by a regressor such as <code>dnn_regressor</code>
to corresponding <code>tf$parse_example</code> spec. This utility encodes it by getting
related information from users (key, dtype).</p></li>
</ul>
    

    <pre class="usage"><span class='fu'>regressor_parse_example_spec</span>(<span class='no'>feature_columns</span>, <span class='no'>label_key</span>,
  <span class='kw'>label_dtype</span> <span class='kw'>=</span> <span class='no'>tf</span>$<span class='no'>float32</span>, <span class='kw'>label_default</