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Should I normalize or standardize my dataset for knn?


“Large data” work flows using pandasHow does WEKA IBK (KNN) algorithm lead with non-normalized attributes?Categorical and ordinal feature data difference in regression analysis?Standardization before or after categorical encoding?training a kNN algorithm with different features for each recordHow to normalize and scale data in a dataset with python?Does one-hot encoding cause issues of unbalanced feature?How to change the pipeline output from array to dataframe again with headings after normalizing?How many principal components should I choose for PCA?Do I have to do fit PCA separately for train and test data






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;








3















I trying to use knn for a classification task and my dataset contains categorical features which are one hot encoded, numerical features like price etc.. and also BoW(CountVectorizer) vectors for my text column.



I know knn is affected by scaling. So I am confused what to use here?



from sklearn.preprocessing import StandardScaler
from sklearn.preprocessing import Normalizer
from sklearn.preprocessing import normalize









share|improve this question

















  • 1





    StandardScaler for numerical features should be enough.

    – Sergey Bushmanov
    Mar 9 at 3:10











  • @SergeyBushmanov Many rows in the price column are zeros? Can I still standardize using standardscaler?

    – user214
    Mar 9 at 3:34






  • 1





    Your observation that many prices are zeroes may lead you to an other feature preprocessing pipeline, but in general, one would apply StandardScaler on numerical features with differing scale. This is important for KNN

    – Sergey Bushmanov
    Mar 9 at 4:07












  • @SergeyBushmanov I've a small query. You mentioned to standardize only my numerical features but I've applied PCA on my BoW features and I was thinking whether I should standardize them as well along with numerical features and leave out categorical features.

    – user214
    Mar 9 at 17:42











  • BoW are already well behaving features. I would guess you do not need to standardize them. However, if you wish to you can always cross validate if that makes sense.

    – Sergey Bushmanov
    Mar 9 at 17:52

















3















I trying to use knn for a classification task and my dataset contains categorical features which are one hot encoded, numerical features like price etc.. and also BoW(CountVectorizer) vectors for my text column.



I know knn is affected by scaling. So I am confused what to use here?



from sklearn.preprocessing import StandardScaler
from sklearn.preprocessing import Normalizer
from sklearn.preprocessing import normalize









share|improve this question

















  • 1





    StandardScaler for numerical features should be enough.

    – Sergey Bushmanov
    Mar 9 at 3:10











  • @SergeyBushmanov Many rows in the price column are zeros? Can I still standardize using standardscaler?

    – user214
    Mar 9 at 3:34






  • 1





    Your observation that many prices are zeroes may lead you to an other feature preprocessing pipeline, but in general, one would apply StandardScaler on numerical features with differing scale. This is important for KNN

    – Sergey Bushmanov
    Mar 9 at 4:07












  • @SergeyBushmanov I've a small query. You mentioned to standardize only my numerical features but I've applied PCA on my BoW features and I was thinking whether I should standardize them as well along with numerical features and leave out categorical features.

    – user214
    Mar 9 at 17:42











  • BoW are already well behaving features. I would guess you do not need to standardize them. However, if you wish to you can always cross validate if that makes sense.

    – Sergey Bushmanov
    Mar 9 at 17:52













3












3








3








I trying to use knn for a classification task and my dataset contains categorical features which are one hot encoded, numerical features like price etc.. and also BoW(CountVectorizer) vectors for my text column.



I know knn is affected by scaling. So I am confused what to use here?



from sklearn.preprocessing import StandardScaler
from sklearn.preprocessing import Normalizer
from sklearn.preprocessing import normalize









share|improve this question














I trying to use knn for a classification task and my dataset contains categorical features which are one hot encoded, numerical features like price etc.. and also BoW(CountVectorizer) vectors for my text column.



I know knn is affected by scaling. So I am confused what to use here?



from sklearn.preprocessing import StandardScaler
from sklearn.preprocessing import Normalizer
from sklearn.preprocessing import normalize






python python-3.x machine-learning scikit-learn knn






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 9 at 2:26









user214user214

533115




533115







  • 1





    StandardScaler for numerical features should be enough.

    – Sergey Bushmanov
    Mar 9 at 3:10











  • @SergeyBushmanov Many rows in the price column are zeros? Can I still standardize using standardscaler?

    – user214
    Mar 9 at 3:34






  • 1





    Your observation that many prices are zeroes may lead you to an other feature preprocessing pipeline, but in general, one would apply StandardScaler on numerical features with differing scale. This is important for KNN

    – Sergey Bushmanov
    Mar 9 at 4:07












  • @SergeyBushmanov I've a small query. You mentioned to standardize only my numerical features but I've applied PCA on my BoW features and I was thinking whether I should standardize them as well along with numerical features and leave out categorical features.

    – user214
    Mar 9 at 17:42











  • BoW are already well behaving features. I would guess you do not need to standardize them. However, if you wish to you can always cross validate if that makes sense.

    – Sergey Bushmanov
    Mar 9 at 17:52












  • 1





    StandardScaler for numerical features should be enough.

