Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Create a new OneHotEncoder preprocessing class.
- Loading branch information
Showing
15 changed files
with
167 additions
and
46 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
119 changes: 119 additions & 0 deletions
119
...rc/main/java/com/datumbox/framework/core/machinelearning/preprocessing/OneHotEncoder.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| /** | ||
| * Copyright (C) 2013-2016 Vasilis Vryniotis <bbriniotis@datumbox.com> | ||
| * | ||
| * Licensed 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 com.datumbox.framework.core.machinelearning.preprocessing; | ||
|
|
||
| import com.datumbox.framework.common.Configuration; | ||
| import com.datumbox.framework.common.concurrency.StreamMethods; | ||
| import com.datumbox.framework.common.dataobjects.*; | ||
| import com.datumbox.framework.common.storageengines.interfaces.StorageEngine; | ||
| import com.datumbox.framework.core.machinelearning.common.abstracts.AbstractTrainer; | ||
| import com.datumbox.framework.core.machinelearning.common.abstracts.transformers.AbstractCategoricalEncoder; | ||
|
|
||
| import java.util.Arrays; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
||
| /** | ||
| * Encodes the categorical columns of the dataset into booleans using the One Hot Encoding method. | ||
| * | ||
| * @author Vasilis Vryniotis <bbriniotis@datumbox.com> | ||
| */ | ||
| public class OneHotEncoder extends AbstractCategoricalEncoder<OneHotEncoder.ModelParameters, OneHotEncoder.TrainingParameters> { | ||
|
|
||
| /** {@inheritDoc} */ | ||
| public static class ModelParameters extends AbstractCategoricalEncoder.AbstractModelParameters { | ||
| private static final long serialVersionUID = 1L; | ||
|
|
||
| /** | ||
| * @param storageEngine | ||
| * @see AbstractTrainer.AbstractModelParameters#AbstractModelParameters(StorageEngine) | ||
| */ | ||
| protected ModelParameters(StorageEngine storageEngine) { | ||
| super(storageEngine); | ||
| } | ||
|
|
||
| } | ||
|
|
||
| /** {@inheritDoc} */ | ||
| public static class TrainingParameters extends AbstractCategoricalEncoder.AbstractTrainingParameters { | ||
| private static final long serialVersionUID = 1L; | ||
|
|
||
| } | ||
|
|
||
| /** | ||
| * @param trainingParameters | ||
| * @param configuration | ||
| * @see AbstractTrainer#AbstractTrainer(AbstractTrainer.AbstractTrainingParameters, Configuration) | ||
| */ | ||
| protected OneHotEncoder(TrainingParameters trainingParameters, Configuration configuration) { | ||
| super(trainingParameters, configuration); | ||
| } | ||
|
|
||
| /** | ||
| * @param storageName | ||
| * @param configuration | ||
| * @see AbstractTrainer#AbstractTrainer(String, Configuration) | ||
| */ | ||
| protected OneHotEncoder(String storageName, Configuration configuration) { | ||
| super(storageName, configuration); | ||
| } | ||
|
|
||
| /** {@inheritDoc} */ | ||
| @Override | ||
| protected void _fit(Dataframe trainingData) { | ||
| //does not learn anything | ||
| } | ||
|
|
||
| /** {@inheritDoc} */ | ||
| @Override | ||
| protected void _transform(Dataframe newData) { | ||
| Map<Object, TypeInference.DataType> columnTypes = newData.getXDataTypes(); | ||
|
|
||
| //Replace variables with dummy versions | ||
| streamExecutor.forEach(StreamMethods.stream(newData.entries(), isParallelized()), e -> { | ||
| Integer rId = e.getKey(); | ||
| Record r = e.getValue(); | ||
|
|
||
| AssociativeArray xData = r.getX().copy(); | ||
|
|
||
| boolean modified = false; | ||
| for(Object column : r.getX().keySet()) { | ||
| if(covert2dummy(columnTypes.get(column))==false) { | ||
| continue; | ||
| } | ||
| Object value = xData.remove(column); //remove the original column | ||
| modified = true; | ||
|
|
||
| //create a new column | ||
| List<Object> newColumn = Arrays.asList(column,value); | ||
|
|
||
| //add a new dummy variable for this column-value combination | ||
| xData.put(newColumn, true); | ||
| } | ||
|
|
||
| if(modified) { | ||
| Record newR = new Record(xData, r.getY(), r.getYPredicted(), r.getYPredictedProbabilities()); | ||
|
|
||
| //we call below the recalculateMeta() | ||
| newData._unsafe_set(rId, newR); | ||
| } | ||
| }); | ||
|
|
||
| //Reset Meta info | ||
| newData.recalculateMeta(); | ||
| } | ||
|
|
||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.