Loading saved model from keras importer

I tried to importing my model from a different computer using Matlab R022b. And then I got this error:

Error using nnet.internal.cnn.tensorflow.tf2mex

Invalid MEX-file

'C:\ProgramData\MATLAB\SupportPackages\R2022b\toolbox\nnet\supportpackages\keras_importer\+nnet\+internal\+cnn\+tensorflow\tf2mex.mexw64':

The file cannot be accessed by the system.

I used the same Matlab version with the same Deep learning toolbox

Answer 1

[Nihal Reddy]

I understand you are getting an error while trying to import model using Keras importer in MATLAB R2022b.

The error message is mostly likely due the model missing a file called 'keras_metadata.pb', it is caused by inappropiate way when saving the model in TensorFlow.

This is because the model is not a Saved Model (https://www.tensorflow.org/guide/saved_model). Please regenerate model and save model using

model.save

instead of

tf.saved_model.save

Thus, the 'keras_metadata.pb' will be included, and MATLAB should import the model successfully.

Currently, "importKerasNetwork"supports TensorFlow-Keras versions as follows:

• The function fully supports TensorFlow-Keras versions up to 2.2.4.
• The function offers limited support for TensorFlow-Keras versions 2.2.5 to 2.4.0.

Refer to the following documentation link for more information and examples-

https://www.mathworks.com/help/releases/R2022b/deeplearning/ref/importkerasnetwork.html

Answer 2

[Sid]

Hi, just need to revive this thread, since I am facing this exact problem while trying out the example:

Brain MRI Segmentation Using Pretrained 3-D U-Net Network

Early in the example, it instructs me to use :

net = importNetworkFromTensorFlow(fullfile(dataDir,"trainedSynthSegModel")).

Initially, I installed the module since it was not available, but after imstallation,

subsequent runs gave me the following error message, pasted below. running dependency walker on the tf2mex.mexw64 shows many missing dlls, almost all of them are libmex* or similar:

-------------------------

LIBMATLABDATAARRAY.DLL

LIBMEX.DLL

LIBMWFL.DLL

LIBMWFOUNDATION_FILESYSTEM.DLL

LIBMWI18N.DLL

LIBMWSPROOTUTILS.DLL

LIBMX.DLL

LIBUT.DLL

---------------------------------------

How should I proceed from this point onwards? I tried changing/adding the PATH variables in system settings, but I am still getting this error. executing !path from matlab command window whows me the path where ther libs are.

Hope to get some constructive help on this!Thanks!

Sid.

Error using nnet.internal.cnn.tensorflow.tf2mex

Invalid MEX-file 'C:\ProgramData\MATLAB\SupportPackages\R2025a\toolbox\nnet\supportpackages\keras_importer\+nnet\+internal\+cnn\+tensorflow\tf2mex.mexw64': The specified module could not be found.

Error in

nnet.internal.cnn.tensorflow.savedmodel.TFSavedModel (line 22)

smstruct = jsondecode(nnet.internal.cnn.tensorflow.tf2mex('saved_model', fullfile(obj.SavedModelPath, 'saved_model.pb')));

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in

nnet.internal.cnn.tensorflow.ImportManager/translate (line 64)

sm = savedmodel.TFSavedModel(this.ModelPath, this, true);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in

nnet.internal.cnn.tensorflow.importTensorFlowNetwork (line 31)

net = importManager.translate;

^^^^^^^^^^^^^^^^^^^^^^^

Error in

nnet.internal.cnn.tensorflow.importNetworkFromTensorFlow (line 12)

Network = nnet.internal.cnn.tensorflow.importTensorFlowNetwork(modelFolder, 'TargetNetwork', 'dlnetwork', 'PackageName', options.PackageName, 'Namespace',options.Namespace, 'OnlySupportDlnetwork', true, 'PreferredNestingType', options.PreferredNestingType);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in

importNetworkFromTensorFlow (line 11)

Network = nnet.internal.cnn.tensorflow.importNetworkFromTensorFlow(modelFolder, varargin{:});

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^