def select_features_apply(self, df, verbose=False):
"""Apply features selection.
Requires Select_Features method to have been applied
Parameters
----------
df : DataFrame
dataset to apply selection on
verbose : boolean (Default False)
Get logging information
Returns
-------
DataFrame : reduced dataset
"""
# check pipe step and is_fitted
assert self.is_fitted_selector, "fit first (please)"
if verbose:
start_time = time()
print_title1('Apply select_features')
df_local = df.copy()
df_local = self.features_selector.transform(df_local, verbose=verbose)
if verbose:
print('\n\t\t>>>', 'select_features_apply execution time:', round(time() - start_time, 4), 'secs. <<<')
return df_local
def model_train(self, clf='XGBOOST', grid_param=None, top_bagging=False, n_comb=10, comb_seed=None, verbose=False):
"""train models with random search
- creates models with random hyper-parameters combinations from HP grid
- fits models on self
Notes :
- Available classifiers : Random Forest, XGBOOST
- can enable bagging algo with top_bagging parameter
Parameters
----------
clf : string (Default : 'XGBOOST')
classifier used for modelisation
grid_param : dict
random search grid {Hyperparameter name : values list}
top_bagging : boolean (Default : False)
enable Bagging
n_comb : int (Default : 10)
HP combination number
comb_seed : int (Default : None)
random combination seed
verbose : boolean (Default False)
Get logging information
"""
assert self.step in ['preprocess', 'features_selection'], 'apply preprocess method'
df_train = self.copy()
target = self.target
if verbose:
start_time = time()
print_title1('Train Models')
# instantiate Hyperopt object
hyperopt = HyperOpt(classifier=clf, grid_param=grid_param, n_param_comb=n_comb,
bagging=top_bagging, comb_seed=comb_seed)
# fit model on train set
if verbose:
color_print('training models')
# fit hyperopt on self
hyperopt.fit(df_train, self.target, verbose=verbose)
self.d_hyperopt = hyperopt
self.is_fitted_model = True
self.target = target
self.step = 'train_model'
if verbose:
print('\n\t\t>>>', 'model_train execution time:', round(time() - start_time, 4), 'secs. <<<')
def model_predict(self, df, metric='F1', delta_auc=0.03, verbose=False):
"""apply fitted models on a dataset
- identifies valid models |(auc(train)-auc(test)|<0.03
- gets the best model in respect of a selected metric among valid model
Parameters
----------
metric : string (Default : 'F1')
objective metric
verbose : boolean (Default False)
Get logging information
Returns
-------
dict
{model_index : {'HP', 'probas', 'model', 'features_importance', 'train_metrics', 'metrics', 'output'}
list
valid models indexes
int
best model index
DataFrame
models summary
"""
assert self.is_fitted_model, "model is not fitted yet, apply model_train_predict or model_train methods"
if verbose:
start_time = time()
color_print('\napplying models')
# apply models on dataset
d_fitted_models = self.d_hyperopt.predict(df, self.target, delta_auc=delta_auc, verbose=verbose)
# model selection
if verbose:
color_print('\nbest model selection')
best_model_idx, l_valid_models = self.d_hyperopt.get_best_model(d_fitted_models, metric=metric,
delta_auc_th=delta_auc,
verbose=False)
# store model results
df_model_res = self.d_hyperopt.model_res_to_df(d_fitted_models, sort_metric=metric)
if best_model_idx is not None:
print_title1('best model : ' + str(best_model_idx))
print(metric + ' : ' + str(round(d_fitted_models[best_model_idx]['metrics'][metric], 4)))
print('AUC : ' + str(round(d_fitted_models[best_model_idx]['metrics']['Roc_auc'], 4)))
if round(d_fitted_models[best_model_idx]['metrics'][metric], 4) == 1.0:
color_print("C'était pas qu'un physique finalement hein ?", 32)
print('\n\t\t>>>', 'model_predict execution time:', round(time() - start_time, 4), 'secs. <<<')
return d_fitted_models, l_valid_models, best_model_idx, df_model_res
def explore(self, verbose=False):
"""data exploration and features type identification
Note : if you disagree with automated identification, you can directly modify d_features attribute
Create self.d_features : dict {x : list of variables names}
- date: date features
- identifier: identifier features
- verbatim: verbatim features
- boolean: boolean features
- categorical: categorical features
- numerical: numerical features
- NA: features which contains NA values
- low_variance: list of the features with low variance and unique values
Parameters
----------
verbose : boolean (Default False)
Get logging information
"""
if verbose:
start_time = time()
print_title1('Explore')
