celery.py

@celery.task
def async_training_task(data_file_name, k_iterations):
  train_model(file=data_file_name, iterations=k_iterations)
  
# This is the standard flask handler.
# Maybe you get some params from the request/
def get(self, request):
  async_training_task.delay(data_file_name=request.file_name, iterations=10)
  return Response("Training has been started!")