Predict
gcva_predict(locationId = gcva_region_get(), endpoint, instances)locationId of operation
an `Endpoint` resource name "projects/project/locations/location/endpoints/endpoint"
a json object for online prediction request
Other Endpoints:
gcva_create_endpoint(),
gcva_delete_endpoint(),
gcva_deploy(),
gcva_endpoint(),
gcva_list_endpoints(),
gcva_undeploy(),
gcva_wait_for_model_deploy()