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<h1>neuralpp::Synapsis Class Reference</h1><!-- doxytag: class="neuralpp::Synapsis" -->Class for managing synapsis.
<a href="#_details">More...</a>
<p>
<code>#include &lt;<a class="el" href="neural_09_09_8hpp-source.html">neural++.hpp</a>&gt;</code>
<p>
<p>
<a href="classneuralpp_1_1Synapsis-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#0729de9e737b9967421edcfc4b410bd8">Synapsis</a> (<a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *i, <a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *o, double w, double d)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Constructor. <a href="#0729de9e737b9967421edcfc4b410bd8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#b767332fdce81af25486b8969e5d2fb3">Synapsis</a> (<a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *i, <a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *o, double(*a)(double))</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Constructor. <a href="#b767332fdce81af25486b8969e5d2fb3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#af6b80ab3203bccd2ee4a36f06537517">Synapsis</a> (<a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *i, <a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *o, double w, double(*a)(double))</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Constructor. <a href="#af6b80ab3203bccd2ee4a36f06537517"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#298fd3c7483ad572899fecec01ac8fdf">getIn</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#b46d876761a73a24db87f5a144a0e899">getOut</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#acee77d0fdf9889464ab5ed27beae0ff">setWeight</a> (double w) throw (InvalidSynapticalWeightException)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the weight of the synapsis. <a href="#acee77d0fdf9889464ab5ed27beae0ff"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#429ad5b25930faf436a9d725582802e1">setDelta</a> (double d) throw (InvalidSynapticalWeightException)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">It sets the delta (how much to change the weight after an update) of the synapsis. <a href="#429ad5b25930faf436a9d725582802e1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#bcbf7228632ff4d6bbb67703323d2db0">getWeight</a> () const </td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Return the weight of the synapsis. <a href="#bcbf7228632ff4d6bbb67703323d2db0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#00c8e9c0804662f2b3247d6dddb4ca6c">getDelta</a> () const </td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Return the delta of the synapsis. <a href="#00c8e9c0804662f2b3247d6dddb4ca6c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#0148b9c8db870c928711168702ae51c5">getPrevDelta</a> () const </td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Get the delta of the synapsis at the previous iteration. <a href="#0148b9c8db870c928711168702ae51c5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#cff10a022d4c021688e4df944c05d8bd">momentum</a> (int N, int x) const </td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Get the inertial momentum of a synapsis. <a href="#cff10a022d4c021688e4df944c05d8bd"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Private Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#617fdc4305f8f1850eac267a7ee22660">delta</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#65471cd6c9ef87609dfa4b0e5fafa708">prev_delta</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#0bc523a8135ebbb5c0da932939d30ed7">weight</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#83d41c158054b08bd05051736e89a0ad">in</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#fb219e05038fa0da20db1082ab0500be">out</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double(*&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classneuralpp_1_1Synapsis.html#2539b9eef2ff0f3522aea8d89e394f02">actv_f</a> )(double)</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Class for managing synapsis.
<p>
Don't use this class directly unless you know what you're doing, use <a class="el" href="classneuralpp_1_1NeuralNet.html" title="Main project&#39;s class.">NeuralNet</a> instead <hr><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" name="0729de9e737b9967421edcfc4b410bd8"></a><!-- doxytag: member="neuralpp::Synapsis::Synapsis" ref="0729de9e737b9967421edcfc4b410bd8" args="(Neuron *i, Neuron *o, double w, double d)" -->
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<td class="memname">neuralpp::Synapsis::Synapsis </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td>
<td class="paramname"> <em>i</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td>
<td class="paramname"> <em>o</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double&nbsp;</td>
<td class="paramname"> <em>w</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double&nbsp;</td>
<td class="paramname"> <em>d</em></td><td>&nbsp;</td>
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<td>)</td>
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<p>
Constructor.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>i</em>&nbsp;</td><td>Input neuron </td></tr>
<tr><td valign="top"></td><td valign="top"><em>o</em>&nbsp;</td><td>Output neuron </td></tr>
<tr><td valign="top"></td><td valign="top"><em>w</em>&nbsp;</td><td>Weight for the synapsis </td></tr>
<tr><td valign="top"></td><td valign="top"><em>d</em>&nbsp;</td><td>Delta for the synapsis </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="b767332fdce81af25486b8969e5d2fb3"></a><!-- doxytag: member="neuralpp::Synapsis::Synapsis" ref="b767332fdce81af25486b8969e5d2fb3" args="(Neuron *i, Neuron *o, double(*a)(double))" -->
