PMLE Practice Test 5 — 10 Questions

Question 1

A machine learning engineer wants to define a lightweight pipeline component that runs custom Python code without building a container image. Which KFP SDK feature should they use?

Accepted Answer

Python function component with @dsl.component. The `@dsl.component` decorator in KFP SDK allows you to define a lightweight Python function component that runs custom code without requiring a container image. It automatically generates a container specification from the function's dependencies, making it ideal for simple, non-containerized pipeline steps.

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Importer component

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Container component

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Vertex AI Training job

Question 2

A data scientist needs to scale a prototype deep learning model to train on a massive dataset using multiple GPUs. Which three strategies are essential for efficient distributed training? (Select THREE)

Accepted Answer

Implement data parallelism.. Option B is correct because data parallelism is the foundational strategy for multi-GPU training: the model is replicated on each GPU and each replica processes a different shard of the massive dataset, with gradients aggregated across workers to scale throughput. Option C is correct because at multi-GPU scale the input pipeline can easily starve the accelerators; using tf.data.Dataset with parallel reads (num_parallel_reads / interleave) and prefetching (prefetch(AUTOTUNE)) overlaps data loading and preprocessing with GPU computation so the GPUs are not idle. Option D is correct because synchronous gradient updates (e.g., all-reduce via NCCL, as in tf.distribute.MirroredStrategy) aggregate gradients from all workers before applying the optimizer step, which keeps replicas consistent and yields stable, reproducible convergence for deep learning training. Option A is not correct because a single large batch size is not itself an essential distributed-training strategy; batch size is a tuning choice, and naively enlarging it can hurt convergence and may not fit in memory. Option E is not correct because asynchronous gradient updates are an alternative to, not a requirement for, efficient distributed training, and they can introduce stale gradients that degrade model accuracy and reproducibility.

Answer

Use a single large batch size across all workers.

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Use asynchronous gradient updates to reduce communication overhead.

Question 3

Which THREE actions should be taken to automate a machine learning pipeline using Cloud Build and Vertex AI?

Accepted Answer

Write a cloudbuild.yaml that builds a training container and submits a Vertex AI PipelineJob. Option A is correct because a cloudbuild.yaml file is the declarative configuration Cloud Build uses to define build steps, and one of those steps can build a custom training container image (e.g., via docker build) and then submit a Vertex AI PipelineJob using the gcloud ai pipelines run command or the Vertex AI SDK. Option D is correct because Vertex AI Pipelines is the native service for orchestrating ML workflow steps such as training, evaluation, and deployment as a directed acyclic graph, and Cloud Build can invoke that pipeline as part of CI/CD, giving a fully automated, reproducible ML pipeline. Option E is correct because a Cloud Build trigger bound to the source repository (e.g., a GitHub or Cloud Source Repositories trigger on push or pull request) is what actually initiates the automated build/pipeline run on commits, which is the core of CI/CD automation. Option B is not appropriate because Cloud Functions is not the intended mechanism for retraining models on build completion; Cloud Build triggers or Pub/Sub notifications are the correct integration points, and this adds unnecessary complexity. Option C is not appropriate because polling for build artifacts with Cloud Scheduler is an anti-pattern; event-driven triggers (Cloud Build triggers or Pub/Sub) are preferred over scheduled polling for reacting to new builds.

Answer

Use Cloud Functions to retrain the model each time a build completes

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Set up a Cloud Scheduler job to poll for new build artifacts

Question 4

A data science team uses Vertex AI Workbench and wants to share notebooks with version history. Which service should they use?

Accepted Answer

Cloud Source Repositories. Cloud Source Repositories (CSR) is the correct choice because it provides Git-based version control for notebooks, enabling teams to track changes, collaborate, and maintain a full version history. Vertex AI Workbench integrates natively with CSR, allowing users to clone, commit, and push notebook files directly from the JupyterLab interface, which is essential for collaborative development with revision tracking.

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Artifact Registry

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Cloud Storage

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Data Catalog

Question 5

A data science team has trained a TensorFlow model on-premises using a large dataset. When they try to deploy the model to Vertex AI for online predictions, the deployed model fails to start with a ‘MemoryError’. The model artifact is 2 GB, and the machine type is n1-standard-4 (15 GB RAM). What is the most likely cause?

