<p>In <a href="https://github.com/mlpack/mlpack/pull/737#discussion_r73970749">src/mlpack/tests/conv_layer_test.cpp</a>:</p>
<pre style='color:#555'>&gt; +  conv3.InputParameter() = input;
&gt; +  conv3.Forward(conv3.InputParameter(), conv3.OutputParameter());
&gt; +  Test(conv3.OutputParameter(), output);
&gt; +  
&gt; +  arma::cube error = arma::ones(5, 5, 1);
&gt; +  conv3.Backward(conv3.InputParameter(), error, conv3.Delta());
&gt; +  Test(conv3.Delta(), arma::ones(5, 5, 4));
&gt; +
&gt; +  arma::cube delta = arma::zeros(5, 5, 1);
&gt; +  delta(2, 2, 0) = 1;
&gt; +  conv3.Gradient(conv3.InputParameter(), delta, conv3.Gradient());
&gt; +  arma::cube gradOut(3, 3, 4);
&gt; +  arma::mat grad_w;
&gt; +  grad_w &lt;&lt; 7 &lt;&lt; 8 &lt;&lt; 9 &lt;&lt; arma::endr
&gt; +        &lt;&lt; 12 &lt;&lt; 13 &lt;&lt; 14 &lt;&lt; arma::endr
&gt; +        &lt;&lt; 17 &lt;&lt; 18 &lt;&lt; 19;
</pre>
<p>The rest looks good, thanks!</p>

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