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For each algorithm, developers need to implement a train operator and a prediction operator. Take Kmeans as an example, developers need to implement a KmeansTrainOp and KmeansPredictOp to describe the training and prediction logic. The input and output of a train operator are the training data and the model data, respectively. The inputs of a prediction operator are the model data and the data used for prediction. The output of a prediction operator is the prediction results.

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