xiaohui-sun commented on a change in pull request #4202: [TE] Evaluation metrics store URL: https://github.com/apache/incubator-pinot/pull/4202#discussion_r283077349
########## File path: thirdeye/thirdeye-pinot/src/main/java/org/apache/pinot/thirdeye/detection/Evaluation.java ########## @@ -0,0 +1,49 @@ +/* + * + * * Licensed to the Apache Software Foundation (ASF) under one + * * or more contributor license agreements. See the NOTICE file + * * distributed with this work for additional information + * * regarding copyright ownership. The ASF licenses this file + * * to you under the Apache License, Version 2.0 (the + * * "License"); you may not use this file except in compliance + * * with the License. You may obtain a copy of the License at + * * + * * http://www.apache.org/licenses/LICENSE-2.0 + * * + * * Unless required by applicable law or agreed to in writing, + * * software distributed under the License is distributed on an + * * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * * KIND, either express or implied. See the License for the + * * specific language governing permissions and limitations + * * under the License. + * + * + */ + +package org.apache.pinot.thirdeye.detection; + +import org.apache.pinot.thirdeye.dataframe.DoubleSeries; + + +/** + * The util class for model evaluation + */ +public class Evaluation { + // Suppresses default constructor, ensuring non-instantiability. + private Evaluation() { + } + + /** + * Calculate the mean absolute percentage error (MAPE). + * See https://en.wikipedia.org/wiki/Mean_absolute_percentage_error + * @param current current time series + * @param predicted baseline time series + * @return the mape value + */ + public static double calculateMape(DoubleSeries current, DoubleSeries predicted) { + if (current.contains(0.0)) { + return Double.POSITIVE_INFINITY; + } + return predicted.divide(current).subtract(1).abs().mean().getDouble(0); Review comment: predicted.divide(current).subtract(1).abs().mean().value() to get the first double. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
