Walmart Data Scientist interview questions

HR reached out to me on Linkedin, Interview process was of 4 1 hour rounds. 1st round- Probability and Mathematical concepts behind linear regression, logistic regression, xgboost 2nd round- Going through CV, discussed project which I have done and questions around it 3rd round- was asked about transformers and to implement Logistic regression complete code from scratch 4th round- HM round, he discussed the type of problem they are tackling, about team. Overall experience was okay except 3rd round which went terrible. After completeion of all round HR took all the details and then said this position has gone to hold for now and never reverted back.