AbstractTensorHandlePtr fMinus(f_outputs[0]);

    // Take Difference of both estimates: (f(theta + eps) - f(theta - eps)).
    TF_RETURN_IF_ERROR(
        ops::Sub(ctx, fPlus.get(), fMinus.get(), f_outputs, "sub_top"));
    AbstractTensorHandlePtr fDiff(f_outputs[0]);

    // Calculate using the difference quotient definition:
    // (f(theta + eps) - f(theta - eps)) / (2 * eps).
    TF_RETURN_IF_ERROR(

      <w>preloading</w>
      <w>preprocess</w>
      <w>proximities</w>
      <w>redeclarations</w>
      <w>reparsed</w>
      <w>smap</w>
      <w>subclassed</w>
      <w>subgraph</w>
      <w>substep</w>
      <w>tailrec</w>
      <w>typealias</w>
    </words>
  </dictionary>