Running into error with ChaCha

[robme-l]

I am using the basic ChaCha setup found in the User Guide autovw = AutoVW(max_live_model_num=5, search_space={'interactions': AutoVW.AUTOMATIC})

however when running the line: autovw.learn(sample) where sample is a VowpalWabbit formatted string that works well on a regular (and separate) VowpalWabbit environment, I get the following error:

[/usr/local/lib/python3.10/dist-packages/flaml/onlineml/autovw.py](https://localhost:8080/#) in learn(self, data_sample)
    173         """
    174         self._iter += 1
--> 175         self._trial_runner.step(data_sample, (self._y_predict, self._best_trial))
    176 
    177     def _select_best_trial(self):

AttributeError: 'NoneType' object has no attribute 'step'

Note I am running this on Google Colab. Anyone ever encounter this before?

[sonichi]

@qingyun-wu