df_local = self.copy()
if self.target is not None:
df_local = df_local.drop(self.target, axis=1)
# call std_audit_dataset function
self.d_features = explore(
df_local, verbose=verbose)
self.step = 'explore'
# created attributes display
if verbose:
color_print("\nCreated attributes : d_features (dict) ")
print("Keys :")
print(" -> date")
print(" -> identifier")
print(" -> verbatim")
print(" -> boolean")
print(" -> categorical")
print(" -> numerical")
print(" -> date")
print(" -> NA")
print(" -> low_variance")
print('\n\t\t>>>', 'explore execution time:', round(time() - start_time, 4), 'secs. <<<')
def select_features(self, method='pca', verbose=False):
""" fit and apply features selection (optional)
Parameters
----------
method : string (Default pca)
method use to select features
verbose : boolean (Default False)
Get logging information
"""
assert self.step in ['preprocess'], 'apply preprocess method'
target = self.target
if verbose:
start_time = time()
print_title1('Features Selection')
df_local = self.copy()
l_select_var = [col for col in df_local.columns.tolist() if col != self.target]
# df_local = select_features(df=df_local, target=self.target, method=method, verbose=verbose)
features_selector = FeatSelector(method=method)
features_selector.fit(df_local, l_var=l_select_var, verbose=verbose)
df_local = features_selector.transform(df_local, verbose=verbose)
self.__dict__.update(df_local.__dict__)
self.target = target
self.features_selector = features_selector
self.is_fitted_selector = True
self.step = 'features_selection'
if verbose :
print('\n\t\t>>>', 'select_features execution time:', round(time() - start_time, 4), 'secs. <<<')
def model_train_test(self, clf='XGBOOST', grid_param=None, metric='F1', delta_auc=0.03, top_bagging=False, n_comb=10,
comb_seed=None,
verbose=False):
"""train and test models with random search
- creates models with random hyper-parameters combinations from HP grid
- splits (random 80/20) train/test sets to fit/apply models
- identifies valid models |(auc(train)-auc(test)|<0.03
- gets the best model in respect of a selected metric among valid model
Notes :
- Available classifiers : Random Forest, XGBOOST
- can enable bagging algo with top_bagging parameter
Parameters
----------
clf : string (Default : 'XGBOOST')
classifier used for modelisation
grid_param : dict
random search grid {Hyperparameter name : values list}
metric : string (Default : 'F1')
objective metric
top_bagging : boolean (Default : False)
enable Bagging
n_comb : int (Default : 10)
HP combination number
comb_seed : int (Default : None)
random combination seed
verbose : boolean (Default False)
Get logging information
Returns
-------
dict
{model_index : {'HP', 'probas', 'model', 'features_importance', 'train_metrics', 'metrics', 'output'}
list
valid models indexes
int
best model index
DataFrame
models summary
"""
assert self.step in ['preprocess', 'features_selection'], 'apply preprocess method'
if verbose:
start_time = time()
print_title1('Train predict')
# Train/Test split
df_train, df_test = train_test(self, 0.2)
# Create Hyperopt object
hyperopt = HyperOpt(classifier=clf, grid_param=grid_param, n_param_comb=n_comb,
bagging=top_bagging, comb_seed=comb_seed)
# fit model on train set
if verbose:
color_print('training models')
hyperopt.fit(df_train, self.target, verbose=verbose)
# Apply model on test set
if verbose:
color_print('\napplying models')
d_fitted_models = hyperopt.predict(df_test, self.target, delta_auc=delta_auc, verbose=verbose)
# model selection
if verbose:
color_print('\nbest model selection')
best_model_idx, l_valid_models = hyperopt.get_best_model(d_fitted_models, metric=metric, delta_auc_th=delta_auc,
verbose=False)
df_model_res = hyperopt.model_res_to_df(d_fitted_models, sort_metric=metric)
if best_model_idx is not None:
print_title1('best model : ' + str(best_model_idx))
print(metric + ' : ' + str(round(d_fitted_models[best_model_idx]['metrics'][metric], 4)))
print('AUC : ' + str(round(d_fitted_models[best_model_idx]['metrics']['Roc_auc'], 4)))
if round(d_fitted_models[best_model_idx]['metrics'][metric], 4) == 1.0:
color_print("C'était pas qu'un physique finalement hein ?", 32)
print('\n\t\t>>>', 'model_train_test execution time:', round(time() - start_time, 4), 'secs. <<<')
self.d_hyperopt = hyperopt
self.is_fitted_model = True
return d_fitted_models, l_valid_models, best_model_idx, df_model_res
def preprocess_apply(self, df, verbose=False):
"""Apply preprocessing.
Requires preprocess method to have been applied (so that all encoder are fitted).
