Please post your message to forum.orfeo-toolbox.org This mailing list must be closed.
Mickaël Le jeu. 28 mai 2020 à 10:40, Bassam <[email protected]> a écrit : > Hello every one, > I have a problem with regression applications. I'd like to know if there > are any workflow, precautions, etc. I was applying the > TrainRegression/TrainImagesRegression. I used packages from 6.2, 7.0 and 7.1 > > *for TrainiImagesRegression*: > The used predictor images are of type float, 30 bands images > the label image is a float image (how to provide stats file for both of > them? if I use io.imstat , an error of mismatching size is reproduced!) > > *The output model: * contains only 2 classes (I expected too many > classes, since it is a regression problem). When generating the output > image (using ImageRegression), it produces a similar to the mask file (an > roi file with 1s where the regressor should predict the values) > > *for TrainRegression*, the training is using the predictor and label > image, as stated in the documentation as 31 bands (30 for input and last > band for the lable image). The model wasn't completed, becauuse of error > related to mse= - nan, as the following: > > *Error using 7.1*: > Mean Square Error = -nan > Output parameters value: > io.mse: 3.402823466e+38 > > *The model file can not be inferred, with the following:* > svm_type epsilon_svr > kernel_type rbf > gamma 1 > nr_class 2 > total_sv 0 > rho -nan > SV > > > I'd like to know/request also, the following: > Can I set a gamma parameter to the libsvm parameter set or not? instead of > search for it using .opt parameter (I did a work around by asigning a > search grid for gamma with adjacent values, as given in my commend, > hereinafter) > Can I scale the data between 0 and 1, rather than normalize the data? (my > data contains hot encoded classes) > What is structure of the training and validation vector file (should it > contain different polygons for different values? as an analogy with a > classification problem) > Could we have documentation for model file structure? > > my command looks like: (I couldn't use the io.imstat file becuase it give > error, it appears that the application uses the same xml file to scale the > predictor and label image) > > otbcli_TrainImagesRegression -io.il pfile1.tif pfile2.tif -io.ip > lfile1.tif lfile2.tif -io.vd vec1.shp vec2.shp -io.out Model_svm.txt > -sample.nt 10000 -sample.type periodic -ram 8000 -classifier libsvm > -classifier.libsvm.k rbf -classifier.libsvm.opt 1 -classifier.libsvm.c 1000 > -classifier.libsvm.gamma_grid.min_val 0.001 > -classifier.libsvm.gamma_grid.max_val 0.002 > > I am grateful for the attention that you may put for this issue. > > Thanks > > > > > > > -- > This mailing will be abandoned soon in favor of a more friendly forum: > https://forum.orfeo-toolbox.org > Thanks to visit it for any question related to Orfeo Toolbox (OTB) usage, > or to check the OTB FAQ: > http://www.orfeo-toolbox.org/FAQ.html > --- > You received this message because you are subscribed to the Google Groups > "otb-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/otb-users/8e9ae782-facb-4b0b-b7e9-48e9e7426c23%40googlegroups.com > <https://groups.google.com/d/msgid/otb-users/8e9ae782-facb-4b0b-b7e9-48e9e7426c23%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- This mailing will be abandoned soon in favor of a more friendly forum: https://forum.orfeo-toolbox.org Thanks to visit it for any question related to Orfeo Toolbox (OTB) usage, or to check the OTB FAQ: http://www.orfeo-toolbox.org/FAQ.html --- You received this message because you are subscribed to the Google Groups "otb-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/otb-users/CAHwkZJo-N8no7K9VA2EgCep1G5%3DSVvJKhTOPCpbuuX%3DWNchrBw%40mail.gmail.com.
