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default predicted rating of UserKNN: global mean or user-specific mean? #25

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taolian opened this issue Jan 25, 2016 · 3 comments
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default predicted rating of UserKNN: global mean or user-specific mean? #25

taolian opened this issue Jan 25, 2016 · 3 comments

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@taolian
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taolian commented Jan 25, 2016

In the model UserKNN, whether the default predicted rating is global mean or user-specific mean when nns.size() == 0 or ws == 0?
Line 103 in UserKNN.java
Line 122 in UserKNN.java

There is the same issue with respect to ItemKNN: whether global mean or item-specific mean?
@guoguibing
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I didn't get what you mean. The codes are self-explained.

@taolian
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taolian commented Feb 1, 2016

user-specific mean: a user's own average rating
item-specific mean: an item's own average rating

@guoguibing
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global mean

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@guoguibing @allenjack @taolian