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Re: [help-GIFT] Searching all collections

From: Müller , Wolfgang
Subject: Re: [help-GIFT] Searching all collections
Date: Sun, 18 Sep 2011 23:18:15 +0200

Hi all,
I think there is.

Look into gift-config.mrml. In gift-config.mrml, query processors are built of other query processors. The separate_normalisation algorithm makes use of it. It uses 4 query engines that are configured to use the same collection but use different features on these collections. (As I recall, the queries are processed in parallel, making use of multiprocessor architectures. Debugging that stuff was good fun.) You could configure the query processors to use 4 different collections and this should do about what you want them to do.

There would be an issue, though: The ranking method of GIFT considers the other images of one collection for scoring. As a consequence, if you run 4 queries in 4 collections, the ranking values would not be quite commensurate. However, if this did not hurt you before, knowing that won't hurt you either.


On Sun, Sep 18, 2011 at 2:41 PM, Henning Müller <address@hidden> wrote:
Hi Pedro,

I think that querying separately is the easiest way. Another possibility is to re-index all images into a single collection, which might be a bit fast.

I do not think that there is a function in GIFT to query several collections.

Kind regards, Henning

On 9/16/11 4:15 PM, Pedro Pinhao wrote:

I'm trying to query all collections for a similar image in the server.
Is there any way to do this?

I've tried iterating trough all collections one by one but that is not
very good performance wise.

Thank You,

Pedro Pinhão

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Henning Müller, PhD, Prof.
HES-SO Valais
TechnoArk 3, 3960 Sierre, Switzerland
Tel. +41 27 606 9036

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