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  1. The Virtual Brain
  2. TVB-1679

Fix Hyperbolic Tangent Coupling

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      Description

      Normalisation by in strength may provoke division by zero.
      The way it is currently handled leads to numerical overflows.

      The previous solution didn't make a lot of sense.

      The normalisation by the in-strength is done, so that if we sum all the weights of a row the result is 1.
      If the in-strength is zero, then it does not make sense to normalise that row. This only means that that node will be disconnected.
      To avoid division by zero a possible solution would be to divide by 1; or normalise only where the in strength is > 0.

      It's very likely that the overflows are a result of very small in strength values in combination with the LB model.

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            • Assignee:
              paula.sanz-leon Paula Sanz Leon
              Reporter:
              paula.sanz-leon Paula Sanz Leon
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