Specify facility to change delays in experiment layer.

[sebjameswml]

This is a little like a lesion, but instead of cutting the connection, you change the delay parameter. I have one colleague who would like to do this. What do other think @ajc158 @mondus ?

[ajc158]

Definitely

On 11 Nov 2016 3:41 p.m., "Seb James" notifications@github.com wrote:

This is a little like a lesion, but instead of cutting the connection, you
change the delay parameter. I have one colleague who would like to do this.
What do other think @ajc158 https://github.com/ajc158 @mondus
https://github.com/mondus ?

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[mondus]

Agreed.

[sebjameswml]

Changed title. I'm implementing this in SpineML_2_BRAHMS to explore the right format for the feature.

[sebjameswml]

I coded up delay changes as being something that can be applied either to a generic input connection or to a projection. This would suggest a DelayChange in the expt layer with src_population, dst_population (like a lesion has) and a synapse number (for a projection) xor a src port and dst port (for a generic input). If the DelayChange was set up like this, then the Lesion could be extended this way also.

[sebjameswml]

Here's a proposal for the delay change specification: aa07cf5 (though the synapse should be xs:int not xs:string).

Here, if one required a delay change for a generic input the experiment layer xml would look like:

<Experiment name="some experiment">
    <Model>
        <GenericInputDelayChange src_population="A" src_port="out" dst_population="B" dst_port="in">
            <UL:Delay dimension="ms">
                <UL:FixedValue value="10"/>
            </UL:Delay>
        </GenericInputDelayChange>
    </Model>
    <!-- etc -->

The equivalent code for a delay on a projection would be:

<Experiment name="some experiment">
    <Model>
        <ProjectionDelayChange src_population="A" dst_population="B" synapse="0">
            <UL:Delay dimension="ms">
                <UL:FixedValue value="10"/>
            </UL:Delay>
        </ProjectionDelayChange>
    </Model>
    <!-- etc -->

[sebjameswml]

There's an additional complexity with generic inputs - it's not just a src or dst population that the generic input can connect; it could be a postsynapse or a weight change component.

[sebjameswml]

I've merged in the experiment layer stuff to master. However, I'm not sure I covered the comment above from the 22nd Nov yet.