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i guess, you wanted this:

cv::String file_name = "C:\\Users\\param.xml";
cv::Ptr<cv::ml::ANN_MLP> nnetwork = ml::StatModel::load<ANN_MLP>(file_name);
cerr << nnetwork->isTrained() << endl;

it's important, to have a cv::Ptr there, not a raw one, else it self-destroys it after coming out of load()