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<td class="memname">neuralpp::Synapsis::Synapsis </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td>
<td class="paramname"> <em>i</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td>
<td class="paramname"> <em>o</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double(*)(double)&nbsp;</td>
<td class="paramname"> <em>a</em></td><td>&nbsp;</td>
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<td>)</td>
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<p>
Constructor.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>i</em>&nbsp;</td><td>Input neuron </td></tr>
<tr><td valign="top"></td><td valign="top"><em>o</em>&nbsp;</td><td>Output neuron </td></tr>
<tr><td valign="top"></td><td valign="top"><em>a</em>&nbsp;</td><td>Activation function </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="af6b80ab3203bccd2ee4a36f06537517"></a><!-- doxytag: member="neuralpp::Synapsis::Synapsis" ref="af6b80ab3203bccd2ee4a36f06537517" args="(Neuron *i, Neuron *o, double w, double(*a)(double))" -->
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<td class="memname">neuralpp::Synapsis::Synapsis </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td>
<td class="paramname"> <em>i</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a> *&nbsp;</td>
<td class="paramname"> <em>o</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double&nbsp;</td>
<td class="paramname"> <em>w</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double(*)(double)&nbsp;</td>
<td class="paramname"> <em>a</em></td><td>&nbsp;</td>
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<td>)</td>
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<p>
Constructor.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>i</em>&nbsp;</td><td>Input neuron </td></tr>
<tr><td valign="top"></td><td valign="top"><em>o</em>&nbsp;</td><td>Output neuron </td></tr>
<tr><td valign="top"></td><td valign="top"><em>w</em>&nbsp;</td><td>Weight for the synapsis (default: random) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>a</em>&nbsp;</td><td>Activation function </td></tr>
</table>
</dl>
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="298fd3c7483ad572899fecec01ac8fdf"></a><!-- doxytag: member="neuralpp::Synapsis::getIn" ref="298fd3c7483ad572899fecec01ac8fdf" args="() const " -->
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<td class="memname"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a>* neuralpp::Synapsis::getIn </td>
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<td> const</td>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>Reference to input neuron of the synapsis </dd></dl>
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</div><p>
<a class="anchor" name="b46d876761a73a24db87f5a144a0e899"></a><!-- doxytag: member="neuralpp::Synapsis::getOut" ref="b46d876761a73a24db87f5a144a0e899" args="() const " -->
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<td class="memname"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a>* neuralpp::Synapsis::getOut </td>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>Reference to output neuron of the synapsis </dd></dl>
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<a class="anchor" name="acee77d0fdf9889464ab5ed27beae0ff"></a><!-- doxytag: member="neuralpp::Synapsis::setWeight" ref="acee77d0fdf9889464ab5ed27beae0ff" args="(double w)" -->
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<td class="memname">void neuralpp::Synapsis::setWeight </td>
<td>(</td>
<td class="paramtype">double&nbsp;</td>
<td class="paramname"> <em>w</em> </td>
<td>&nbsp;)&nbsp;</td>
<td> throw (<a class="el" href="classneuralpp_1_1InvalidSynapticalWeightException.html">InvalidSynapticalWeightException</a>)</td>
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<p>
Set the weight of the synapsis.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>w</em>&nbsp;</td><td>Weight to be set </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="429ad5b25930faf436a9d725582802e1"></a><!-- doxytag: member="neuralpp::Synapsis::setDelta" ref="429ad5b25930faf436a9d725582802e1" args="(double d)" -->
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<td class="memname">void neuralpp::Synapsis::setDelta </td>
<td>(</td>
<td class="paramtype">double&nbsp;</td>
<td class="paramname"> <em>d</em> </td>
<td>&nbsp;)&nbsp;</td>
<td> throw (<a class="el" href="classneuralpp_1_1InvalidSynapticalWeightException.html">InvalidSynapticalWeightException</a>)</td>
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<p>
It sets the delta (how much to change the weight after an update) of the synapsis.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>d</em>&nbsp;</td><td>Delta to be set </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="bcbf7228632ff4d6bbb67703323d2db0"></a><!-- doxytag: member="neuralpp::Synapsis::getWeight" ref="bcbf7228632ff4d6bbb67703323d2db0" args="() const " -->
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<td class="memname">double neuralpp::Synapsis::getWeight </td>
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<td>&nbsp;)&nbsp;</td>
<td> const</td>
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<p>
Return the weight of the synapsis.
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Weight of the synapsis </dd></dl>
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<a class="anchor" name="00c8e9c0804662f2b3247d6dddb4ca6c"></a><!-- doxytag: member="neuralpp::Synapsis::getDelta" ref="00c8e9c0804662f2b3247d6dddb4ca6c" args="() const " -->
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<td class="memname">double neuralpp::Synapsis::getDelta </td>
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<td> const</td>
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<p>
Return the delta of the synapsis.
