<p>In <a href="https://github.com/mlpack/mlpack/pull/757#discussion_r73980642">src/mlpack/methods/ann/layer/inception_layer.hpp</a>:</p>
<pre style='color:#555'>&gt; +    // Forward pass for 3x3 pool path. 
&gt; +    pool3.InputParameter() = input;
&gt; +    pool3.Forward(input, pool3.OutputParameter());
&gt; +    Pad(pool3.OutputParameter(), 1, 1, convPool.InputParameter());
&gt; +    convPool.Forward(pool3.OutputParameter(), convPool.OutputParameter());
&gt; +    biasPool.Forward(convPool.OutputParameter(), biasPool.OutputParameter());
&gt; +    basePool.InputParameter() = biasPool.OutputParameter();
&gt; +    basePool.Forward(convPool.OutputParameter(), basePool.OutputParameter());
&gt; +
&gt; +    // concatenate outputs of all the paths.
&gt; +    output = arma::join_slices( 
&gt; +              arma::join_slices(
&gt; +                arma::join_slices( 
&gt; +                  base1.OutputParameter(), base3.OutputParameter() ), 
&gt; +                  base5.OutputParameter() ), basePool.OutputParameter());
&gt; +
</pre>
<p>Since the network class initializes the weights, you have to define the size e.g. using:</p>

<pre><code>weights.set_size(rows, cols);
</code></pre>

<p>Since the inception layer combines different layer, we have to calculate the overall weight dimension accordingly. You can get the weight dimension of each layer by calling the weight function:</p>

<pre><code>conv1.Weights().n_rows
conv1.Weights().n_cols
</code></pre>

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