Can someone explain the output of forward() in DNN module?

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@karan07, Your question looks like Mat img = cv::imread("example.jpg"). What is drawn on the image?. Deep learning networks can solve different problems and prediction interpretation depends on task.

For classification - the output is usually a matrix with the probabilities for each class. For regression its usually a single output value of the series of values you want to predict (i.e price of a house). As mentionend by dkurt, the output depends on what your network should do.