Question $1\mathrm{.}5.$ Define the function three$\_$classify that takes a row from test as an argument and classifies the row based on using $3-$Nearest Neighbors. Use this function to find the accuracy of a $3-$NN classifier on the test set. accuracy should be a proportion $($not a percentage$)$ of the schools that were correctly predicted. $(10$ points$)$

Hint: You should be using a function you just created!

Note: Usually before using a classifier on a test set, we'd classify first on a "validation" set, which we then can modify our training set again if need be$,$ before actually testing on the test set. You don't need to do that for this question, but you will learn about this more in Data $100.[]$: grader.check$("$q$1\_5")$