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https://issues.apache.org/jira/browse/SOLR-12780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646782#comment-16646782
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Christine Poerschke commented on SOLR-12780:
--------------------------------------------
Thanks [~kamulau] for opening this ticket with a patch to add two additional
activation functions!
Just attached slightly revised patch, the main difference is the (proposed) use
of {{Math.tanh}} instead of the
{code}
(Math.exp(in) - Math.exp(-in))/(Math.exp(in) + Math.exp(-in))
{code}
formula - what do you think? Initially I'd wondered about the benefits or
otherwise of reducing the number of {{Math.exp}} calls and then your SOLR-12785
patch made me wonder if [Apache Commons
Math|http://commons.apache.org/proper/commons-math/javadocs/api-3.6.1/index.html]
has activation functions and that then led to the discovery that {{Math.tanh}}
exists in Java itself!
> Add support for Leaky ReLU and TanH activations in LTR contrib module
> ---------------------------------------------------------------------
>
> Key: SOLR-12780
> URL: https://issues.apache.org/jira/browse/SOLR-12780
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: contrib - LTR
> Reporter: Kamuela Lau
> Priority: Minor
> Labels: ltr
> Attachments: SOLR-12780.patch, SOLR-12780.patch
>
>
> Add support for Leaky ReLU and TanH activation functions in
> NeuralNetworkModel.
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