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Subkey      Description                                                                                                                                            
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use         If True, use feature imputation methods to replace NaN values. If False, all NaN features will be set to zero.                                         
strategy    Method to be used for imputation.                                                                                                                      
n_neighbors When using k-Nearest Neighbors (kNN) for feature imputation, determines the number of neighbors used for imputation. Can be a single integer or a list.
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