artemmalykh commented on a change in pull request #5767: [ML] IGNITE-10573: 
Consistent API for Ensemble training
URL: https://github.com/apache/ignite/pull/5767#discussion_r247885725
 
 

 ##########
 File path: 
modules/ml/src/main/java/org/apache/ignite/ml/composition/DatasetMapping.java
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 @@ -0,0 +1,68 @@
+/*
+ * 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.ignite.ml.composition;
+
+import org.apache.ignite.ml.math.functions.IgniteFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
+
+/**
+ * This class represents dataset mapping. This is just a tuple of two 
mappings: one for features and one for labels.
+ *
+ * @param <L1> Type of labels before mapping.
+ * @param <L2> Type of labels after mapping.
+ */
+public interface DatasetMapping<L1, L2> {
 
 Review comment:
   For the moment, no.

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