Dear @julienosman,
Thank you for responding me,
I am using OTB standalone…
I use Spot image and shape file learning dataset (.shp) with ID and Classe-name.
Using Radom Forest classifier this is what I am geting now !
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: Default RAM limit for OTB is 256 MB
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: GDAL maximum cache size is 402 MB
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: OTB will use at most 4 threads
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: Polygon analysis…
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: Elevation management: setting default height above ellipsoid to 0 meters
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: Reprojecting input vectors…
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: Sampling rates…
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: Sampling strategy : fit the number of samples based on the smallest class
2020-11-26 19:25:00 (INFO) TrainImagesClassifier: Sampling rates for image 1 : className requiredSamples totalSamples rate
2020-11-26 19:25:00 (FATAL) TrainImagesClassifier: No samples found in the inputs!
Usuly it works without probleme but not with spot images !