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Guide for Databricks Certified Machine Learning Associate

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Quiz

1/10
A machine learning engineer has created a Feature Table new_table using Feature Store Client fs.
When creating the table, they specified a metadata description with key information about the
Feature Table. They now want to retrieve that metadata programmatically.
Which of the following lines of code will return the metadata description?
Select the answer
1 correct answer
A.
There is no way to return the metadata description programmatically.
B.
fs.create_training_set("new_table")
C.
fs.get_table("new_table").description
D.
fs.get_table("new_table").load_df()
E.
fs.get_table("new_table")

Quiz

2/10
A data scientist has a Spark DataFrame spark_df. They want to create a new Spark DataFrame that
contains only the rows from spark_df where the value in column price is greater than 0.
Which of the following code blocks will accomplish this task?
Select the answer
1 correct answer
A.
spark_df[spark_df["price"] > 0]
B.
spark_df.filter(col("price") > 0)
C.
SELECT * FROM spark_df WHERE price > 0
D.
spark_df.loc[spark_df["price"] > 0,:]
E.
spark_df.loc[:,spark_df["price"] > 0]

Quiz

3/10
A health organization is developing a classification model to determine whether or not a patient
currently has a specific type of infection. The organization's leaders want to maximize the number of
positive cases identified by the model.
Which of the following classification metrics should be used to evaluate the model?
Select the answer
1 correct answer
A.
RMSE
B.
Precision
C.
Area under the residual operating curve
D.
Accuracy
E.
Recall

Quiz

4/10
In which of the following situations is it preferable to impute missing feature values with their
median value over the mean value?
Select the answer
1 correct answer
A.
When the features are of the categorical type
B.
When the features are of the boolean type
C.
When the features contain a lot of extreme outliers
D.
When the features contain no outliers
E.
When the features contain no missing no values

Quiz

5/10
A data scientist has replaced missing values in their feature set with each respective feature
variable’s median value. A colleague suggests that the data scientist is throwing away valuable
information by doing this.
Which of the following approaches can they take to include as much information as possible in the
feature set?
Select the answer
1 correct answer
A.
Impute the missing values using each respective feature variable's mean value instead of the
median value
B.
Refrain from imputing the missing values in favor of letting the machine learning algorithm
determine how to handle them
C.
Remove all feature variables that originally contained missing values from the feature set
D.
Create a binary feature variable for each feature that contained missing values indicating whether
each row's value has been imputed
E.
Create a constant feature variable for each feature that contained missing values indicating the
percentage of rows from the feature that was originally missing

Quiz

6/10
A data scientist is wanting to explore summary statistics for Spark DataFrame spark_df. The data
scientist wants to see the count, mean, standard deviation, minimum, maximum, and interquartile
range (IQR) for each numerical feature.
Which of the following lines of code can the data scientist run to accomplish the task?
Select the answer
1 correct answer
A.
spark_df.summary ()
B.
spark_df.stats()
C.
spark_df.describe().head()
D.
spark_df.printSchema()
E.
spark_df.toPandas()

Quiz

7/10
An organization is developing a feature repository and is electing to one-hot encode all categorical
feature variables. A data scientist suggests that the categorical feature variables should not be one-
hot encoded within the feature repository.
Which of the following explanations justifies this suggestion?
Select the answer
1 correct answer
A.
One-hot encoding is not supported by most machine learning libraries.
B.
One-hot encoding is dependent on the target variable's values which differ for each application.
C.
One-hot encoding is computationally intensive and should only be performed on small samples of
training sets for individual machine learning problems.
D.
One-hot encoding is not a common strategy for representing categorical feature variables
numerically.
E.
One-hot encoding is a potentially problematic categorical variable strategy for some machine
learning algorithms.

Quiz

8/10
A data scientist has created two linear regression models. The first model uses price as a label
variable and the second model uses log(price) as a label variable. When evaluating the RMSE of each
model by comparing the label predictions to the actual price values, the data scientist notices that
the RMSE for the second model is much larger than the RMSE of the first model.
Which of the following possible explanations for this difference is invalid?
Select the answer
1 correct answer
A.
The second model is much more accurate than the first model
B.
The data scientist failed to exponentiate the predictions in the second model prior to computing
the RMSE
C.
The data scientist failed to take the log of the predictions in the first model prior to computing the
RMSE
D.
The first model is much more accurate than the second model
E.
The RMSE is an invalid evaluation metric for regression problems

Quiz

9/10
A data scientist uses 3-fold cross-validation when optimizing model hyperparameters for a regression
problem. The following root-mean-squared-error values are calculated on each of the validation
folds:
• 10.0
• 12.0
• 17.0
Which of the following values represents the overall cross-validation root-mean-squared error?
Select the answer
1 correct answer
A.
13.0
B.
17.0
C.
12.0
D.
39.0
E.
10.0

Quiz

10/10
A machine learning engineer is trying to scale a machine learning pipeline pipeline that contains
multiple feature engineering stages and a modeling stage. As part of the cross-validation process,
they are using the following code block:




Certification Exam Databricks Certified Machine Learning Associate Databricks Databricks-Databricks-Machine-Learning-Associate 2-3919236502




A colleague suggests that the code block can be changed to speed up the tuning process by passing
the model object to the estimator parameter and then placing the updated cv object as the final
stage of the pipeline in place of the original model.

Which of the following is a negative consequence of the approach suggested by the colleague?
Select the answer
1 correct answer
A.
The model will take longer to train for each unique combination of hvperparameter values
B.
The feature engineering stages will be computed using validation data
C.
The cross-validation process will no longer be
D.
The cross-validation process will no longer be reproducible
E.
The model will be refit one more per cross-validation fold
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  • Quiz name:Databricks Certified Machine Learning Associate
  • Total number of questions:74
  • Number of questions for the test:50
  • Pass score:80%

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