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From Gianmarco De Francisci Morales <g...@apache.org>
Subject Re: [jira] [Commented] (SAMOA-54) dump or serialize SAMOA learned model
Date Sun, 31 Jan 2016 14:31:03 GMT
Hi Yu,

Serialisation of the model is definitely a great feature.
The simplest way to do it is to wait for the end-of-stream event and
serialise the model.
To start with, please have a look at this email thread
http://mail-archives.apache.org/mod_mbox/incubator-samoa-dev/201509.mbox/%3cCAGGcCMtQoboeDNu9_T+pnt0noSb-3RZBaKRf5sks65WLWjrTZQ@mail.gmail.com%3e

It's definitely on the roadmap, and if you want to take a stab at it, it
would be great.

Cheers,

-- Gianmarco

On 18 January 2016 at 05:42, Yu Gong (JIRA) <jira@apache.org> wrote:

>
>     [
> https://issues.apache.org/jira/browse/SAMOA-54?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15104081#comment-15104081
> ]
>
> Yu Gong commented on SAMOA-54:
> ------------------------------
>
> For example, I can define an interface of Model which can be serialized,
> and contains the method as predict.
>
> public interface Model extends Serializable {
>     double[] predict(Instance inst);
> }
>
> And for HoeffdingTreeModel, I can define it as:
>
> public class HoeffdingTreeModel implements Model {
>     private Instances dataset;
>     private Node treeRoot;
>
>     public HoeffdingTreeModel(Instances dataset, Node treeRoot) {
>         this.dataset = dataset;
>         this.treeRoot = treeRoot;
>     }
>
>     public HoeffdingTreeModel() {
>     }
>
>     @Override
>     public double[] predict(Instance inst) {
>         double[] prediction;
>         // inst.setDataset(dataset);
>
>         FoundNode foundNode;
>         if (treeRoot != null) {
>             foundNode = treeRoot.filterInstanceToLeaf(inst, null, -1);
>             Node leafNode = foundNode.getNode();
>             if (leafNode == null) {
>                 leafNode = foundNode.getParent();
>             }
>             prediction = leafNode.getClassVotes(inst, null);
>         } else {
>             int numClasses = dataset.numClasses();
>             prediction = new double[numClasses];
>         }
>         return prediction;
>     }
> }
>
> I can create the HoeffdingTreeModel object in
> org.apache.samoa.learners.classifiers.trees.ModelAggregatorProcessor, and
> output the object.
>
> Can you give me some advice about it? Thanks a lot.
>
> > dump or serialize SAMOA learned model
> > -------------------------------------
> >
> >                 Key: SAMOA-54
> >                 URL: https://issues.apache.org/jira/browse/SAMOA-54
> >             Project: SAMOA
> >          Issue Type: New Feature
> >          Components: SAMOA-API
> >            Reporter: Yu Gong
> >
> > If I can dump or serialize SAMOA learned model, I could use SAMOA model
> in an external task. I think it's important.
>
>
>
> --
> This message was sent by Atlassian JIRA
> (v6.3.4#6332)
>

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