    – Sergey Bushmanov
    Mar 9 at 3:10











  • @SergeyBushmanov Many rows in the price column are zeros? Can I still standardize using standardscaler?

    – user214
    Mar 9 at 3:34






  • 1





    Your observation that many prices are zeroes may lead you to an other feature preprocessing pipeline, but in general, one would apply StandardScaler on numerical features with differing scale. This is important for KNN

    – Sergey Bushmanov
    Mar 9 at 4:07












  • @SergeyBushmanov I've a small query. You mentioned to standardize only my numerical features but I've applied PCA on my BoW features and I was thinking whether I should standardize them as well along with numerical features and leave out categorical features.

    – user214
    Mar 9 at 17:42











  • BoW are already well behaving features. I would guess you do not need to standardize them. However, if you wish to you can always cross validate if that makes sense.

    – Sergey Bushmanov
    Mar 9 at 17:52







1




1





StandardScaler for numerical features should be enough.

– Sergey Bushmanov
Mar 9 at 3:10





StandardScaler for numerical features should be enough.

– Sergey Bushmanov
Mar 9 at 3:10













@SergeyBushmanov Many rows in the price column are zeros? Can I still standardize using standardscaler?

– user214
Mar 9 at 3:34





@SergeyBushmanov Many rows in the price column are zeros? Can I still standardize using standardscaler?

– user214
Mar 9 at 3:34




1




1





Your observation that many prices are zeroes may lead you to an other feature preprocessing pipeline, but in general, one would apply StandardScaler on numerical features with differing scale. This is important for KNN

– Sergey Bushmanov
Mar 9 at 4:07






Your observation that many prices are zeroes may lead you to an other feature preprocessing pipeline, but in general, one would apply StandardScaler on numerical features with differing scale. This is important for KNN

– Sergey Bushmanov
Mar 9 at 4:07














@SergeyBushmanov I've a small query. You mentioned to standardize only my numerical features but I've applied PCA on my BoW features and I was thinking whether I should standardize them as well along with numerical features and leave out categorical features.

– user214
Mar 9 at 17:42





@SergeyBushmanov I've a small query. You mentioned to standardize only my numerical features but I've applied PCA on my BoW features and I was thinking whether I should standardize them as well along with numerical features and leave out categorical features.

– user214
Mar 9 at 17:42













BoW are already well behaving features. I would guess you do not need to standardize them. However, if you wish to you can always cross validate if that makes sense.

– Sergey Bushmanov
Mar 9 at 17:52





BoW are already well behaving features. I would guess you do not need to standardize them. However, if you wish to you can always cross validate if that makes sense.

– Sergey Bushmanov
Mar 9 at 17:52












1 Answer
1






active

oldest

votes


















1














My suggestion would be to go for MinMaxScaler



One of the major reason is that your features such as price can't have negative values and as you mentioned, it could be sparse.



From Documentation:




The motivation to use this scaling include robustness to very small
standard deviations of features and preserving zero entries in sparse
data.




At the same time, if your numerical variable has a huge variance, then go for RobustScaler or StandardScaler.



You dont have to scale the one hot encoded features.



For BoW, it is important to preserve the sparsity of the data. If you apply the StandardScaler, you will lose the sparsity. You definitely have to go for MinMaxScaler.
Another option would be to go for TfidfVectorizer, which does the l2 normalization by default.






share|improve this answer


















  • 1





    Can I know what you meant by preserving the sparsity of the data. Actually I've used PCA on my BoW and transformed into fewer dimension. So can I now apply scaling to it or let it be.

    – user214
    Mar 9 at 13:44






  • 1





    preserving the sparsity of the data means zeros in the features would be kept as zeros even after Normalization. Sparsity simply means having less number of nonzero values. BoW usually have a lot zeros because every document does not contain all the words in the vocabulary.

    – ai_learning
    Mar 9 at 13:47






  • 1





    yes, you can apply scaling on pca features.

    – ai_learning
    Mar 9 at 13:49












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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














My suggestion would be to go for MinMaxScaler



One of the major reason is that your features such as price can't have negative values and as you mentioned, it could be sparse.



From Documentation:




The motivation to use this scaling include robustness to very small
standard deviations of features and preserving zero entries in sparse
data.




At the same time, if your numerical variable has a huge variance, then go for RobustScaler or StandardScaler.



You dont have to scale the one hot encoded features.



For BoW, it is important to preserve the sparsity of the data. If you apply the StandardScaler, you will lose the sparsity. You definitely have to go for MinMaxScaler.
Another option would be to go for TfidfVectorizer, which does the l2 normalization by default.






share|improve this answer


















  • 1





    Can I know what you meant by preserving the sparsity of the data. Actually I've used PCA on my BoW and transformed into fewer dimension. So can I now apply scaling to it or let it be.

    – user214
    Mar 9 at 13:44






  • 1





    preserving the sparsity of the data means zeros in the features would be kept as zeros even after Normalization. Sparsity simply means having less number of nonzero values. BoW usually have a lot zeros because every document does not contain all the words in the vocabulary.

    – ai_learning
    Mar 9 at 13:47






  • 1





    yes, you can apply scaling on pca features.

