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Databricks Machine Learning Associate Exam - Topic 3 Question 26 Discussion

Actual exam question for Databricks's Databricks Machine Learning Associate exam
Question #: 26
Topic #: 3
[All Databricks Machine Learning Associate Questions]

A data scientist wants to use Spark ML to one-hot encode the categorical features in their PySpark DataFrame features_df. A list of the names of the string columns is assigned to the input_columns variable.

They have developed this code block to accomplish this task:

The code block is returning an error.

Which of the following adjustments does the data scientist need to make to accomplish this task?

Show Suggested Answer Hide Answer
Suggested Answer: C

For large datasets, Spark ML uses iterative optimization methods to distribute the training of a linear regression model. Specifically, Spark MLlib employs techniques like Stochastic Gradient Descent (SGD) and Limited-memory Broyden--Fletcher--Goldfarb--Shanno (L-BFGS) optimization to iteratively update the model parameters. These methods are well-suited for distributed computing environments because they can handle large-scale data efficiently by processing mini-batches of data and updating the model incrementally.


Databricks documentation on linear regression: Linear Regression in Spark ML

by Brock at Mar 04, 2025, 05:06 AM

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Ivette
4 months ago
I thought VectorAssembler was needed for this too!
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Francine
4 months ago
Removing the fit line? That doesn't seem right.
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Arminda
5 months ago
Wait, can you skip the fit operation? Sounds off.
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Luz
5 months ago
Totally agree with that! StringIndexer is essential.
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Hailey
5 months ago
They need to use StringIndexer prior to one-hot encoding.
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Rebbecca
5 months ago
I feel like VectorAssembler is more for combining features rather than one-hot encoding, so that option seems off to me.
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Bonita
5 months ago
I practiced a similar question, and I believe using StringIndexer is crucial for categorical features.
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Trina
6 months ago
I think the OneHotEncoder might need a method parameter, but I can't recall the exact syntax.
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Tonja
6 months ago
I remember something about needing to use StringIndexer before one-hot encoding, but I'm not entirely sure if that's the only step needed.
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Simona
6 months ago
I'm feeling pretty confident about this one. I think the solution is to specify the method parameter in the OneHotEncoder to handle the string columns properly.
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Cassi
6 months ago
Based on the options, it seems like we might need to use StringIndexer first to convert the string columns to numeric indices before one-hot encoding. That could be the issue.
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Melissia
6 months ago
I'm a bit confused by the OneHotEncoder setup. I wonder if we need to do some additional preprocessing on the data before applying it.
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Annmarie
6 months ago
Okay, let me think this through step-by-step. I think the key is to understand what the error is telling us and how we can fix it.
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Derick
6 months ago
Hmm, this looks like a tricky one. I'll need to carefully review the code and error message to figure out what's going on.
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Jill
6 months ago
Interesting, I wonder if we need to use VectorAssembler to combine the features into a single vector before one-hot encoding. That might be the key step we're missing.
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Mammie
6 months ago
Ah, I see. We might need to use StringIndexer first to convert the string columns to numeric indices before one-hot encoding them. That could be the issue.
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Eladia
6 months ago
Hmm, the fit operation seems unnecessary here since we're just trying to transform the data, not train a model. I'd try removing that line and see if that fixes the problem.
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Mel
6 months ago
I'm not entirely sure what the issue is here, but I think I might need to specify the method parameter to the OneHotEncoder to get this working.
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Thurman
11 months ago
Maybe the error is because they forgot to add the 'sparkly' parameter to the OneHotEncoder. You know, to make it extra fabulous.
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Shannan
11 months ago
I heard the data scientist tried to one-hot encode their socks. Turns out they were just a bunch of ones and zeros!
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Kenny
9 months ago
C: They need to use StringIndexer prior to one-hot encoding the features.
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Martha
9 months ago
B: They need to use VectorAssembler prior to one-hot encoding the features.
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Daniela
10 months ago
C: They need to use VectorAssembler prior to one-hot encoding the features.
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Delisa
10 months ago
B: They need to use StringIndexer prior to one-hot encoding the features.
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Hannah
10 months ago
A: They need to specify the method parameter to the OneHotEncoder.
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Wilburn
10 months ago
A: They need to specify the method parameter to the OneHotEncoder.
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Alfred
11 months ago
VectorAssembler? Sounds like a superhero name. Maybe that's the solution, but I'm not sure.
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Pura
10 months ago
User3: Maybe they need to use StringIndexer before one-hot encoding the features.
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Lonny
10 months ago
User2: No, they should specify the method parameter to the OneHotEncoder.
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Dick
10 months ago
User1: I think the data scientist needs to use VectorAssembler before one-hot encoding.
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Rosendo
11 months ago
Ah, I see the issue. The method parameter is missing from the OneHotEncoder. We need to specify that.
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Essie
10 months ago
User1: Let's add that parameter and see if it works.
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Joaquin
11 months ago
User2: Yes, that's correct. That should fix the error.
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Eden
11 months ago
User1: I think we need to specify the method parameter to the OneHotEncoder.
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Jenelle
12 months ago
Wait, I think we need to use StringIndexer first to convert the string columns to numerical values. Then we can use OneHotEncoder.
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Latrice
10 months ago
D: And OneHotEncoder will then encode those numerical values as binary vectors.
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Osvaldo
10 months ago
C: That makes sense, StringIndexer will convert the strings to numerical values.
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Whitley
10 months ago
B: Then we can use OneHotEncoder to encode the categorical features.
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Reita
11 months ago
A: I think you're right, we should use StringIndexer first.
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Ligia
12 months ago
I believe they should also use StringIndexer before one-hot encoding the features to properly encode the categorical values.
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Quentin
12 months ago
Hmm, the error is probably due to the fit operation. Let's try removing that line and see if it works.
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Lawrence
11 months ago
User2: Yeah, let's try that and see if it fixes the error.
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Adaline
11 months ago
User1: I think we should remove the line with the fit operation.
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Essie
12 months ago
I agree with Daisy. Without specifying the method parameter, the code won't work properly.
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Daisy
1 year ago
I think the data scientist needs to specify the method parameter to the OneHotEncoder.
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