def predict$\_$from$\_$sim$($self$,$uid,mid$)$:

$"""$

Predict a user rating on a movie given userID and movieID

$"""$

# Predict user rating as follows:

# $1.$ Get entry of user id in rating matrix

# $2.$ Get entry of movie id in sim matrix

# $3.$ Employ $1$ and $2$ to predict user rating of the movie

# your code here

user$\_$idx $=$ self.uid$2$idx$[$uid$]$

movie$\_$idx $=$ self.mid$2$idx$[$mid$]$

sim$\_$ratings $=$ self.Mr$[$user$\_$idx$]*$ self.sim$[$movie$\_$idx$]$

# print$($sim$\_$ratings$[$sim$\_$ratings $>0])$

sim$\_$sum $=$ np$.$sum$($self$.$sim$[$movie$\_$idx$])$

return np$.$sum$($sim$\_$ratings$)/($sim$\_$sum if sim$\_$sum $!=0$ else $0)$

# Sample tests for predict$\_$from$\_$sim in RecSys class

assert$($sample$\_$cb$.$predict$\_$from$\_$sim$(245,276)==$approx$(2\mathrm{.}5128205128205128,$abs$=1$e$-2)),$ "Check predict$\_$from$\_$sim. Look at how you predicted a user rating on a movie given UserID and movieID."

assert$($sample$\_$cb$.$predict$\_$from$\_$sim$(2026,2436)==$approx$(2\mathrm{.}785714285714286,$abs$=1$e$-2)),$ "Check predict$\_$from$\_$sim. Look at how you predicted a user rating on a movie given UserID and movieID."

Error Message:

$---------------------------------------------------------------------------$

AssertionError Traceback $($most recent call last$)$

in

$3$

$4$ # Sample tests for predict$\_$from$\_$sim in RecSys class

$---->5$ assert$($sample$\_$cb$.$predict$\_$from$\_$sim$(245,276)==$approx$(2\mathrm{.}5128205128205128,$abs$=1$e$-2)),$ "Check predict$\_$from$\_$sim. Look at how you predicted a user rating on a movie given UserID and movieID."

$6$ assert$($sample$\_$cb$.$predict$\_$from$\_$sim$(2026,2436)==$approx$(2\mathrm{.}785714285714286,$abs$=1$e$-2)),$ "Check predict$\_$from$\_$sim. Look at how you predicted a user rating on a movie given UserID and movieID."

AssertionError: Check predict$\_$from$\_$sim. Look at how you predicted a user rating on a movie given UserID and movieID.