[ACT-R-users] Set-similarities.

[Ganapathy Priya]

Thank you Laura for sending the links.

Very interesting and relevant to our work.

I will let you know if I have more questions.

Thank you
Regards
Priya

On Mon, May 12, 2014 at 5:49 AM, Laura Hiatt <laura.hiatt at nrl.navy.mil> wrote:
> We recently modeled similarity between perceptual objects using perceptual similarity (such as the similarity of color RBG values) and activation:
>
> http://mindmodeling.org/cogsci2013/papers/0126/paper0126.pdf
>
> It matches experimental data quite well and was learned over time (at least the BL / spreading activation part was - the perceptual similarity is currently static).  We're still actively working on this - happy to chat about it.
>
>
> Another paper that might be of use is:
>
> http://www.aaai.org/ocs/index.php/WS/AAAIW11/paper/viewFile/3935/4300
>
> which uses ACT-R in conjunction with Leabra to classify visual objects.
>
> Best,
> Laura
>
>
> On May 9, 2014, at 9:04 PM, db30 at andrew.cmu.edu wrote:
>
>>
>>
>> --On Friday, May 09, 2014 05:03:36 PM -0700 Ganapathy Priya <gapri13 at gmail.com> wrote:
>>
>>> Dear ACT-R users,
>>>
>>> We are working on modeling a task of visual object recognition. We
>>> would like to update the similarities of chunks (objects) as the model
>>> learns to recognize objects. We would like to start by making the
>>> set-similarities of chunks as 0 and then update the chunk
>>> (dis)similarities in small increments from 0 to -1 across several
>>> training rounds.
>>>
>>> Our chunks look like this: (add-dm (Caa1 isa object-content image "aa1"))
>>> (add-dm (Cab1 isa object-content image "ab1"))
>>>
>>> (set-similarities  (Caa1 Cab1 0))
>>>
>>> We are looking for sample codes that anybody can share where they have
>>> updated the chunk similarities during run-time. Any other functions to
>>> alter the similarities will also be useful.
>>>
>>
>> Set-similarities/set-similarities-fct is the only recommended command for
>> setting the similarites between chunks, but sdp/sdp-fct can also be used to
>> do so (see the reference manual for details).  Either of those commands
>> can be called at anytime to change similarites.  Alternatively, one can set
>> the :sim-hook parameter to specify a function which is used to compute
>> similarities "on the fly".  The assignment model in unit 5 of the ACT-R
>> tutorial uses that to set similarities between non-chunk values, but it can
>> also be used to dynamically compute chunk similaritles.
>>
>> Hope that helps,
>> Dan
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>