<p>In <a href="https://github.com/mlpack/mlpack/pull/737#discussion_r74704728">src/mlpack/tests/conv_layer_test.cpp</a>:</p>
<pre style='color:#555'>&gt; +    for (size_t j = 0; j &lt; input.n_rows; ++j)
&gt; +    {
&gt; +      input.slice(i).row(j) = a.subvec(vec_idx, vec_idx + 4).t();
&gt; +      vec_idx += 5;
&gt; +    }
&gt; +  }
&gt; +  ConvLayer&lt;&gt; conv3(4, 1, 3, 3, 1, 1, 1, 1);
&gt; +  arma::mat id3 = arma::zeros&lt;arma::mat&gt;(3, 3);
&gt; +  id3(1, 1) = 1;  
&gt; +  arma::cube conv3_w(3, 3, 4 * 1);
&gt; +  for (size_t i = 0; i &lt; conv3_w.n_slices; ++i) 
&gt; +    conv3_w.slice(i) = id3;
&gt; +  conv3.Weights() = conv3_w;
&gt; +  
&gt; +  arma::cube output(5, 5, 1);
&gt; +  output.slice(0) = input.slice(0) * 4;
</pre>
<p>Ah, right, thanks for the clarification.</p>

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