Accepted Answer

The model is too large for the machine's memory, causing an out-of-memory (OOM) error during loading.. The model artifact is 2 GB, and loading it into memory on an n1-standard-4 machine (15 GB RAM) can still cause a MemoryError. TensorFlow models often require additional memory for graph construction, intermediate tensors, and framework overhead, which can easily exceed the available RAM, especially when the model is loaded entirely into memory before serving.

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The model is stored in a regional bucket and the Vertex AI endpoint is in a different region.

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The machine type does not support TensorFlow models larger than 1 GB.

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The model file is corrupted or missing dependencies, causing a crash.

Question 6

Refer to the exhibit. An alert policy is configured to trigger when prediction latency exceeds 500 ms for 5 consecutive minutes. The team is experiencing many false positive alerts during brief latency spikes. Which adjustment would most effectively reduce false positives while still detecting prolonged latency issues?

Accepted Answer

Increase the duration to 30 minutes. Increasing the duration from 5 to 30 minutes (Option C) directly addresses the problem of false positives from brief latency spikes by requiring the latency to exceed 500 ms for a longer continuous period before triggering an alert. This ensures that only sustained, prolonged latency issues—not transient spikes—activate the policy, aligning with the goal of detecting genuine degradation while ignoring noise.

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Change the comparison to less than

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Add a condition that CPU utilization is also high

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Increase the threshold to 1000 ms

Question 7

A data engineer needs to version large datasets (multiple TB) in a Data Lake on Google Cloud. They require ACID transactions to ensure consistency when multiple jobs read/write concurrently. Which solution should they use?

Accepted Answer

Delta Lake on Dataproc. Delta Lake on Dataproc provides ACID transactions on cloud storage data lakes, enabling concurrent reads/writes with consistency.

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BigQuery table snapshots

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DVC (Data Version Control)

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Vertex AI Feature Store

Question 8

An ML pipeline must run a set of preprocessing tasks for each data shard in parallel. Which KFP SDK features should they use to implement this? (Choose two.)

Accepted Answer

dsl.ParallelFor. dsl.ParallelFor (A) is correct because it is the KFP SDK construct that iterates over a list (such as the set of data shards) and fans out the loop body into parallel task executions, which is exactly what is needed to run preprocessing per shard concurrently. dsl.Collected (C) is correct because it is used with dsl.ParallelFor to gather the outputs of all parallel iterations into a single list, allowing downstream pipeline steps to consume the aggregated results of the per-shard preprocessing. dsl.PipelineParam (B) is not the mechanism for parallel iteration; it only represents a runtime parameter passed into a pipeline or component. dsl.Condition (D) implements conditional branching (if/else) rather than parallel fan-out, and dsl.ExitHandler (E) defines cleanup logic that runs when a scope exits, neither of which provides the required parallel execution over shards.

Answer

dsl.PipelineParam

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dsl.Condition

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dsl.ExitHandler

Question 9

A company has a large dataset of labeled images (e.g., different species of plants). They want to train a custom image classification model with minimal effort and no prior ML experience. Which Google Cloud service should they use?

Accepted Answer

AutoML Vision. AutoML Vision is the correct choice because it allows users with no prior ML experience to train a custom image classification model using a simple graphical interface, requiring only labeled images as input. It automates model architecture search, hyperparameter tuning, and deployment, minimizing manual effort while delivering a production-ready model.

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Cloud TPU

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Vertex AI Workbench with a custom TensorFlow model

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Vision API

Question 10

Match each MLOps practice to its description.

Accepted Answer

CI/CD: Automates the processes of building, testing, and deploying ML models.. This matching question requires associating each MLOps practice (CI/CD, Model Monitoring, Data Versioning) with its correct description. The correct matches are: CI/CD automates building, testing, and deploying ML models (option A); Model Monitoring continuously observes model performance and detects data drift (option C); Data Versioning manages and tracks changes to datasets over time (option E). Common mistakes include confusing CI/CD with monitoring or versioning, or assigning model monitoring to data versioning tasks. The wrong options (B, D, F) are incorrect because they swap responsibilities: B wrongly attributes monitoring to CI/CD, D assigns versioning to monitoring, and F assigns CI/CD to versioning.

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CI/CD: Continuously observes model performance and detects data drift.

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Model Monitoring: Manages and tracks changes to datasets over time.

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Data Versioning: Automates the processes of building, testing, and deploying ML models.