* @param param provides ArgMaxParameter argmax_param, * with ArgMaxLayer options: * - top_k (\b optional uint, default 1). * the number @f$ K @f$ of maximal items to output. * - out_max_val (\b optional bool, default false). * if set, output a vector of pairs (max_ind, max_val) unless axis is set then * output max_val along the specified axis. * - axis (\
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