Let's assume you have 100 partitions in Spark, and by mistake, you used Coalesce(200) to increase partitions to 200. What will happen?
Data Interview Questions
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"Explain experience working with Tableau"
- A Bays textbook example (fair and unfair coins) - Some python simple algorithm codes and calculating the complexity of the method - Some ML questions about different methods and how the learning happens and objective functions ....
You have a database of customer transactions and for some users you don’t have much data (1-2 transactions), and you want them to use Revolut’s services more. How would you analyse the data to do so, with such limited data on some users.
Explain Python.
When L2 regularizing a cost function, why does one add to it the square of the variables and not the variable itself.
If they offered me the job right now for $11/hour would I take the job?
Based on a table having columns date, email ID, amount; get me month wise average of amount for each email Id.
How many joins are there? Please explain each
Give some examples of how you have used data in the past to answer questions or solve problems.
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