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hi welcome to video 5 in my series on introductory data science with our Im your host Dave Langer the subject of todays video is going to be cross validation and cross validation is arguably maybe the single most important concept to learn and leverage in your data science work when youre trying to apply machine learning algorithms to a data science problem so the ad base cross validation is a way for you to get two things one to maximize the value of your limited training data and two to provide you a way to estimate how accurate or how how good your model is against unseen data and what were going to do is talk about that today and Ill provide you some resources on YouTube so that you can dive in on the on the topic further using the Titanic competition as our vehicle so where we left off last time and youll see here were in the video 5 section of code file is exactly where video 4 ended which was and its clear the console real quick here is we did we did some exploratory mo