Open CV error in Python Layer Forward Pass

[Siavash Sakhavi]

Hi, 

I have written a Python Layer which uses cv2.imresize.

I check whether the layer works by itself and I have no error. (Test Mode)

When I want to train the network on ImageNet, the following error comes up:

OpenCV Error: The function/feature is not implemented (Unknown/unsupported array type) in size, file /home/siavash/opencv/modules/core/src/matrix.cpp, line 1561

*** Error in `./build/tools/caffe': free(): invalid pointer: 0x00007e68d28e5440 ***

*** Aborted at 1443199692 (unix time) try "date -d @1443199692" if you are using GNU date ***

PC: @     0x7f690100ecc9 (unknown)

*** SIGABRT (@0x3ea00005f10) received by PID 24336 (TID 0x7f6902ef9780) from PID 24336; stack trace: ***

    @     0x7f690100ed40 (unknown)

    @     0x7f690100ecc9 (unknown)

    @     0x7f69010120d8 (unknown)

    @     0x7f690104b394 (unknown)

    @     0x7f690105766e (unknown)

    @     0x7f68f95d177a cv::StdMatAllocator::deallocate()

    @     0x7f68f95d1e5c cv::Mat::deallocate()

    @     0x7e68d2642fc0 (unknown)

    @     0x7f6901c9124e (unknown)

    @     0x7f6901c9254d (unknown)

    @     0x7f6901cc76d0 (unknown)

    @     0x7f6901c33d43 (unknown)

    @     0x7f6901bbf7bd (unknown)

    @     0x7f6901c33d43 (unknown)

    @     0x7f6901cac577 (unknown)

    @     0x7f6901bef617 (unknown)

    @     0x7e68da6bdcdf caffe::PythonLayer<>::Forward_cpu()

    @     0x7f6902940461 caffe::Net<>::ForwardFromTo()

    @     0x7f69029407e7 caffe::Net<>::ForwardPrefilled()

    @     0x7f690292c969 caffe::Solver<>::Step()

    @     0x7f690292d1b5 caffe::Solver<>::Solve()

    @           0x40bb43 train()

    @           0x409481 main

    @     0x7f6900ff9ec5 (unknown)

    @           0x409c1b (unknown)

    @                0x0 (unknown)

I don't know why I get this error because it doesn't show up in my test for the layer. 

I check what the data type is in the forward pass (using GPU) and it's float 32 np array. 

Any suggestion regarding what the problem may be?

Regards

[Siavash Sakhavi]

To test the layer, I load a dummy prototxt in python and do a forward pass in that environment.

for training, I call the ./build/tools/caffe function.

is it possible that opencv has a problem with this?

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[Georg Waltner]

Hi Siavash,

I stumbled across the same problem. My workaround: scipy.misc.imresize. Works for me.

HTH, Georg.