Hi Radim, Stefano,
1. This is roughly how I think it works, best to confirm checking some
code/paper:
So the support you give via the endpoint serve as a filter over how many
annotated counts an entity should have.
The confidence value you give via the endpoint is used twice:
- To filter spots ( chunks of surfaceforms which will be matched later to
a topic)
- To Filter topic annotations (once you have disambiguated) ( secondRank
Filter is also used in this stage)
Similarity_of_t = ln(surfaceForm Prior ) + ln(prior_of_t) +
contextSimilarity_for_t
softTotalSimilarity = sum(e ^ Similarity_of_i)
final_similarity_of_t = e ^(Similarity_of_t - softTotalSimilarity)
-- order the topics by similarity(greaterFirst
secondRank = e ^(bottomTopicFinalSimilarityScore -
topTopicFinalSimilarityScore)
topics with : secondRank > (1 - confidence ^2) are filtered
2. what is the best value ?
I think this really depends on your use-case, for example if you need lots
of general topics you might want to have a low value, however be prepared
for a wave of dodgy topics and surface forms annotations as well.
If you are doing social-media most likely you have lots of surface forms
and variations of them which are not getting spotted because of the
confidence value.
My advice is to empirically adjust the confidence and support value and
then tweak the spotlight model to adapt it to your particular use case [1]
[1] https://github.com/idio/spotlight-model-editor
On Mon, Jun 16, 2014 at 5:32 PM, Radim Rehurek <[email protected]>
wrote:
> I would be also extremely interested in an answer to this. Thanks for
> asking, Stefano.
>
> What's the best way to calculate "Spotlight's detection confidence" = a
> single number?
>
> Cheers,
> Radim
>
> ---------- Původní zpráva ----------
> Od: Stefano Bocconi <[email protected]>
> Komu: [email protected] <
> [email protected]>
> Datum: 16. 6. 2014 18:14:26
> Předmět: [Dbp-spotlight-users] How is the confidence value calculated?
>
> Hi,
>
> I am new to this list, I came here from the github Spotlight page about
> support and feedback. Questions related to what I am asking have popped up
> a couple of times in this list as far as I can see, but the answers do not
> provide what I am looking for.
>
> I am using the statistical back-end, and I am basically trying to
> reconstruct the confidence value of the entities extracted.
>
> I have extracted entities from tweets and as a first experiment I did
> not asked for any threshold confidence. Now I would like to calculate the
> confidence of each results to see how filtering based on that influences
> the quality of some other process I am doing with the entities.
>
> I am now using the formula:
>
> (1 - .5 * percentageofsecondrank) * similarityscore
>
> Based on the fact that confidence increases with similarity score, but
> decreases if the second candidate is also similar.
>
> Is this comparable to what Spotlight uses in
> http://spotlight.dbpedia.org/rest/annotate? Or else what is the formula?
> Does support play a role?
>
> Thanks,
>
> Stefano
>
>
>
>
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