In order to carry out a learning in which newly acquired data is taken to be more important than data previously accumulated, a function is provided which sets a weight for learning data based on an acquisition order of the learning data. Furthermore, in order to carry out a learning which reflects data acquired in the last cycle and a result with respect to the data, a function is provided which feeds back a result of a learning in the last cycle to a rule and sets a weight for learning data based on a relation between a label of data and a prediction value.
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