Re: The time to execute a function is 625 times greate

With performance the devil is always in the detail. Without knowing the
detail, we can't help you find the explanation. It's not intrinsically
surprising that two different ways of writing the same code should exhibit
very different performance.

If I were analyzing this myself, my next step would be to compare the Java
execution profiles. They will be more difficult for you to understand, because
they refer to internal routines within Saxon. But they may highlight whether
there is a difference that leaps out at you.

Michael Kay
Saxonica

> On 1 Aug 2020, at 20:03, Roger L Costello costello@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hi Folks,
>
> I am having great difficulty determining why my XSLT neural network program
runs so slow. I am currently focusing on the f:train function. The Saxon
profile tool reports the gross total time for one call to the f:train function
is 5,460.326 ms.
>
> To see how much time each statement in f:train takes, Michael
MC<ller-Hillebrand suggested that I put each statement into its own function.
Great idea! I did so. I ran the Saxon profile tool on the modified f:train and
you can see below the gross total time required for each statement (each
statement is now in its own function). I summed their times and it came to a
total of 8.742 ms. So, the f:train function should take 8.742 ms but instead
it takes 5,460.326 ms. How can it possibly be that the time to execute the
f:train function is 625 times greater than the sum of the times to execute the
statements in the function? Any suggestions?
>
> /Roger
>
> f:count-inputs-list						0.016
> f:create-inputs							0.039
> f:count-targets-list						0.004
> f:create-targets							0.520
> f:create-hidden-inputs						0.060
> f:create-hidden-outputs						0.058
> f:create-final-inputs						0.054
> f:create-final-outputs						0.008
> f:compute-output-errors					0.025
> f:compute-hidden-layer-errors					2.612
> f:compute-Ek_times_Ok					0.030
> f:compute-One_minus_Ok					0.017
> f:compute-updated-layer-values				0.003
> f:compute-output-transposed					0.003
> f:compute-weight-changes					0.003
> f:compute-learning-rate-multiplied-by-weight-changes		0.100
> f:compute-updated-who					0.034
> f:compute-Ek_times_Ok-v2					0.006
> f:compute-One_minus_Ok-v2					0.008
> f:compute-updated-layer-values-v2				0.006
> f:compute-output-transposed-v2				0.004
> f:compute-weight-changes-v2					0.004
> f:compute-learning-rate-multiplied-by-weight-changes-v2	0.060
> f:compute-updated-wih						0.027
> f:compute-neural-network-with-new-wih			4.959
> f:compute-neural-network-with-new-wih-and-new-who		0.085
> Total Time: 							8.742