    – ai_learning
    Mar 9 at 13:49
















1














My suggestion would be to go for MinMaxScaler



One of the major reason is that your features such as price can't have negative values and as you mentioned, it could be sparse.



From Documentation:




The motivation to use this scaling include robustness to very small
standard deviations of features and preserving zero entries in sparse
data.




At the same time, if your numerical variable has a huge variance, then go for RobustScaler or StandardScaler.



You dont have to scale the one hot encoded features.



For BoW, it is important to preserve the sparsity of the data. If you apply the StandardScaler, you will lose the sparsity. You definitely have to go for MinMaxScaler.
Another option would be to go for TfidfVectorizer, which does the l2 normalization by default.






share|improve this answer


















  • 1





    Can I know what you meant by preserving the sparsity of the data. Actually I've used PCA on my BoW and transformed into fewer dimension. So can I now apply scaling to it or let it be.

    – user214
    Mar 9 at 13:44






  • 1





    preserving the sparsity of the data means zeros in the features would be kept as zeros even after Normalization. Sparsity simply means having less number of nonzero values. BoW usually have a lot zeros because every document does not contain all the words in the vocabulary.

    – ai_learning
    Mar 9 at 13:47






  • 1





    yes, you can apply scaling on pca features.

    – ai_learning
    Mar 9 at 13:49














1












1








1







My suggestion would be to go for MinMaxScaler



One of the major reason is that your features such as price can't have negative values and as you mentioned, it could be sparse.



From Documentation:




The motivation to use this scaling include robustness to very small
standard deviations of features and preserving zero entries in sparse
data.




At the same time, if your numerical variable has a huge variance, then go for RobustScaler or StandardScaler.



You dont have to scale the one hot encoded features.



For BoW, it is important to preserve the sparsity of the data. If you apply the StandardScaler, you will lose the sparsity. You definitely have to go for MinMaxScaler.
Another option would be to go for TfidfVectorizer, which does the l2 normalization by default.






share|improve this answer













My suggestion would be to go for MinMaxScaler



One of the major reason is that your features such as price can't have negative values and as you mentioned, it could be sparse.



From Documentation:




The motivation to use this scaling include robustness to very small
standard deviations of features and preserving zero entries in sparse
data.




At the same time, if your numerical variable has a huge variance, then go for RobustScaler or StandardScaler.



You dont have to scale the one hot encoded features.



For BoW, it is important to preserve the sparsity of the data. If you apply the StandardScaler, you will lose the sparsity. You definitely have to go for MinMaxScaler.
Another option would be to go for TfidfVectorizer, which does the l2 normalization by default.







share|improve this answer












share|improve this answer



share|improve this answer










answered Mar 9 at 8:43









ai_learningai_learning

4,27521036




4,27521036







  • 1





    Can I know what you meant by preserving the sparsity of the data. Actually I've used PCA on my BoW and transformed into fewer dimension. So can I now apply scaling to it or let it be.

    – user214
    Mar 9 at 13:44






  • 1





    preserving the sparsity of the data means zeros in the features would be kept as zeros even after Normalization. Sparsity simply means having less number of nonzero values. BoW usually have a lot zeros because every document does not contain all the words in the vocabulary.

    – ai_learning
    Mar 9 at 13:47






  • 1





    yes, you can apply scaling on pca features.

    – ai_learning
    Mar 9 at 13:49













  • 1





    Can I know what you meant by preserving the sparsity of the data. Actually I've used PCA on my BoW and transformed into fewer dimension. So can I now apply scaling to it or let it be.

    – user214
    Mar 9 at 13:44






  • 1





    preserving the sparsity of the data means zeros in the features would be kept as zeros even after Normalization. Sparsity simply means having less number of nonzero values. BoW usually have a lot zeros because every document does not contain all the words in the vocabulary.

    – ai_learning
    Mar 9 at 13:47






  • 1





    yes, you can apply scaling on pca features.

    – ai_learning
    Mar 9 at 13:49








1




1





Can I know what you meant by preserving the sparsity of the data. Actually I've used PCA on my BoW and transformed into fewer dimension. So can I now apply scaling to it or let it be.

– user214
Mar 9 at 13:44





Can I know what you meant by preserving the sparsity of the data. Actually I've used PCA on my BoW and transformed into fewer dimension. So can I now apply scaling to it or let it be.

– user214
Mar 9 at 13:44




1




1





preserving the sparsity of the data means zeros in the features would be kept as zeros even after Normalization. Sparsity simply means having less number of nonzero values. BoW usually have a lot zeros because every document does not contain all the words in the vocabulary.

– ai_learning
Mar 9 at 13:47





preserving the sparsity of the data means zeros in the features would be kept as zeros even after Normalization. Sparsity simply means having less number of nonzero values. BoW usually have a lot zeros because every document does not contain all the words in the vocabulary.

– ai_learning
Mar 9 at 13:47




1




1





yes, you can apply scaling on pca features.

– ai_learning
Mar 9 at 13:49






yes, you can apply scaling on pca features.

– ai_learning
Mar 9 at 13:49




















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