Sets learning parameters for SOM

1 | ```
setLearningPar(som, alpha = 0.1, sigma = 1, neighbor = 2)
``` |

`som` |
target som. |

`alpha` |
learning rate. |

`sigma` |
variance of the weights propagation. |

`neighbor` |
size of neighborhood kernel about the nodes. 1 indicates the neighbors of a node are its one adjacents. |

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