load/save neural net from xml file

edit

its still giving error: `OpenCV Error: Unspecified error (The node is neither a map nor an empty collection) in cvGetFileNodeByName, file C:\builds\master_PackSlave-win64-vc11-shared\opencv\modules\core\src\persistence.cpp, line 739

what kind of "node" it is talking about..?

can you put the xml on some gist/pastebin ?

which opencv version is it, exactly ?

i tried to reproduce your problem, saving the model from your python code (other question), and loading it back with the line above in c++, -- no problem here.

i can only guess, but the only node in there, which does a "collection" are the weights

I didnt used gist or pasetbin before....

just put it here: https://bpaste.net/

https://bpaste.net/show/0231733b0205

hmm, mine looks like this:

<?xml version="1.0"?>
<opencv_storage>
<opencv_ml_ann_mlp>     <-- there is an additional "top-level" node, for the whole model

are you using different opencv versions to save/load it ?

version, again ?

opencv 2.4 msvc

really ? 2.4 does not have ANN_MLP or a loadFromString() function

or did you mean, you saved it from 2.4, and try to load it using 3.x ? that would somehow explain the error, your xml is missing the <opencv_ml_ann_mlp> tag

you could work around it like this (using the read() method instead):

FileStorage fs("neuron.xml",0);
Ptr<ml::ANN_MLP> neuron = Algorithm::read<ml::ANN_MLP>(fs.root());