[GitHub] [flink-ml] lindong28 commented on a diff in pull request #83: [FLINK-27170] Add Transformer and Estimator for OnlineLogisticRegression

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lindong28 commented on code in PR #83:
URL: https://github.com/apache/flink-ml/pull/83#discussion_r860545252


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flink-ml-lib/src/main/java/org/apache/flink/ml/common/param/HasL2.java:
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@@ -0,0 +1,37 @@
+/*
+ * 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 L2 param. */
+public interface HasL2<T> extends WithParams<T> {
+    Param<Double> L_2 = new DoubleParam("l2", "The l2 param.", 0.1, ParamValidators.gt(0.0));

Review Comment:
   @weibozhao Currently the class `LogisticRegression` pass the value of `getReg()` to `LogisticGradient::l2`, which suggests that getReg() actually represents the hyper-parameter l2 for `LogisticRegression`.
   
   Could you explain why we can not get the value of `l2` from `getReg())` for `OnlineLogisticRegression`?



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