<p>In <a href="https://github.com/mlpack/mlpack/pull/737#discussion_r74704676">src/mlpack/methods/ann/layer/conv_layer.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -126,7 +132,11 @@ class ConvLayer
&gt;          BackwardConvolutionRule::Convolution(gy.slice(inMap), rotatedFilter,
&gt;              output);
&gt;  
&gt; -        g.slice(outMap) += output;
&gt; +        if (wPad != 0 || hPad != 0)
</pre>
<p>The gradient isn't set if <code>(wPad != 0 || hPad != 0)</code> isn't true. In case <code>(wPad != 0 || hPad != 0)</code>is false the gradient is the output value.</p>

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