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I find out some error's on my own , the one main error is in labeling , here

Mat labels(0,1,CV_32FC1);

This should be used as :

Mat labels(num_img,1,CV_32FC1);

After this the error is here :

training_mat.push_back(descriptors_1);

this should be used as

my_img.convertTo( training_mat.row(count_2), CV_32FC1 );

Changing these two works for me , but to be honest i have a little difficultly in understanding why this gives error :

training_mat.push_back(descriptors_1);

I find out some error's on my own , the one main error is in labeling , here

Mat labels(0,1,CV_32FC1);

This should be used as :

Mat labels(num_img,1,CV_32FC1);

After this the error is here :

training_mat.push_back(descriptors_1);

this should be used as

my_img.convertTo( training_mat.row(count_2), CV_32FC1 );

Changing these two works for me , but to be honest i have a little difficultly in understanding why this gives error :

training_mat.push_back(descriptors_1);