ModuleNotFoundError: No module named 'class_resolver'

[ewroginek]

🐛 Describe the bug

In the examples folder, running _dgcnnclassification.py and/or _pointnet2classification.py produces the following error:

Traceback (most recent call last):
  File "~/pytorch_geometric/examples/pointnet2_classification.py", line 98, in <module>
    model = Net().to(device)
  File "~/pytorch_geometric/examples/pointnet2_classification.py", line 48, in __init__
    self.sa1_module = SAModule(0.5, 0.2, MLP([3, 64, 64, 128]))
  File "~/.conda/envs/MCB/lib/python3.10/site-packages/torch_geometric/nn/models/mlp.py", line 83, in __init__
    from class_resolver.contrib.torch import activation_resolver
ModuleNotFoundError: No module named 'class_resolver'

I think this might be a new bug that emerged recently since the last few weeks

Environment

• PyG version: 2.0.4
• PyTorch version: 1.12.0
• OS: Mac
• Python version: 3.10.4
• CUDA/cuDNN version: 11.3/8.3.2_0
• How you installed PyTorch and PyG (conda, pip, source):
• conda install pytorch torchvision -c pytorch
• pip install torch-scatter torch-sparse torch-cluster torch-spline-conv torch-geometric
• Any other relevant information (e.g., version of torch-scatter): torch-cluster 1.6.0, torch-scatter 2.0.9, torch-sparse 0.6.14, torchvision 0.13.0

[rusty1s]

The class-resolver is an optional dependency in 2.0.4 (and dropped completely in master right now). You can fix the issue by just running pip install class-resolver.