[Bug-gnubg] Optimization: Pivoting the input vector and weights matrix.

[Øystein Johansen]

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Just an idea for algorithm improvment(?) I came up with:

Is it possible, when entering the Evaluation function, to pivot the
weight matrix and the input vector and store the order in a local index
array. We sort the input vector (and the weight matrix) such that all
the zeros are at the the end.

When the multiplication then reaches the first zero, it's breaking out
of the loop. Simplifies the main loop by several flops.

Then we sort ar back the right order according to the saved index array.

This was just an idea I had .... is it smart?

How many input zeros are there in an average evaluation? and how many
average zeros are there in average evaluation-from-base?

- -Øystein
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