Thanks for your question, if you observe in code the K value starts from 1 so you can get that index of minimal error rate at K = 37 not K = 38.
Machine Learning | Data Science Practitioner, Connect with me on LinkedIn:-https://linkedin.com/in/amey23/, Portfolio:-https://amey23.github.io/portfolio/#home
Machine Learning | Data Science Practitioner, Connect with me on LinkedIn:-https://linkedin.com/in/amey23/, Portfolio:-https://amey23.github.io/portfolio/#home
