53 lines
2.1 KiB
Java
53 lines
2.1 KiB
Java
/*******************************************************************************
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* Copyright (c) 2015-2018 Skymind, Inc.
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*
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* This program and the accompanying materials are made available under the
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* terms of the Apache License, Version 2.0 which is available at
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* https://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* SPDX-License-Identifier: Apache-2.0
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******************************************************************************/
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package org.datavec.api.transform;
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import org.datavec.api.transform.reduce.AggregableColumnReduction;
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import org.datavec.api.transform.reduce.Reducer;
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/**ReduceOp defines the type of column reductions that can be used when reducing
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* a set of values to a single value.<br>
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*
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* Min: take the minimum value<br>
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* Max: take the maximum value<br>
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* Range: output the value max-min<br>
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* Sum: Reduce by summing all values<br>
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* Mean: Reduce by taking the arithmetic mean of the values<br>
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* Stdev: Reduce by calculating the sample standard deviation<br>
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* Count: Reduce by doing a simple count<br>
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* CountUnique: Reduce by counting the number of unique values<br>
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* TakeFirst: Take the first possible value in the list<br>
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* TakeLast: Take the last possible value in the list<br>
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*
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* <b>Note</b>: For custom reduction operations with {@link Reducer}
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* , use the {@link AggregableColumnReduction}
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* functionality.
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*
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* @author Alex Black
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*/
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public enum ReduceOp {
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Prod, Min, Max, Range, //Max - Min
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Append, Prepend, // String operations : concatenate, concatenate with commuted arguments
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Sum, Mean, Stdev, // with Bessel's correction
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UncorrectedStdDev, //without
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Variance, // with Bessel's correction
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PopulationVariance, // without
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Count, CountUnique, TakeFirst, //First value
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TakeLast //Last value
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}
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