What is the main challenge when dealing with imbalanced data in machine learning?

Which of the following is an example of a word embedding model?

When using k-folds cross-validation for model selection, which of the following statements is true?

Solve for n. If there is more than one solution, separate them with commas.  n = 

Find the domain of the function.  Write your answer in interval notation or as an inequality. Use the Equatio button (blue diamond) or the equation tool,  (you may need to click the 3 vertical dots to find the icon). 

Simplify. Assume all variables represent a positive real number. Use the Equatio button (blue diamond) or the equation tool,  (you may need to click the 3 vertical dots to find the  icon). 

Answer the questions below about the quadratic function.

Solve for y. If there is more than one solution, separate them with commas.

What do word embeddings represent? 

How can unsupervised learning help in anomaly detection in financial texts?