update NCE_cn.rst, PRelu_cn.rst, to_variable_cn.rst, test=develop (#1318)
* update NCE_cn.rst, PRelu_cn.rst, to_variable_cn.rst, test=develop * fix NCE, PRelu, to_variable, test=develop * add comment for class Layer, test=develop * add comment for dygraph layer, test=develop * add comment for dygraph layer, test=develop * add comment for name, test=develop * update to_variable_cn.rst, test=develop
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