NodeBipartiteObs object has no attribute variable_features

[prachishah6795]

Describe the bug

I am trying to run the example for branching-imitation (https://github.com/ds4dm/ecole/tree/master/examples/branching-imitation) and am getting the following error - 'ecole.core.observation.NodeBipartiteObs' object has no attribute 'variable_features'

Detailed log - Traceback (most recent call last): File "/home/pshah398/LearningToBranch/EcoleGasseEtAl/branching-imitation/example.py", line 408, in observation = train_data[0].to(DEVICE) File "/home/pshah398/anaconda3/envs/ecole_env/lib/python3.10/site-packages/torch_geometric/data/dataset.py", line 197, in getitem data = self.get(self.indices()[idx]) File "/home/pshah398/LearningToBranch/EcoleGasseEtAl/branching-imitation/example.py", line 235, in get variable_features = sample_observation.variable_features AttributeError: 'ecole.core.observation.NodeBipartiteObs' object has no attribute 'variable_features'

Setting

• OS: Linux
• Python version: 3.10.5
• Ecole version: 0.7.3

To Reproduce

Run the file example.ipynb at https://github.com/ds4dm/ecole/tree/master/examples/branching-imitation