<p>In <a href="https://github.com/mlpack/mlpack/pull/737#discussion_r74696663">src/mlpack/tests/conv_layer_test.cpp</a>:</p>
<pre style='color:#555'>> + arma::vec a = arma::linspace<arma::vec>(1, 25, 25);
> + arma::cube input(5, 5, 4);
> + for (size_t i = 0; i < input.n_slices; ++i)
> + {
> + int vec_idx = 0, row_idx = 0;
> + for (size_t j = 0; j < input.n_rows; ++j)
> + {
> + input.slice(i).row(j) = a.subvec(vec_idx, vec_idx + 4).t();
> + vec_idx += 5;
> + }
> + }
> + ConvLayer<> conv3(4, 1, 3, 3, 1, 1, 1, 1);
> + arma::mat id3 = arma::zeros<arma::mat>(3, 3);
> + id3(1, 1) = 1;
> + arma::cube conv3_w(3, 3, 4 * 1);
> + for (size_t i = 0; i < conv3_w.n_slices; ++i)
</pre>
<p>Right now we are using identity kernel for the test. Do you still think we should use some other kernel?</p>
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