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wrappers.py
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wrappers.py
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from copy import copy
import numpy as np
from sklearn.grid_search import GridSearchCV
from sklearn.base import BaseEstimator
from sklearn.feature_selection import SelectFromModel
from sklearn.ensemble import RandomForestClassifier
from scipy.sparse import csr_matrix
from xgboost import XGBClassifier
from boruta import BorutaPy
from joblib import Memory
#mem_xgb = Memory(cachedir='cache/xgboost')
#@forward_out("logs/xgb.log")
#@mem_xgb.cache
def fit_xgboost(params, X, y):
clf = XGBClassifier(**params)
clf.fit(X, y)
return clf
class RFWrapper(RandomForestClassifier):
def fit(self, X, y):
self._features_count = X.shape[1]
if X.shape[1] == 0:
X = np.zeros((X.shape[0], 1), dtype=X.dtype)
super(RFWrapper, self).fit(X, y)
return self
def get_support(self, indices=False):
if indices:
return np.arange(self._features_count)
else:
return np.ones(self._features_count, dtype=np.bool)
def predict(self, X):
if X.shape[1] == 0:
X = np.zeros((X.shape[0], 1), dtype=X.dtype)
return super(RFWrapper, self).predict(X)
class GridSearchCVWrapper(GridSearchCV):
def get_support(self, *args, **kwargs):
return self.best_estimator_.get_support(*args, **kwargs)
class ModelBasedFeatureImportanceGetter(BaseEstimator):
def __init__(self, inner_model):
self.inner_model = inner_model
def get_feature_importances(self, X, y):
return self.inner_model.fit(X, y).feature_importances_
def get_support(self, *args, **kwargs):
return self.inner_model.get_support(*args, **kwargs)
class XGBoostClassifierFeatureImportances(XGBClassifier):
@property
def feature_importances_(self):
importances_dict = self.booster().get_fscore()
print importances_dict
result = np.array([importances_dict.get('f{}'.format(i), 0) for i in xrange(self._features_count)], dtype=np.float64)
return result
def fit(self, X, y):
self._features_count = X.shape[1]
if X.shape[1] == 0:
X = np.zeros((X.shape[0], 1))
super(XGBoostClassifierFeatureImportances, self).fit(X, y)
self.__dict__.update(fit_xgboost(self.get_params(), X, y).__dict__)
return self
def get_support(self, indices=False):
if indices:
return np.arange(self._features_count)
else:
return np.ones(self._features_count, dtype=np.bool)
def predict(self, X):
if X.shape[1] == 0:
X = np.zeros((X.shape[0], 1))
return super(XGBoostClassifierFeatureImportances, self).predict(X)
class MatrixCleaningWrapper(BaseEstimator):
def __init__(self, inner_model):
self.inner_model = inner_model
def _drop(self, X):
X = X.drop(self._to_drop, axis=1, inplace=False)
return X.as_matrix()
def get_support(self, indices=False):
if indices == False:
raise KeyError("indices should be true")
support = self.inner_model.get_support(indices=True)
return np.array([self._features_invert_index[el] for el in support])
def _set_dropped(self, X, to_drop):
self._to_drop = to_drop
self._features_invert_index = list()
to_drop_set = set(to_drop)
for el in X.columns.values:
if el not in to_drop_set:
self._features_invert_index.append(el)
def fit(self, X, y):
X = X.copy()
X[X != 1] = 0
ones_count = X.sum(axis=0)
to_drop = ones_count[(ones_count <= 2) |
(ones_count >= (X.shape[0] / 3))].index
self._set_dropped(X, to_drop)
X = self._drop(X)
print "cleaner fit", X.shape
self.inner_model.fit(X, y)
#self.feature_importances_ = self.inner_model.feature_importances_
return self
def predict(self, X):
X = X.copy()
X[X != 1] = 0
X = self._drop(X)
print "cleaner predict:", X.shape
return self.inner_model.predict(X)
class SparseWrapper(BaseEstimator):
def __init__(self, inner_model):
self.inner_model = inner_model
def _to_sparse(self, X):
return csr_matrix(np.array(X))
def get_support(self, *args, **kwargs):
return self.inner_model.get_support(*args, **kwargs)
def set_params(self, n_estimators=None, **params):
super(SparseWrapper, self).set_params(**params)
if n_estimators is not None:
self.inner_model.set_params(n_estimators=n_estimators)
def fit(self, X, y):
X = self._to_sparse(X)
#print "sparser", X.shape
self.inner_model.fit(X, y)
self.feature_importances_ = self.inner_model.feature_importances_
return self
def predict(self, X):
X = self._to_sparse(X)
return self.inner_model.predict(X)
def get_support_for_feature_selection_wrapper(
feature_selector_indices,
inner_indices,
indices,
):
result_support_indices = feature_selector_indices[inner_indices] if sum(feature_selector_indices.shape) > 0 \
else feature_selector_indices
if indices:
return result_support_indices
else:
