[FR] Support setting tags in custom importer class

[CourchesneA]

Instructions

Proposal Summary

When creating a dataset importer, it would be great to have a way to specify what split the item belongs to. It seems fy.Sample have a tags field that can be used for that, but in the importer, the __next__ function returns (image_path, image_metadata, label), and I didn't find a way to set a Sample property from there.

Motivation

• What is the use case for this feature?
  I would like to keep track of splits on my datasets, since I often only want to perform some operations on a subset of my dataset
• Why is this use case valuable to support for FiftyOne users in general?
  I expect other people also want to keep track of their splits
• Why is it currently difficult to achieve this use case?
  I don't see a way to set fo.Sample attributes from the importer class

What areas of FiftyOne does this feature affect?

• App: FiftyOne application
• Core: Core fiftyone Python library
• Server: FiftyOne server

Details

Maybe the __next__ function could return a fo.Sample

Willingness to contribute

The FiftyOne Community welcomes contributions! Would you or another member of your organization be willing to contribute an implementation of this feature?

• Yes. I can contribute this feature independently
• Yes. I would be willing to contribute this feature with guidance from the FiftyOne community
• No. I cannot contribute this feature at this time

[brimoor]

@CourchesneA there is a GenericSampleDatasetImporter interface that you can subclass from that allows the __next__ method to return an entire Sample object as you suggest!