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Delta of the synapsis </dd></dl>
</div>
</div><p>
<a class="anchor" name="0148b9c8db870c928711168702ae51c5"></a><!-- doxytag: member="neuralpp::Synapsis::getPrevDelta" ref="0148b9c8db870c928711168702ae51c5" args="() const " -->
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<td class="memname">double neuralpp::Synapsis::getPrevDelta </td>
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<td> const</td>
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<p>
Get the delta of the synapsis at the previous iteration.
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The previous delta </dd></dl>
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<a class="anchor" name="cff10a022d4c021688e4df944c05d8bd"></a><!-- doxytag: member="neuralpp::Synapsis::momentum" ref="cff10a022d4c021688e4df944c05d8bd" args="(int N, int x) const " -->
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<td class="memname">double neuralpp::Synapsis::momentum </td>
<td>(</td>
<td class="paramtype">int&nbsp;</td>
<td class="paramname"> <em>N</em>, </td>
</tr>
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<td class="paramtype">int&nbsp;</td>
<td class="paramname"> <em>x</em></td><td>&nbsp;</td>
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<td>)</td>
<td></td><td></td><td> const</td>
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<p>
Get the inertial momentum of a synapsis.
<p>
This value is inversely proportional to the number of steps done in the learning phase (quite high at the beginning, decreasing to zero towards the end of the learning algorithm), and is needed to avoid strong oscillations in output values at the beginning, caused by the random values assigned to the synaptical weights <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>N</em>&nbsp;</td><td>The number of iterations the network must have to adjust the output values </td></tr>
<tr><td valign="top"></td><td valign="top"><em>x</em>&nbsp;</td><td>The number of iterations already taken </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The inertial momentum of the synapsis </dd></dl>
</div>
</div><p>
<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="617fdc4305f8f1850eac267a7ee22660"></a><!-- doxytag: member="neuralpp::Synapsis::delta" ref="617fdc4305f8f1850eac267a7ee22660" args="" -->
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<td class="memname">double <a class="el" href="classneuralpp_1_1Synapsis.html#617fdc4305f8f1850eac267a7ee22660">neuralpp::Synapsis::delta</a><code> [private]</code> </td>
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<a class="anchor" name="65471cd6c9ef87609dfa4b0e5fafa708"></a><!-- doxytag: member="neuralpp::Synapsis::prev_delta" ref="65471cd6c9ef87609dfa4b0e5fafa708" args="" -->
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<td class="memname">double <a class="el" href="classneuralpp_1_1Synapsis.html#65471cd6c9ef87609dfa4b0e5fafa708">neuralpp::Synapsis::prev_delta</a><code> [private]</code> </td>
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<a class="anchor" name="0bc523a8135ebbb5c0da932939d30ed7"></a><!-- doxytag: member="neuralpp::Synapsis::weight" ref="0bc523a8135ebbb5c0da932939d30ed7" args="" -->
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<td class="memname">double <a class="el" href="classneuralpp_1_1Synapsis.html#0bc523a8135ebbb5c0da932939d30ed7">neuralpp::Synapsis::weight</a><code> [private]</code> </td>
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<a class="anchor" name="83d41c158054b08bd05051736e89a0ad"></a><!-- doxytag: member="neuralpp::Synapsis::in" ref="83d41c158054b08bd05051736e89a0ad" args="" -->
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<td class="memname"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a>* <a class="el" href="classneuralpp_1_1Synapsis.html#83d41c158054b08bd05051736e89a0ad">neuralpp::Synapsis::in</a><code> [private]</code> </td>
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<a class="anchor" name="fb219e05038fa0da20db1082ab0500be"></a><!-- doxytag: member="neuralpp::Synapsis::out" ref="fb219e05038fa0da20db1082ab0500be" args="" -->
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<td class="memname"><a class="el" href="classneuralpp_1_1Neuron.html">Neuron</a>* <a class="el" href="classneuralpp_1_1Synapsis.html#fb219e05038fa0da20db1082ab0500be">neuralpp::Synapsis::out</a><code> [private]</code> </td>
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<a class="anchor" name="2539b9eef2ff0f3522aea8d89e394f02"></a><!-- doxytag: member="neuralpp::Synapsis::actv_f" ref="2539b9eef2ff0f3522aea8d89e394f02" args=")(double)" -->
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<td class="memname">double(* <a class="el" href="classneuralpp_1_1Synapsis.html#2539b9eef2ff0f3522aea8d89e394f02">neuralpp::Synapsis::actv_f</a>)(double)<code> [private]</code> </td>
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="neural_09_09_8hpp-source.html">neural++.hpp</a></ul>
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<hr size="1"><address style="text-align: right;"><small>Generated on Sun Aug 16 20:53:42 2009 for Neural++ by&nbsp;
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
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