Impossible to lunch the test about matconvnet HOT 4 CLOSED

Hi,

I finally have been abled to launch a part of the test. My first error was that I had two versions of Cuda.

I decided to delete one - recomplile everyting. A good part of the test seems to be running but I have an error for this part:

"testing relu
testing vl_nnnoffset
Error using vl_testsim (line 26)
Assertion failed.

Error in vl_testder (line 19)
vl_testsim(dzdx, dzdx_);

Error in vl_test_nnlayers (line 381)
vl_testder(@(x) vl_nnnoffset(x,param), x, dzdy, dzdx, 1e-3*range) ;".

Is it an error from the compilation or maybe my architecture ?

This error is only happening when using vl_nnnoffset. The other tests seem to be all alright.

Thank you again,

Luc

from matconvnet.

Thank you for your fast answer.

The test 8: nnnoffest works well now.

But the test 6 : nnnormalize does not work anymore :
"Error using vl_testsim (line 27)
Assertion failed.

Error in vl_testder (line 23)
vl_testsim(dzdx, dzdx_, tau);

Error in vl_test_nnlayers (line 341)
vl_testder(@(x) vl_nnnormalize(x,param), x, dzdy, dzdx, range * 1e-3, 0.3) ;"

I tried to replace directly the commited files and also to recompile everything.

from matconvnet.

Thank you for pointing this out. normalise.cpp and normalise.cu are optimised for speed, using the faster but less accurate __powf instruction internally for CUDA, and ad-hoc implementation for CPU. This is usually accurate enough, with occasional large numerical differences in the “true” derivative and the one computed numerically, which cause this test to fail depending on the randomly generated input. It does not seem to be a problem in any of the network we have tried to train so far, however, and we get the benefit of an increased speed.

I updated the test to make it repeatable. Could you please check that it now works for you?

On 25 Sep 2014, at 09:12, lucver [email protected] wrote:

Thank you for your fast answer.

The test 8: nnnoffest works well now.

But the test 6 : nnnormalize does not work anymore :
"Error using vl_testsim (line 27)
Assertion failed.

Error in vl_testder (line 23)
vl_testsim(dzdx, dzdx_, tau);

Error in vl_test_nnlayers (line 341)
vl_testder(@(x) vl_nnnormalize(x,param), x, dzdy, dzdx, range * 1e-3, 0.3) ;"

I tried to replace directly the commited files and also to recompile everything.

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from matconvnet.

It works perfectly now !

CPU and GPU mode. (before your update, I ran the GPU mode and it worked).

Thank you very much for your help.

from matconvnet.