Databricks Databricks-Machine-Learning-Professional Exam With Confidence Using Practice Dumps

To drop a column from a Delta table, you need to enable column mapping mode for the table and use the ALTER TABLE statement with the DROP COLUMN clause. Alternatively, you can use the spark.read.format(“delta”).table(path) method to read the Delta table as a DataFrame and then use the drop method to drop the column. This will return a new DataFrame with the column removed. You can then overwrite the originalDelta table with the new DataFrame using the write.format(“delta”).mode(“overwrite”) method. The other options are incorrect because:

• Option A: spark.read.format(“delta”).load(path) will not read the Delta table as a table, but as a directory of files. This will not preserve the schema and metadata of the table, and will not allow you to overwrite the table with the new DataFrame.
• Option C: Delta tables can be modified using the Delta Lake APIs or SQL commands. Delta Lake supports schema evolution and column mapping to enable dropping columns from Delta tables.
• Option D: spark.read.table(path) will not work for Delta tables, as it expects a table name, not a path. To read a Delta table by its path, you need to use the spark.read.format(“delta”).load(path) or spark.read.format(“delta”).table(path) methods.
• Option E: spark.sql(“SELECT * EXCEPT star_rating FROM path”) will not drop the column from the Delta table, but only return a new DataFrame with the column excluded. This will not affect the original Delta table, and will not allow you to overwrite the table with the new DataFrame. References: Drop columns, Delta Lake Quickstart, Delta Lake column mapping

Containers are a type of software packaging that can assist in real-time deployments by packaging software with its own application, tools, and libraries. Containers are isolated and portable environments that run on a shared operating system, but have their ownfile system, dependencies, configuration, and resources. Containers can help developers and operators to build, test, and deploy software faster, easier, and more reliably, as they ensure that the software runs the same way in any environment, whether it is a developer’s laptop, a test server, or a production cluster. Containers can also help to achieve scalability, high availability, and load balancing, as they can be easily created, destroyed, replicated, and orchestrated using tools such as Kubernetes, Docker Swarm, or Amazon ECS. Containers can also integrate with other tools and services, such as MLflow, Databricks, AWS CodeDeploy, and Google Cloud Deployment Manager, to enable end-to-end machine learning pipelines with tracking, reproducibility, and governance1234 References:

• How to Package Your Application’s Infrastructure with Docker
• 21 open source DevOps tools (and what they do)
• Microservices [What is it & Top Benefits]
• 9 Best Software Deployment Tools for 2023 (Paid & Free)

A model signature is a specification of the input and output schema of a model, which defines the names, data types, and shapes of the model inputs and outputs. Logging a model signature with an MLflow model has several benefits, such as:

• The signature can be used to document what type of data is expected as input and output by the model, which can help users and developers understand how to use the model correctly.
• The signature can be used to enforce schema validation when serving models via REST API, which can help prevent errors and ensure data quality. For example, Azure Machine Learning enforces compliance with the model signature for MLflow models that contain a signature1.
• The signature can be used to enable automatic conversion of input data to the appropriate format for the model, such as pandas DataFrame, numpy array, or PyTorch tensor. This can simplify the data preprocessing and inference steps and reduce the code complexity.

References:

• MLflow Models Documentation, Model Signature and Input Example, p. 6-7
• mlflow.models.signature Documentation, p. 1-2
• Guidelines for deploying MLflow models - Azure Machine Learning, p. 1