[Feature Request]: Possibility to save Cropping and Concatenate layer in Tensorflow.Keras

[AdrienDeverin]

Background and Feature Description

Hello,
3 weeks ago a new merge have been done and allow us to save and load models (which is essential for a Deep learning library).
As said in the #976 (comment) thread, this one is incomplete and one of the most important layer (Cropping) is missing.
I did what I can in order to understand the bug in the save function and add myself this new feature, but I failed (it seems to be link to the generate_keras_metadata(saved_nodes, node_paths) function in Tensorflow.keras.Save.cs ). This is why I request you if someone know what to do to add this feature because without it I cannot do anything really interested on the long run.
Thanks you,

API Definition and Usage

Tensorflow.Keras , Cropping1D, Cropping2D, Cropping3D, Concatenate. Saving deep neural network

Alternatives

No response

Risks

No response