How to create an ensemble that gives precedence to a specific classifier2019 Community Moderator ElectionMeasuring performance of different classifiers with different sample sizesMulti-label text classification with minimum confidence thresholdunbalanced data classificationBad classification performance of logistic regression on imbalanced data in testing as compared to trainingHow much should I pay attention to the f1 score on this case?Sci-kit learn function to select threshold for higher recall than precisionBinary classification, precision-recall curve and thresholdsClassifier that optimizes performance on only a subset of the data?Why is the area under the precision-recall curve not used as scoring function more often?Improve precision of binary classification - SVM in Matlab

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How to create an ensemble that gives precedence to a specific classifier



2019 Community Moderator ElectionMeasuring performance of different classifiers with different sample sizesMulti-label text classification with minimum confidence thresholdunbalanced data classificationBad classification performance of logistic regression on imbalanced data in testing as compared to trainingHow much should I pay attention to the f1 score on this case?Sci-kit learn function to select threshold for higher recall than precisionBinary classification, precision-recall curve and thresholdsClassifier that optimizes performance on only a subset of the data?Why is the area under the precision-recall curve not used as scoring function more often?Improve precision of binary classification - SVM in Matlab










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Suppose that in a binary classification task, I have separate classifiers A, B, and C. If I use A alone, I will get a high precision, but low recall. In other words, the number of true positives are very high, but it also incorrectly tags the rest of the labels as False. B, and C have much lower precision, but when used separately, they may (or may not) result in better recall. How can I define an ensemble classifier that gives precedence to classifier A only in cases where it labels the data as True and give more weight to the predictions of other classifiers when A predicts the label as False.



The idea is, A is already outperforming others in catching true positives and I only want to improve the recall without hurting precision.










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bumped to the homepage by Community 16 hours ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.










  • 4




    $begingroup$
    Ensemble models learn the correct weights for you. Read about boosting and stacking. You can tune the ensemble classifier to yield the recall/precision trade-off you desire. Welcome to the site!
    $endgroup$
    – Emre
    Jan 11 '18 at 19:27










  • $begingroup$
    can you describe the data? what kind of classifiers you are using?
    $endgroup$
    – Bashar Haddad
    Apr 12 '18 at 0:35















2












$begingroup$


Suppose that in a binary classification task, I have separate classifiers A, B, and C. If I use A alone, I will get a high precision, but low recall. In other words, the number of true positives are very high, but it also incorrectly tags the rest of the labels as False. B, and C have much lower precision, but when used separately, they may (or may not) result in better recall. How can I define an ensemble classifier that gives precedence to classifier A only in cases where it labels the data as True and give more weight to the predictions of other classifiers when A predicts the label as False.



The idea is, A is already outperforming others in catching true positives and I only want to improve the recall without hurting precision.










share|improve this question









$endgroup$




bumped to the homepage by Community 16 hours ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.










  • 4




    $begingroup$
    Ensemble models learn the correct weights for you. Read about boosting and stacking. You can tune the ensemble classifier to yield the recall/precision trade-off you desire. Welcome to the site!
    $endgroup$
    – Emre
    Jan 11 '18 at 19:27










  • $begingroup$
    can you describe the data? what kind of classifiers you are using?
    $endgroup$
    – Bashar Haddad
    Apr 12 '18 at 0:35













2












2








2





$begingroup$


Suppose that in a binary classification task, I have separate classifiers A, B, and C. If I use A alone, I will get a high precision, but low recall. In other words, the number of true positives are very high, but it also incorrectly tags the rest of the labels as False. B, and C have much lower precision, but when used separately, they may (or may not) result in better recall. How can I define an ensemble classifier that gives precedence to classifier A only in cases where it labels the data as True and give more weight to the predictions of other classifiers when A predicts the label as False.



The idea is, A is already outperforming others in catching true positives and I only want to improve the recall without hurting precision.










share|improve this question









$endgroup$




Suppose that in a binary classification task, I have separate classifiers A, B, and C. If I use A alone, I will get a high precision, but low recall. In other words, the number of true positives are very high, but it also incorrectly tags the rest of the labels as False. B, and C have much lower precision, but when used separately, they may (or may not) result in better recall. How can I define an ensemble classifier that gives precedence to classifier A only in cases where it labels the data as True and give more weight to the predictions of other classifiers when A predicts the label as False.



The idea is, A is already outperforming others in catching true positives and I only want to improve the recall without hurting precision.







classification prediction ensemble-modeling binary ensemble






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share|improve this question




share|improve this question










asked Jan 11 '18 at 19:13









Clement AttleeClement Attlee

111




111





bumped to the homepage by Community 16 hours ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.







bumped to the homepage by Community 16 hours ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.









  • 4




    $begingroup$
    Ensemble models learn the correct weights for you. Read about boosting and stacking. You can tune the ensemble classifier to yield the recall/precision trade-off you desire. Welcome to the site!
    $endgroup$
    – Emre
    Jan 11 '18 at 19:27










  • $begingroup$
    can you describe the data? what kind of classifiers you are using?
    $endgroup$
    – Bashar Haddad
    Apr 12 '18 at 0:35












  • 4




    $begingroup$
    Ensemble models learn the correct weights for you. Read about boosting and stacking. You can tune the ensemble classifier to yield the recall/precision trade-off you desire. Welcome to the site!
    $endgroup$
    – Emre
    Jan 11 '18 at 19:27










  • $begingroup$
    can you describe the data? what kind of classifiers you are using?
    $endgroup$
    – Bashar Haddad
    Apr 12 '18 at 0:35







4




4




$begingroup$
Ensemble models learn the correct weights for you. Read about boosting and stacking. You can tune the ensemble classifier to yield the recall/precision trade-off you desire. Welcome to the site!
$endgroup$
– Emre
Jan 11 '18 at 19:27




$begingroup$
Ensemble models learn the correct weights for you. Read about boosting and stacking. You can tune the ensemble classifier to yield the recall/precision trade-off you desire. Welcome to the site!
$endgroup$
– Emre
Jan 11 '18 at 19:27












$begingroup$
can you describe the data? what kind of classifiers you are using?
$endgroup$
– Bashar Haddad
Apr 12 '18 at 0:35




$begingroup$
can you describe the data? what kind of classifiers you are using?
$endgroup$
– Bashar Haddad
Apr 12 '18 at 0:35










2 Answers
2






active

oldest

votes


















0












$begingroup$

Feature-Weighted Linear Stacking might be what you are looking for.




