AttributeError: 'ConfigDict' object has no attribute 'train_dir' in SemanticSegmentation

[karantai]

Checklist

• I have searched for similar issues.
• I have tested with the latest development wheel.
• I have checked the release documentation and the latest documentation (for main branch).

Describe the issue

I am trying to perform semantic segmentation but a lot of errors occur while doing that.
Specifically, something is wrong with the definitionopen3d.ml.torch.datasets.Custom3D because when I put it as parameter in SemanticSegmentation I am getting AttributeError: 'ConfigDict' object has no attribute 'train_dir', which resides in customdataset.py into Custom3D class. My input in open3d.ml.torch.datasets.Custom3D is the pcd path.
Do you anything about that?

Steps to reproduce the bug

import sys

from zmq import device
sys.path.append('/home/johnny/Open3D-ML')
from ml3d.torch.dataloaders import get_sampler, TorchDataloader, DefaultBatcher, ConcatBatcher
from ml3d.torch.pipelines import SemanticSegmentation
from open3d.ml.torch.models import RandLANet
import open3d.ml as o3dml

import numpy as np
import open3d as o3d

pcd_path = 'path/to/pcd'
custom_dataset = o3dml.torch.datasets.Custom3D(dataset_path=pcd_path, name='real_complete_pcd')
model = RandLANet(dim_input=3)
custom_model = SemanticSegmentation(
    model= model,
    dataset=custom_dataset,
    device='gpu'
)

Error message

No response

Expected behavior

No response

Open3D, Python and System information

- Operating system: Ubuntu 22.04
- Python version: python 3.10.12
- Open3D version: 0.18.0
- System type: x64
- Is this remote workstation?: no
- How did you install Open3D?: pip
- Compiler version: None

Additional information

No response