bug(XAI): directory interface with subdirectory/class path in index (list)

[muellerdo]

directory interface with subdirectory/class path in index (list).

XAI decoder wants to store files but subdirectories of index are not available in created /xai directory

[muellerdo]

Option A:

• split after os.separator
• save samples with after separator index

Option B:

• recursively create subdirectories

Does B make any sense?