FWLS combines model predictions linearly using coefficients that are
themselves linear functions of meta-features.




In your example you can use the meta-feature "Does A label the example as True?"






share|improve this answer









$endgroup$




















    0












    $begingroup$

    based on your description, it looks like different models have different biases. two important questions: do you have any data imbalance problem? what kind of models you are using? using stacking based classifier is beneficial if you have different biases. Try to use a simple stack based classifier.
    for your level-1 classifier, use different models (e.g. SVM-L, SVM-NL, DT, RF, ... etc). For your meta-data, use probabilities and for the meta-classifier use Random Forest.



    if you have data imbalance problem using stack based classifier is a little bit more challenging.






    share|improve this answer









    $endgroup$













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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      0












      $begingroup$

      Feature-Weighted Linear Stacking might be what you are looking for.




      FWLS combines model predictions linearly using coefficients that are
      themselves linear functions of meta-features.




      In your example you can use the meta-feature "Does A label the example as True?"






      share|improve this answer









      $endgroup$

















        0












        $begingroup$

        Feature-Weighted Linear Stacking might be what you are looking for.




        FWLS combines model predictions linearly using coefficients that are
        themselves linear functions of meta-features.




        In your example you can use the meta-feature "Does A label the example as True?"






        share|improve this answer









        $endgroup$















          0












          0








          0





          $begingroup$

          Feature-Weighted Linear Stacking might be what you are looking for.




          FWLS combines model predictions linearly using coefficients that are
          themselves linear functions of meta-features.




          In your example you can use the meta-feature "Does A label the example as True?"






          share|improve this answer









          $endgroup$



          Feature-Weighted Linear Stacking might be what you are looking for.




          FWLS combines model predictions linearly using coefficients that are
          themselves linear functions of meta-features.




          In your example you can use the meta-feature "Does A label the example as True?"







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Jan 11 '18 at 20:06









          ImranImran

          1,756619




          1,756619





















              0












              $begingroup$

              based on your description, it looks like different models have different biases. two important questions: do you have any data imbalance problem? what kind of models you are using? using stacking based classifier is beneficial if you have different biases. Try to use a simple stack based classifier.
              for your level-1 classifier, use different models (e.g. SVM-L, SVM-NL, DT, RF, ... etc). For your meta-data, use probabilities and for the meta-classifier use Random Forest.



              if you have data imbalance problem using stack based classifier is a little bit more challenging.






              share|improve this answer









              $endgroup$

















                0












                $begingroup$

                based on your description, it looks like different models have different biases. two important questions: do you have any data imbalance problem? what kind of models you are using? using stacking based classifier is beneficial if you have different biases. Try to use a simple stack based classifier.
                for your level-1 classifier, use different models (e.g. SVM-L, SVM-NL, DT, RF, ... etc). For your meta-data, use probabilities and for the meta-classifier use Random Forest.



                if you have data imbalance problem using stack based classifier is a little bit more challenging.






                share|improve this answer









                $endgroup$















                  0












                  0








                  0





                  $begingroup$

                  based on your description, it looks like different models have different biases. two important questions: do you have any data imbalance problem? what kind of models you are using? using stacking based classifier is beneficial if you have different biases. Try to use a simple stack based classifier.
                  for your level-1 classifier, use different models (e.g. SVM-L, SVM-NL, DT, RF, ... etc). For your meta-data, use probabilities and for the meta-classifier use Random Forest.



                  if you have data imbalance problem using stack based classifier is a little bit more challenging.






                  share|improve this answer









                  $endgroup$



                  based on your description, it looks like different models have different biases. two important questions: do you have any data imbalance problem? what kind of models you are using? using stacking based classifier is beneficial if you have different biases. Try to use a simple stack based classifier.
                  for your level-1 classifier, use different models (e.g. SVM-L, SVM-NL, DT, RF, ... etc). For your meta-data, use probabilities and for the meta-classifier use Random Forest.



                  if you have data imbalance problem using stack based classifier is a little bit more challenging.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Apr 12 '18 at 0:39









                  Bashar HaddadBashar Haddad

                  1,2621413




                  1,2621413



























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                      ValueError: Expected n_neighbors <= n_samples, but n_samples = 1, n_neighbors = 6 (SMOTE) The 2019 Stack Overflow Developer Survey Results Are InCan SMOTE be applied over sequence of words (sentences)?ValueError when doing validation with random forestsSMOTE and multi class oversamplingLogic behind SMOTE-NC?ValueError: Error when checking target: expected dense_1 to have shape (7,) but got array with shape (1,)SmoteBoost: Should SMOTE be ran individually for each iteration/tree in the boosting?solving multi-class imbalance classification using smote and OSSUsing SMOTE for Synthetic Data generation to improve performance on unbalanced dataproblem of entry format for a simple model in KerasSVM SMOTE fit_resample() function runs forever with no result