raise KyeError("indices should be true")
class ModelFeatureSelectionWrapper(BaseEstimator):
def __init__(self, estimator, inner_model, feature_selection_threshold_coef=3):
self.estimator=estimator
self.inner_model = inner_model
self.feature_selector = None
self.feature_selection_threshold_coef = feature_selection_threshold_coef
def _get_feature_selector(self):
if self.feature_selector is None:
self.feature_selector = SelectFromModel(self.estimator,
threshold='{}*mean'.format(float(self.feature_selection_threshold_coef)))
return self.feature_selector
def get_support(self, indices=False):
feature_selector_support = self.feature_selector.get_support(indices=True)
inner_support = self.inner_model.get_support(indices=True)
return get_support_for_feature_selection_wrapper(
feature_selector_support,
inner_support,
indices,
)
def fit(self, X, y):
print X, X.shape
X = self._get_feature_selector().fit(X.copy(), y.copy()).transform(X.copy())
self.inner_model.fit(X.copy(), y)
return self
def predict(self, X):
X = self._get_feature_selector().transform(X.copy())
return self.inner_model.predict(X.copy())
class ModelBasedFeatureImportanceGetter(BaseEstimator):
def __init__(self, inner_model):
self.inner_model = inner_model
def get_feature_importances(self, X, y):
return self.inner_model.fit(X, y).feature_importances_
def get_support(self, indices=False):
return self._inner_model.get_support(indices=indices)
class SubsetGeneratorWrapper:
def __init__(self, gen_getter):
self._gen_getter = gen_getter
def __getattr__(self, attr):
return self._gen_getter().__getattribute__(attr)
def __getinitargs__(self):
return [self._gen_getter]
class AsMatrixWrapper(BaseEstimator):
def __init__(self, inner_model):
self.inner_model = inner_model
def fit(self, X, y):
self._feature_names = np.array(list(X.columns.values))
self.inner_model.fit(X.as_matrix(), y)
return self
def predict(self, X):
return self.inner_model.predict(X.as_matrix())
def get_support(self, indices=False):
if indices == False:
raise KeyError("indices should be true")
return self._feature_names[self.inner_model.get_support(indices=True)]
class LogisticRegressionWrapper(BaseEstimator):
def __init__(self, lr):
self.lr = lr
def fit(self, X, y):
self._features_count = X.shape[1]
if self._features_count == 0:
X = np.zeros((X.shape[0], 1), dtype=X.dtype)
self.lr.fit(X, y)
print "LR: ", X.shape,
self.feature_importances_ = self.lr.coef_.ravel()
print "LR: ", X.shape, self.feature_importances_.shape
return self
def predict(self, X):
if self._features_count == 0:
X = np.zeros((X.shape[0], 1), dtype=X.dtype)
return self.lr.predict(X)
def get_support(self, indices=False):
if indices:
return np.arange(self._features_count)
else:
return np.ones(self._features_count, dtype=np.bool)
mem_boruta = Memory(cachedir='cache/boruta')
@mem_boruta.cache
def boruta_fit_transform(estimator, X, y):
feature_selector = BorutaPy(estimator)
X = feature_selector.fit_transform(X, y)
return X, feature_selector
class BorutaWrapper(BaseEstimator):
def __init__(self, inner_model):
self.estimator = RandomForestClassifier(n_estimators=100)
self.inner_model = inner_model
def fit(self, X, y):
if len(X.shape) == 2 and X.shape[1] >= 1:
X, self._feature_selector = boruta_fit_transform(self.estimator, X, y)
else:
X = np.ones((X.shape[0], 1), dtype=np.int64)
self.inner_model.fit(X, y)
return self
def predict(self, X):
if len(X.shape) == 2 and X.shape[1] >= 1:
X = self._feature_selector.transform(X)
else:
X = np.ones((X.shape[0], 1), dtype=np.int64)
return self.inner_model.predict(X)
def get_support(self, indices=False):
feature_selector_mask = self._feature_selector.support_
feature_selector_indices = feature_selector_mask.nonzero()[0]
inner_model_indices = self.inner_model.get_support(indices=True)
return get_support_for_feature_selection_wrapper(
feature_selector_indices,
inner_model_indices,
indices,
)
class SelectKBestWrapper(BaseEstimator):
def __init__(self, inner_model, k_best):
self.inner_model = inner_model
self.k_best = k_best
def _fix_params(self, X, y):
self.k_best.set_params(k=min(self.k_best.get_params()['k'], X.shape[1]))
def fit(self, X, y):
self._fix_params(X, y)
X = self.k_best.fit_transform(X, y)
self.inner_model.fit(X, y)
return self
def predict(self, X):
X = self.k_best.transform(X)
return self.inner_model.predict(X)
def get_support(self, indices=False):
feature_selector_support = self.k_best.get_support(indices=True)
inner_model_support = self.inner_model.get_support(indices=True)
return get_support_for_feature_selection_wrapper(
feature_selector_support,
inner_model_support,
indices,
)