Parameters
----------
df : DataFrame
dataset to apply preprocessing on
verbose : boolean (Default False)
Get logging information
Returns
-------
DataFrame : Preprocessed dataset
"""
if verbose:
start_time = time()
print_title1('Apply Preprocessing')
# check pipe step and is_fitted
assert self.is_fitted_preprocessing, "fit first (please)"
#
df_local = df.copy()
# Remove features with zero variance / verbatims and identifiers
if verbose:
color_print("Remove features (zero variance, verbatims and identifiers")
if len(self.d_preprocess['remove']) > 0:
df_local = df_local.drop(self.d_preprocess['remove'], axis=1)
if verbose:
print(" >", len(self.d_preprocess['remove']), 'removed features')
else:
if verbose:
print(" > No features to remove")
# Transform date -> time between date and date_ref
if verbose:
color_print("Transform date")
df_local = self.d_preprocess['date'].transform(df_local, verbose=verbose)
# Missing Values
if verbose:
color_print('Missing values')
df_local = self.d_preprocess['NA'].transform(df_local, verbose=verbose)
# replace outliers
if 'outlier' in list(self.d_preprocess.keys()):
if verbose:
color_print('Outliers')
df_local = self.d_preprocess['outlier'].transform(df_local, verbose=verbose)
# categorical processing
if verbose:
color_print('Encode categorical and boolean')
print('\n\t\t>>>', 'preprocess_apply execution time:', round(time() - start_time, 4), 'secs. <<<')
df_local = self.d_preprocess['categorical'].transform(df_local, verbose=verbose)
return df_local
def preprocess(self, date_ref=None, process_outliers=False,
cat_method='deep_encoder', verbose=False):
"""Prepare the data before feeding it to the model :
- remove low variance features
- remove identifiers and verbatims features
- transform date features to timedelta
- fill missing values
- process categorical and boolean data (one-hot-encoding or Pytorch NN encoder)
- replace outliers (optional)
create self.d_preprocess : dict {step : transformation}
- remove: list of the features to remove
- date: fitted DateEncoder object
- NA: fitted NAEncoder object
- categorical: fitted CategoricalEncoder object
- outlier: fitted OutlierEncoder object
Parameters
----------
date_ref : string '%d/%m/%y' (Default : None)
ref date to compute date features timedelta.
If None, today date
process_outliers : boolean (Default : False)
Enable outliers replacement
cat_method : string (Default : 'deep_encoder')
Categorical features encoding method
verbose : boolean (Default False)
Get logging information
"""
# check pipe step
assert self.step in ['explore'], 'apply explore method first'
assert not self.is_fitted_preprocessing, 'preprocessing encoders already fitted'
###############################
# Fit and apply preprocessing #
###############################
if verbose:
start_time = time()
print_title1('Fit and apply preprocessing')
target = self.target
df_local = self.copy()
# Features Removing 'zero variance / verbatims / identifiers)
if verbose:
color_print("Features removing (zero variance / verbatims / identifiers)")
l_remove = self.d_features['low_variance'] + self.d_features['verbatim'] + self.d_features['identifier']
if len(l_remove) > 0:
df_local = df_local.drop(l_remove, axis=1)
if verbose:
print(" >", len(l_remove), "features to remove")
if len(l_remove) > 0:
print(" ", l_remove)
# Transform date -> time between date and date_ref
if verbose:
color_print("Transform date")
date_encoder = DateEncoder(method='timedelta', date_ref=date_ref)
date_encoder.fit(self, l_var=self.d_features['date'], verbose=False)
df_local = date_encoder.transform(df_local, verbose=verbose)
# Missing Values
if verbose:
color_print('Missing values')
NA_encoder = NAEncoder()
NA_encoder.fit(df_local, l_var=None, verbose=False)
df_local = NA_encoder.transform(df_local, verbose=verbose)
# replace outliers
if process_outliers:
if verbose:
color_print('Outliers')
out_encoder = OutliersEncoder()
out_encoder.fit(df_local, l_var=None, verbose=False)
df_local = out_encoder.transform(df_local, verbose=verbose)
else:
out_encoder = None
# categorical processing
if verbose:
color_print('Encode Categorical and boolean')
cat_col = self.d_features['categorical'] + self.d_features['boolean']
# apply one-hot encoding if target not filled in class parameters
if self.target is None:
cat_method = 'one_hot'
color_print('No target -> one_hot encoding !', 31)
# get embedding
cat_encoder = CategoricalEncoder(method=cat_method)
cat_encoder.fit(self, l_var=cat_col, target=self.target, verbose=verbose)
df_local = cat_encoder.transform(df_local, verbose=verbose)
# store preprocessing params
self.d_preprocess = {'remove': l_remove, 'date': date_encoder, 'NA': NA_encoder, 'categorical': cat_encoder}
if out_encoder is not None:
self.d_preprocess['outlier'] = out_encoder
if verbose:
color_print("\nCreated attributes : d_preprocess (dict) ")
print("Keys :")
print(" -> remove")
print(" -> date")
print(" -> NA")
print(" -> categorical")
print(" -> outlier (optional)")
# is_fitted
self.is_fitted_preprocessing = True
# update self
self.__dict__.update(df_local.__dict__)
self.target = target
self.step = 'preprocess'
if verbose:
color_print("New DataFrame size ")
print(" > row number : ", self.shape[0], "\n > col number : ", self.shape[1])
print('\n\t\t>>>', 'proprocess execution time:', round(time() - start_time, 4), 'secs. <<<')