In Google's sample code found at cloudml-samples/flowers/sample.sh, between lines 66 and 69, is the argument "region":
# Tell CloudML about a new type of model coming. Think of a "model" here as
# a namespace for deployed Tensorflow graphs.
gcloud ml-engine models create "$MODEL_NAME" \
--region us-central1
Shouldn't "region" be replaced with "regions" to avoid an error?
(I'm not in position to submit a PR about this.)