<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'>> + conv3.InputParameter() = input;
> + conv3.Forward(conv3.InputParameter(), conv3.OutputParameter());
> + Test(conv3.OutputParameter(), output);
> +
> + arma::cube error = arma::ones(5, 5, 1);
> + conv3.Backward(conv3.InputParameter(), error, conv3.Delta());
> + Test(conv3.Delta(), arma::ones(5, 5, 4));
> +
> + arma::cube delta = arma::zeros(5, 5, 1);
> + delta(2, 2, 0) = 1;
> + conv3.Gradient(conv3.InputParameter(), delta, conv3.Gradient());
> + arma::cube gradOut(3, 3, 4);
> + arma::mat grad_w;
> + grad_w << 7 << 8 << 9 << arma::endr
> + << 12 << 13 << 14 << arma::endr
> + << 17 << 18 << 19;
</pre>
<p>The rest looks good, thanks!</p>
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