Keras objects cannot be saved like other R objects.
The auxiliary functions
to_callable() address this issue.
to_savable() is (indirectly) based on
load_model_weights_hdf5(); one cannot work
unserialize_model() in this case because of the
See the source code for more details.
The GNN object with keras components replaced by savable ones.
The GNN object with certain components replaced by keras objects.
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