exampleSet.getExampleFromId returns null

navyboys

I want to retrieve an example object by the "exampleSet.getExampleFromId" method, but got an NullPointerException error, anybody can tell me how to use this method?

Sample source likes this (Simplified Version)
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Set<Double> exampleIds = new HashSet<Double>(exampleSet.size());

for (Example example: exampleSet) {
exampleIds.add(example.getId());
}

for (Double exampleId: exampleIds) {
Example example = exampleSet.getExampleFromId(exampleId);
example.getWeight();
}
-------------------------------------------------------------------------------------

fischer

Hi,

hard to tell without an error message. Does your example set actually have an id attribute?

Best,
Simon

fischer

oh, and it looks like you did not call ExmpleSet.remapIds().

Best,
Simon

navyboys

Hi, Simon

Problem resolved by adding ExampleSet.remapIds().
Thank you very much.

Yours ZHENG