Shrinkage option for KNN

[Wang Dawei]

Hi: I was trying to implement this on ml-100k

ItemKNNPearson

k=40 shrinkage=2500 reg_u=12 reg_i=1

0.91327

0.7144

Daweis-iMac:bin Dawei$ /Users/Dawei/bin/rating_prediction --training-file=/Users/Dawei/bin/ml-100k/u3.base --test-file=/Users/Dawei/Bin/ml-100k/u3.test --recommender=ItemKNN --recommender-options=k=40 --recommender-options=reg_u=12 --recommender-options=reg_i=1 --recommender-options=shrinkage=2500 --recommender-options=correlation=Pearson

readlink: illegal option -- f

usage: readlink [-n] [file ...]

Recommender MyMediaLite.RatingPrediction.ItemKNN does not have a parameter named 'SHRINKAGE'.

ItemKNN k=40 correlation=BinaryCosine weighted_binary=False alpha=0; baseline predictor: reg_u=12 reg_i=1 num_iter=10

I wonder what is the right option name for shrinkage? Is there any more detailed document for each option? 

Thank you

[Zeno Gantner]

You need to pick the Pearson correlation, not BinaryCosine.

Cheers,

   Z.

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[Wang Dawei]

I did use --recommender-options=correlation=Pearson

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