Thanks Nick, that helps my with my understanding of ALS.
On Wed, 29 Mar 2017 at 14:41, Nick Pentreath
wrote:
> No, it does a random initialization. It does use a slightly different
> approach from pure normal random - it chooses non-negative draws which
> results in very slightly better results
No, it does a random initialization. It does use a slightly different
approach from pure normal random - it chooses non-negative draws which
results in very slightly better results empirically.
In practice I'm not sure if the average rating approach will make a big
difference (it's been a long whi
In the paper “Large-Scale Parallel Collaborative Filtering for the
Netflix Prize”, the following steps are described for ALS:
Step 1 Initialize matrix M by assigning the average rating for that
movie as the first row, and
small random numbers for the remaining entries.
Step 2 Fix M, Solve U by min
