Batch score command fails

[nirmal-mani]

Following the steps from https://github.com/Azure/Machine-Learning-Operationalization/blob/master/samples/spark/tutorials/batch/batchwebservices.ipynb

Executing the spark batch sample on local cluster. While provisioning the service it throws:
[nmani@azureml batch]$ az ml service create batch -f batch_score.py -n batchwebservice -i --input-data -i --trained-model=food_inspection.model -o --output-data=food_inspection_predictions.parquet az ml service create batch: error: argument --output/-o: expected one argument