serve features for online inference. They need to ensure that the online store remains consistent with the offline store and supports low-latency lookups. Which two practices should they follow? (Choose two.)

Question 94mediummulti select

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A data scientist is using Databricks Feature Store to build training sets and wants to ensure the features used at training time are consistent with those served at inference time. Which TWO practices help guarantee this consistency? (Choose two.)

Question 95mediummultiple choice

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A data scientist has trained a scikit-learn model and logged it with MLflow. They now want to register the model in the Databricks Model Registry and transition it to the 'Production' stage. Which sequence of MLflow API calls should they use?

Question 96easymultiple choice

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A team wants to compare multiple model runs for a fraud detection project, view their metrics side by side, and identify which run produced the best area under the ROC curve. They have already logged each run with MLflow. Which Databricks capability should they use to perform this comparison?

Question 97easymultiple choice

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A data scientist wants to track the performance of a model training run in Databricks. They use MLflow to log parameters and metrics. After the run, they need to view all runs for the experiment in a web-based interface. Which URL should they navigate to?

Question 98hardmultiple choice

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A machine learning engineer is orchestrating a multi-step training workflow with Databricks Jobs. The workflow must retrain a model, evaluate it, and only register it if a quality threshold is met, otherwise stop without registering. Which approach best implements this conditional logic within the job?

Question 99mediummultiple choice

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A machine learning engineer is deploying a model using MLflow Model Serving on Databricks. They want to ensure the endpoint can handle bursts of traffic and automatically scale. Which configuration should they set when creating the served model?

2023-10-27 10:00:00 [ERROR] Model inference failed: Connection refused to serving-endpoint-x 2023-10-27 10:00:05 [INFO] Retrying connection to endpoint... 2023-10-27 10:00:10 [ERROR] Model inference failed: Request timeout