KernelBinaryCategorizer Serialization

[Stephen Mallette]

I was trying to serialize the gov.sandia.cognition.learning.function.categorization.KernelBinaryCategorizer and ran into a problems with it...here's the probably not so useful exception I'm getting:

java.io.NotSerializableException: java.util.HashMap$Values

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)

According to the API, it appears to be marked Serializable:

http://foundry.sandia.gov/releases/latest/javadoc-api/gov/sandia/cognition/learning/function/categorization/KernelBinaryCategorizer.html

Any thoughts on what might be amiss here?  Also, more generally, is it a safe expectation that "categorizer" classes in the foundry are all meant to be serializable so that they can be written to disk and saved for future usage?

Thanks,

Stephen

[Justin Basilico]

Hi Stephen,

It looks like maybe one of the SVM algorithms is storing the support vectors as values from a HashMap, which is breaking the serialization. Which learning algorithm are you using? 

A quick work-around is to take the learned KernelBinaryCategorizer and change the "example" collection by doing something like:

KernelBinaryCategorizer<T, E> learned = ...;

learned.setExamples(CollectionUtil.asArrayList(learned.getExamples());

The ArrayList should be serializable while the HashMap$Values may not be.

Let me know if that works.

Thanks,

Justin

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[Justin Basilico]

It looks like SMO could be exhibiting this behavior, so I changed it to do this automatically after learning.

Thanks, : )

Justin

[Stephen Mallette]

It was SMO.  Your workaround for converting the HashMap$Values fixed the problem. 

Thanks,

Stephen