TypeError: h5py objects cannot be pickled

This error occurs when trying to pickle an h5py object, such as a Dataset or Group, which is not allowed. Pickling is the process of converting an object into a serialized format that can be saved or transmitted, but h5py objects cannot be pickled because they contain references to C data structures that cannot be serialized.

To solve this error, you can either avoid pickling h5py objects or use a different serialization method that is compatible with h5py objects. One alternative is to use the JSON format, which can be used to serialize h5py datasets as nested lists or dictionaries. Another option is to use a different storage format, such as a database or a different file format.