[ACT-R-users] Question related to the Activation of Chunks and Base-Level learning

[Arun Krishna]

Hi Dan,

Thank you very much.
Now I am able to change the base level learning and strengthen the chunk
using the merge-dm command.

Regards,
Arun

On Thu, Aug 5, 2021 at 3:20 PM <db30 at andrew.cmu.edu> wrote:

>
>
>
> --On Thursday, August 5, 2021 5:15 AM -0400 Arun Krishna <
> arunbkris at gmail.com>
> wrote:
>
> >
> >
> > Hi,
> >
> > I have a question related to the Activation of Chunks and Base-Level
> > learning.
> >
> > Problem Description:
> >
> > In the model I am using, the base level learning value is not getting
> changed
> > when I use the chunk merging. I am using add-dm command with python API,
> > where I add the chunks with same slot values and was expecting the base
> level
> > learning for the chunks getting increased.
> >
> > Reference:
> >
> > ACT-R\tutorial\unit4\unit4.pdf,  4.3.2 Chunk Merging section.
> >
> > Code:
> >
> > In the model I am using I had set the sub symbolic computation
> >
> >  (sgp : esc t) and (sgp :rt -0.5).
> >
> > The complete setting for the model is given below
> >
> > "(sgp :v t :esc t :rt -0.5 :lf 0.4 :ans 0.5 :bll 0.5 :act nil :ncnar nil
> > :ul t)
> >
> > (sgp :seed (200 4))"
> >
> >
> >
> > I am using the python API for add-dm
> >
> > actr.add_dm(
> >
> >             [chunkName, "isa", "navigation", "navigationStart",
> currentState,
> > "navigationEnd", "state-16",
> >
> >              "navigationTrigger", trigger])
> >
> > This API is getting triggered with different chunk names. Chunk-1,
> > chunk-2,…..chunk 50. All the chunk has same slot values and my
> expectation
> > is that the base level learning of every chunk will be modified.
> >
> > But when I use (pprint-chunks-plus chunk-3) I get
> >
> >   SIMILARITIES  NIL
> >
> >    REFERENCE-COUNT  0
> >
> >    REFERENCE-LIST  NIL
> >
> >    SOURCE-SPREAD  0
> >
> >    LAST-BASE-LEVEL  0
> >
> >    BASE-LEVEL  NIL
> >
> >    CREATION-TIME  0
> >
> >    FAN-IN  NIL
> >
> >    C-FAN-OUT  0
> >
> >    FAN-OUT  0
> >
> >    IN-DM  NIL
> >
> >    ACTIVATION  0
> >
> >    BUFFER-SET-INVALID  NIL
> >
> > Could you please let me know how to modify the base level learning and
> > reference count of these chunks (Which supposed to point to a single
> chunk
> > with different reference names since the slot values are same) ?
> >
>
>
>
> Add-dm always "adds" a chunk to declarative memory - it does not merge it
> into declarative memory.  There is a merge-dm command that works like
> add-dm except that it merges the chunks into declarative memory.
>
> However, for modifying the base-level the set-base-levels command allows
> one to directly adjust the base-level parameters for a chunk.  It's use
> varies depending upon how the parameters for base-level learning are set
> (:bll and :ol), and you can find the details in the reference manual.
>
> Hope that helps,
> Dan
>
>
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