Github user thvasilo commented on a diff in the pull request:
https://github.com/apache/flink/pull/2542#discussion_r80860723
--- Diff: docs/dev/libs/ml/als.md ---
@@ -99,6 +114,26 @@ The alternating least squares implementation can be
controlled by the following
</td>
</tr>
<tr>
+ <td><strong>ImplicitPrefs</strong></td>
+ <td>
+ <p>
+ Implicit property of the observations, meaning that they do
not represent an explicit
+ preference of the user, just the implicit information how many
times the user consumed the
+ (Default value: <strong>false</strong>)
+ </p>
+ </td>
+ </tr>
+ <tr>
+ <td><strong>Alpha</strong></td>
+ <td>
+ <p>
+ Weight of the positive implicit observations. Should be
non-negative.
+ Only relevant when ImplicitPrefs is set to true.
+ (Default value: <strong>1</strong>)
--- End diff --
Can you provide some motivation for this default value? From the paper I
see:
> In our experiments, setting α = 40 was found to produce good results.
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