activity for web log data alrightif you want to mess with this some more you can solve that feed problem go ahead and strip out things that include feed because we know that' not real web pagejust to get some familiarity with the code orgo look at the log little bit more closelygain some understanding as to where those feed pages are actually coming from maybe there' an even better and more robust way of identifying that traffic as larger class sofeel free to mess around with that but hope you learned your lessondata cleaning hugely important and it' going to take lot of your timesoit' pretty surprising how hard it was to get some reasonable results on simple question like "what are the top viewed pages on my website?you can imagine if that much work had to go into cleaning the data for such simple problemthink about all the nuanced ways that dirty data might actually impact the results of more complex problemsand complex algorithms it' very important to understand your source datalook at itlook at representative sample of itmake sure you understand what' coming into your system always question your results and tie it back to the original source data to see where questionable results are coming from normalizing numerical data this is very quick sectioni just want to remind you about the importance of normalizing your datamaking sure that your various input feature data is on the same scaleand is comparable andsometimes it mattersand sometimes it doesn' butyou just have to be cognizant of when it does just keep that in the back of your head because sometimes it will affect the quality of your results if you don' sosometimes models will be based on several different numerical attributes if you remember multivariant modelswe might have different attributes of car that we're looking atand they might not be directly comparable measurements orfor exampleif we're looking at relationships between ages and incomesages might range from to but incomes in dollars might range from to billionsand depending on the currency it could be an even larger rangesome models are okay with that