Enhancement Request: Allow Adding New Elements when Fine-Tuning with --init-model

[Franklalalala]

Background

It is a common approach to fine-tune a pre-trained AI model to related domain. e.g. transfer a QH9 pre-trained DPTB model to Li binded electrolyte molecules.

When utilizing the --init-model setting in DPTB for fine-tuning, the current implementation does not support the introduction of new elements (e.g., Lithium - Li in the mentioned case). This limitation restricts the model's adaptability to novel chemical domains.

Describe the solution you'd like

add flag to allow the change of elements here

Additional Context

No response