2017-04-01 09:12:23 -0600 | received badge | ● Enthusiast |
2017-01-31 10:57:26 -0600 | commented question | OpenCV 3 Java - How to train neural network with TrainData @berak I'll give it a while. Don't want to embarrass myself :) |
2017-01-31 10:25:35 -0600 | commented question | OpenCV 3 Java - How to train neural network with TrainData @berak Unfortunately no. I didn't build it myself. I just downloaded the pre-built .jar file. If that's what you mean. |
2017-01-31 10:12:40 -0600 | commented question | OpenCV 3 Java - How to train neural network with TrainData @berak Yes I was planning on just sticking to the old method for now. However, using TrainData allows you to use calcError and, as you said, to randomly split the train/testdata which are really quite handy. Plus I found myself implementing all those functions anyways. This isn't the first machine learning bug I have encountered in the Java port of OpenCV 3.2. It seems pretty unstable actually. |
2017-01-31 09:34:23 -0600 | asked a question | OpenCV 3 Java - How to train neural network with TrainData I was recently updating my Java OpenCV 2.4 code to OpenCV 3.2. I had some code to train an ANN_MLP. I found out that OpenCV 3.2 has a new class called TrainData and decided to use it. I think I may have a discovered a bug but figured I would ask here first. I have a Mat of samples and a Mat of responses in the ROW_SAMPLE layout, that is each row is a sample. Here is the code I use to train the neural network: This code runs with no errors and on testing the prediction is correct. The following code however does not run but instead crashes java: The "samples" and "responses" Mats are the exact same ones used in the above code snippet. This code snippet throws the following error: Exception in thread "main" java.lang.Exception: unknown exception and then it shows the stack trace to ann.train(td) Is there any way to find out what the "unknown exception" is? Is this a bug only present in the Java port? Maybe I am just doing something wrong but according to the documentation this is correct usage of TrainData. Maybe somebody else has run into this issue. I don't feel there is any need to provide more code due to it working with the same Mats when not using TrainData but if I need to provide more code just let me know. EDIT: I am pretty sure this is a bug now because I tried running the following code and it works just fine. |