mirror of
https://github.com/webclinic017/drift.git
synced 2026-07-28 11:17:47 +00:00
Mark Aron Szulyovszky
41 lines
1.8 KiB
Python
41 lines
1.8 KiB
Python
from sklearn.feature_selection import RFE
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from sklearn.model_selection import TimeSeriesSplit
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import pandas as pd
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from models.base import Model, SKLearnModel
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from utils.scaler import get_scaler
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from utils.types import ScalerTypes
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from utils.hashing import hash_df, hash_series
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from diskcache import Cache
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cache = Cache(".cachedir/feature_selection")
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def select_features(**kwargs) -> pd.DataFrame:
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hashed = kwargs['data_config_hash'] + kwargs['model'].get_name() + str(kwargs['n_features_to_select']) + kwargs['backup_model'].get_name() + kwargs['scaling']
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if hashed in cache:
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return cache.get(hashed)
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else:
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return_value = __select_features(**kwargs)
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cache[hashed] = return_value
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return return_value
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def __select_features(X: pd.DataFrame, y: pd.Series, model: Model, n_features_to_select: int, backup_model: SKLearnModel, scaling: ScalerTypes, data_config_hash: str) -> pd.DataFrame:
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''' Select features using RFECV, returns a pd.DataFrame (X) with only the selected features.'''
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if model.model_type != 'ml': return X
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# 2. Recursive feature selection
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cv = TimeSeriesSplit(n_splits=5)
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scaler = get_scaler(scaling)
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X_scaled = X.copy()
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if scaler is not None:
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X_scaled = scaler.fit_transform(X_scaled)
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feat_selector_model = model.model
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if hasattr(feat_selector_model, 'feature_importances_') == False and hasattr(feat_selector_model, 'coef_') == False:
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feat_selector_model = backup_model.model
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# selector = RFECV(feat_selector_model, cv = cv, step=5, min_features_to_select=min_features_to_select)
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selector = RFE(feat_selector_model, n_features_to_select= n_features_to_select, step=5)
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selector = selector.fit(X_scaled, y)
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print("Kept %d features out of %d" % (selector.n_features_, X_scaled.shape[1]))
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return pd.DataFrame(X[X.columns[selector.support_]], index= X.index)
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