makes the annotations method implementation mandatory

move some functionality of bob.bio.base.database.BioDatabase to bob.db.base

enabled an automatic merge when the pipeline for 570ea2a9 succeeds

May I ask what this is about? Are we moving biometrics support back to bob.db.base?

Note: Not all non-biometric databases incorporate the notion of "annotation".

mentioned in commit 0614ae82

merged

Speaker, for instance, doesn't have annotations. Was this discussed?

This is just a small change don't worry.

Are we moving biometrics support back to bob.db.base?

No!

The discussion happened here: bob#235 (closed) The problem was that low-level databases could not take advantage of original_directory and original_extension parameters. Now they have a method called original_file_names in bob.db.base which can be used.

Another thing is that bob.bio.base supplied a default implementation for annotations but this was really specific to face databases. I fixed the annotations in all databases and to make sure nothing is missing I made annotations method mandatory. This changes are reflected in bob.bio.spear, bob.bio.face, and bob.bio.video. merge requests are coming.

Other related issues: bob.bio.face#14 (closed) and bob.bio.face!18 (closed)

Now high-level implementations need to implement annotations which for speaker verification databases would be:

    def annotations(self, file):
        return None

I have implemented this in all packages except bob.bio.vein. I'll do that too.