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What does k-means clustering entail, and does it always result in a global optimum? Write a program for k-means clustering given an N*D matrix.

In a programming language you are proficient in, how would you code a binary tree inversion?

What did you learn from a craft conference you attended recently?

In what ways are your experiences aligned with IBM's values.

Explain the importance of feature selection in machine learning.

What are the best practices for processing categorical data that has high cardinality?

Please tell us about a probability distribution that doesn't abide by the standard normal distribution? Do you have an idea about any industry where this probability distribution could be applied?

Using a join between the "orders" and "customers" tables, develop an SQL query to calculate the average order value for customers based in the United States who have made at least 3 orders within the past month.

Could you elaborate on the assumption of error in linear regression and why it matters for precise modeling?

Please explain the differences between left join, right join, and union operations in database querying.,