Keras 2.8 Model.save default shifts from HDF5 to TensorFlow SavedModel, affecting cross‑version loading
Starting with Keras 2.8, the default `Model.save` output switched from the HDF5 file format to the TensorFlow SavedModel directory structure, changing how models are persisted and loaded. When loading an HDF5‑saved model created with an earlier Keras release into a newer environment, it is unclear whether explicit declaration of any custom objects is require
keras