[nengo-user] Getting/interpreting neural weights

[Laurence Michaels]

Hi All,

This is Larry. I did the coin-flipping task at this summer's brain camp
(which I loved). I'm still working on my project and have confirmed that my
model consistently underestimates Alternations at a Probability of
Alternation around 0.6. (This is the same area where people have a bias and
will underestimate it as well.)

Now, I want to figure out why. My current theory is that the learning
process is not stable/does not converge under this substantial uncertainty.
To research this, I've created a probe to look at the neural weights. I
have a two dimensional input ensemble (200 neurons) connected via PES
learning to a one dimensional prediction (100 neurons). When I use a probe
on the connection to get the weights, it is 3 dimensions:

- dimension 0 is the time during the learning. The range for this index
varies depending upon the 'sample_every' parameter.

- dimension 1 only has a range of 1 (value = 0)

- dimension 2 has a range of 200 (the size of my input ensemble)

I expected the weights to have 3 dimensions (time, 200 for the input
ensemble, 100 for the output ensemble). I seem to be mis-understanding
something. What are the definitions of the dimensions? Any thoughts or
advice?

Best,

Larry
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