Exception in thread "main" java.lang.RuntimeException: OpenCV(3.4.3) C:\projects\javacpp-presets\opencv\cppbuild\windows-x86_64\opencv-3.4.3\modules\ml\src\ann_mlp.cpp:900: error: (-5:Bad argument) input training data should be a floating-point matrix with the number of rows equal to the number of training samples and the number of columns equal to the size of 0-th (input) layer in function 'cv::ml::ANN_MLPImpl::prepare_to_train'

在CHAR_ANN类：
boolean r = getAnn().train(trainData, Ml.ROW_SAMPLE, trainClasses);