normal_fn</span><span class='op'>(</span>is_singular <span class='op'>=</span> <span class='cn'>TRUE</span><span class='op'>)</span>,
  bias_posterior_tensor_fn <span class='op'>=</span> <span class='kw'>function</span><span class='op'>(</span><span class='va'>d</span><span class='op'>)</span> <span class='va'>d</span> <span class='op'>%&gt;%</span> <span class='fu'><a href='tfd_sample.html'>tfd_sample</a></span><span class='op'>(</span><span class='op'>)</span>,
  bias_prior_fn <span class='op'>=</span> <s