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Artificial Neural Networks made easy with the FANN library

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28 Aug 2013CPOL24 min read 195.1K   10.6K   206  
Neural networks are typically associated with specialised applications, developed only by select groups of experts. This misconception has had a highly negative effect on its popularity. Hopefully, the FANN library will help fill this gap.
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>fann_print_connections</H1
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>Name</H2
>fann_print_connections&nbsp;--&nbsp;Prints the connections of an ann.</DIV
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>Description</H2
><code
class="methodsynopsis"
>&#13;  <span
class="type"
>void </span
>fann_print_connections(<span
class="methodparam"
><span
class="type"
>struct fann * </span
><span
class="parameter"
>ann</span
></span
>);&#13;</code
><P
>&#13;            <CODE
CLASS="function"
>fann_print_connections</CODE
> will print the connections of the ann in a compact matrix, for easy viewing of the internals of the ann.
	  </P
><P
>&#13;	  The output from fann_print_connections on a small (2 2 1) network trained on the xor problem:
	  <PRE
CLASS="literallayout"
>&#13;Layer / Neuron 012345
L   1 / N    3 ddb...
L   1 / N    4 bbb...
L   2 / N    6 ...cda
	  </PRE
> This network have five real neurons and two bias neurons. This gives a total of seven neurons named from 0 to 6. The connections between these neurons can be seen in the matrix. <CODE
CLASS="constant"
>"."</CODE
> is a place where there is no connection, while a character tells how strong the connection is on a scale from a-z. The two real neurons in the hidden layer (neuron <CODE
CLASS="constant"
>3</CODE
> and <CODE
CLASS="constant"
>4</CODE
> in layer <CODE
CLASS="constant"
>1</CODE
>) has connection from the three neurons in the previous layer as is visible in the first two lines. The output neuron (<CODE
CLASS="constant"
>6</CODE
>) has connections form the three neurons in the hidden layer <CODE
CLASS="constant"
>3 - 5</CODE
> as is visible in the last line.
	</P
><P
> To simplify the matrix output neurons is not visible as neurons that connections can come from, and input and bias neurons are not visible as neurons that connections can go to.
	</P
><P
>This function appears in FANN &#62;= 1.2.0.</P
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