code: func initPolicyFromFile(policyFile string, policy *schedulerapi.Policy) error {
  	// Use a policy serialized in a file.
  	_, err := os.Stat(policyFile)
  	if err != nil {
  		return fmt.Errorf("missing policy config file %s", policyFile)
  	}
  	data, err := ioutil.ReadFile(policyFile)
  	if err != nil {
  		return fmt.Errorf("couldn't read policy config: %v", err)
  	}
  	err = runtime.DecodeInto(latestschedulerapi.Codec, []byte(data), policy)
  	if err != nil {
  		return fmt.Errorf("invalid policy: %v", err)
  	}
  	return nil
  }
docs: // initPolicyFromFile initialize policy from file