<p>1 : remove inputSize from the constructors and data member<br>
2 : provide static function initializeWeight to simplify constructor task<br>
3 : change labels from arma::vec to arma::Row<br>
4 : update test cases</p>

<p>The labels of the SoftmaxRegressionFunction still need to be stored, else InitializeWeights() do not know the number of labels</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>&nbsp;&nbsp;<a href='https://github.com/mlpack/mlpack/pull/457'>https://github.com/mlpack/mlpack/pull/457</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>1 : remove inputSize from the constructors and data member</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/457/files#diff-0">src/mlpack/methods/softmax_regression/softmax_regression.hpp</a>
    (21)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/457/files#diff-1">src/mlpack/methods/softmax_regression/softmax_regression_function.cpp</a>
    (40)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/457/files#diff-2">src/mlpack/methods/softmax_regression/softmax_regression_function.hpp</a>
    (34)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/457/files#diff-3">src/mlpack/methods/softmax_regression/softmax_regression_impl.hpp</a>
    (30)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/457/files#diff-4">src/mlpack/tests/softmax_regression_test.cpp</a>
    (53)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/457.patch'>https://github.com/mlpack/mlpack/pull/457.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/457.diff'>https://github.com/mlpack/mlpack/pull/457.diff</a></li>
</ul>

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