Keras Neural Networks and Fabrik

A screenshot of Fabrik

I tried to import several keras neural networks  to Fabrik, and this is the result:
These are the models I successfully imported:

Model Link	Fabrik Link
https://github.com/anantzoid/VQA-Keras-Visual-Question-Answering	http://fabrik.cloudcv.org/caffe/load?id=20180105045732jmyeu
https://github.com/LemonATsu/Keras-Image-Caption
http://kodu.ut.ee/~leopoldp/2016_DeepYeast/code/caffe_model/	http://fabrik.cloudcv.org/caffe/load?id=20180102135425bzkzy

And these are some models I had troubles with:

Model Link	Successfully Generated the JSON Model?	Problem	Error Message
https://github.com/ykamikawa/SegNet	Yes	Error when importing	ValueError: Unknown layer: MaxPoolingWithArgmax2D
https://github.com/zhixuhao/unet	Yes	Error when exporting	ValueError: `Concatenate` layer requires inputs with matching shapes except for the concat axis. Got inputs shapes: [(None, 64, 64, 512), (None, 63, 63, 512)]
https://github.com/yihui-he/u-net	Yes	Error when exporting	ValueError: `Concatenate` layer requires inputs with matching shapes except for the concat axis. Got inputs shapes: [(None, -1, 19, 256), (None, 0, 20, 256)]
https://github.com/aitorzip/Keras-ICNet	Yes	Error when importing	ValueError: bad marshal data (unknown type code)
https://github.com/preddy5/segnet	Yes	Error when importing	Cannot import layer of Layer type
https://github.com/k3nt0w/FCN_via_keras/	No		ValueError: The input must have 3 channels; got `input_shape=(3, 224, 224)`
https://github.com/0bserver07/Keras-SegNet-Basic	No		ValueError: total size of new array must be unchanged