title: Disable file output of hydra
body: <p>I'm using <a href="https://hydra.cc" rel="nofollow noreferrer">hydra</a> to log hyperparameters of experiments.</p>
  <pre class="lang-py prettyprint-override"><code>@hydra.main(config_name=&quot;config&quot;, config_path=&quot;../conf&quot;)
  def evaluate_experiment(cfg: DictConfig) -&gt; None:
      print(OmegaConf.to_yaml(cfg))
      ...
  </code></pre>
  <p>Sometimes I want to do a dry run to check something. For this I don't need any saved parameters, so I'm wondering how I can disable the savings to the filesystem completely in this case?</p>