[BUG] Import of FiftyoneDataset with rel_dir not working as expected

[wayofsamu]

System information

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Ubuntu 22.04
• Python version (python --version): 3.10.8
• FiftyOne version (fiftyone --version): 0.21.0
• FiftyOne installed from (pip or source): pip

Describe the problem

If the rel_dir argument is used for exporting a fo.types.FiftyOneDataset as mentioned here the rel_dir is removed from all media field paths (Segmentation, Heatmap etc.). Source

When importing such a dataset, the rel_dir is not used to fix the paths for these media fields. I do not see an easy fix, as there is no information which media fields exists in a sample. Source

Quick and dirty fix:

for key, value in sd.items():
    if isinstance(value, dict):
        if value.get("_cls") is not None:
            for subkey, _ in value.items():
                if "path" in subkey:
                    sd[key][subkey] = os.path.join(rel_dir, sd[key][subkey]).replace("\\", "/")

What areas of FiftyOne does this bug affect?

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

[wayofsamu]

I also experience some problems when exporting on Windows and importing on Linux. I had to replace the \\ with /.