lindong28 commented on a change in pull request #28:
URL: https://github.com/apache/flink-ml/pull/28#discussion_r754831435



##########
File path: 
flink-ml-lib/src/main/java/org/apache/flink/ml/common/param/HasEpsilon.java
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@@ -0,0 +1,43 @@
+/*
+ * 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.flink.ml.common.param;
+
+import org.apache.flink.ml.param.DoubleParam;
+import org.apache.flink.ml.param.Param;
+import org.apache.flink.ml.param.ParamValidators;
+import org.apache.flink.ml.param.WithParams;
+
+/** Interface for the shared epsilon param. */
+public interface HasEpsilon<T> extends WithParams<T> {

Review comment:
       I have similar thoughts as @yunfengzhou-hub. Here are my findings that 
may be useful to consider here.
   
   Spark and Scikit-learn [1] uses HasTol for this purpose. Logistic Regression 
wiki [2] mentions tolerance instead of epsilon. I searched on Google for words 
that are commonly used for determining the "termination criteria". It looks 
like tolerance is much more popular than epsilon in the machine learning domain 
(e.g. [3]).
   
   [1] 
https://scikit-learn.org/stable/modules/generated/sklearn.linear_model.SGDClassifier.html
   [2] https://en.wikipedia.org/wiki/Logistic_regression
   [3] 
https://support.minitab.com/en-us/minitab/18/help-and-how-to/modeling-statistics/regression/how-to/nonlinear-regression/interpret-the-results/all-statistics-and-graphs/methods-and-starting-values/




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