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47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
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from __future__ import annotations
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from transformations.base import Transformation
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from typing import Optional
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from copy import deepcopy
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from sklearn.feature_selection import RFE
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import pandas as pd
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from models.base import Model
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from models.model_map import default_feature_selector_classification
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class RFETransformation(Transformation):
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rfe: RFE
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n_feature_to_select: int
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def __init__(self, n_feature_to_select: int, model: Model, step = 0.1):
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self.n_feature_to_keep = n_feature_to_select
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self.model = model
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if hasattr(self.model, 'model') == False: return
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if hasattr(self.model.model, 'feature_importances_') == False and hasattr(self.model.model, 'coef_') == False:
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model = default_feature_selector_classification
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self.rfe = RFE(model.model, n_features_to_select= n_feature_to_select, step=step)
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def fit(self, X: pd.DataFrame, y: Optional[pd.Series] = None) -> None:
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if self.rfe is None: return
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self.rfe.fit(X, y)
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def fit_transform(self, X: pd.DataFrame, y: Optional[pd.Series] = None) -> pd.DataFrame:
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if self.rfe is None: return X
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self.fit(X, y)
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return self.transform(X)
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def transform(self, X: pd.DataFrame) -> pd.DataFrame:
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if self.rfe is None: return X
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return pd.DataFrame(X[X.columns[self.rfe.support_]], index= X.index)
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def clone(self) -> RFETransformation:
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return deepcopy(self)
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def get_name(self) -> str:
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return "RFE"
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