def select_features_without_label(features: pd.DataFrame, missing_threshold=0.7,
correlation_threshold=0.95) -> pd.DataFrame:
fs = FeatureSelector(data=features)
fs.identify_missing(missing_threshold)
fs.identify_single_unique()
# fs.identify_collinear(correlation_threshold)
return fs.remove(methods=['missing', 'single_unique'])
def select_features_without_label(features: pd.DataFrame,
missing_threshold=0.90,
correlation_threshold=1) -> pd.DataFrame:
print(missing_threshold)
fs = FeatureSelector(data=features)
fs.identify_missing(missing_threshold)
fs.identify_single_unique()
if correlation_threshold < 1:
fs.identify_collinear(correlation_threshold)
return fs.remove(methods=['missing', 'single_unique', "collinear"])
else:
return fs.remove(methods=['missing', 'single_unique'])
def featureselect(datas, target):
import os
os.chdir('c:\\Users\\SA\\python\\練習py')
from feature_selector import FeatureSelector
fs = FeatureSelector(data=datas, labels=target)
fs.identify_missing(missing_threshold=0.6)
fs.identify_collinear(correlation_threshold=0.9)
fs.identify_zero_importance(task='classification',
eval_metric='auc',
n_iterations=10,
early_stopping=False)
fs.identify_low_importance(cumulative_importance=0.9)
train_removed = fs.remove(methods='all')
return train_removed
def runFeatureSelector(self, df):
logging.info(("Running Feature Selection"))
fs = FeatureSelector(data=df, labels=self.targets)
# Identify Missing Values
fs.identify_missing(missing_threshold=0.6)
# Identify Collinearity
fs.identify_collinear(correlation_threshold=0.98)
fs.record_collinear.to_csv(".\\utils\\csv\\record_collinear.csv")
# Identify Single Unique
fs.identify_single_unique()
fs.record_single_unique.to_csv(
".\\utils\\csv\\record_single_unique.csv")
# Zero importance
fs.identify_zero_importance(task='classification',
eval_metric='multi_logloss',
n_iterations=10,
early_stopping=True)
fs.record_zero_importance.to_csv(
".\\utils\\csv\\record_zero_importance.csv")
# Low Importance
fs.identify_low_importance(cumulative_importance=0.99)
fs.feature_importances.to_csv(".\\utils\\csv\\feature_importance.csv")
#generate summary of all operations
summary = pd.DataFrame.from_dict(fs.ops, orient='index')
summary.to_csv(".\\utils\\csv\\summary.csv")
#if drop flag is 1, go ahead and remove the suggested features
if self.drop == 1:
df = fs.remove(methods='all')
else:
pass
return df
def remove_unnecessary_features(self, auto=False):
if auto:
self.processed_data = self.processed_data.drop(
columns=self.predefined_skip_features)
else:
fs = FeatureSelector(data=self.processed_data.drop("label",
axis=1),
labels=self.processed_data["label"])
fs.identify_missing(missing_threshold=0.6)
fs.identify_collinear(correlation_threshold=0.98)
fs.identify_zero_importance(task='classification',
eval_metric='auc',
n_iterations=10,
early_stopping=False)
fs.identify_low_importance(cumulative_importance=0.99)
fs.identify_single_unique()
# Remove the features from all methods (returns a df)
labels = self.processed_data["label"]
self.processed_data = fs.remove(methods='all')
self.processed_data["label"] = labels
#-- Create an instance
fs = FeatureSelector(data = df_feats, labels = train_labels)
#-- Identify redundant features
if(USE_LEARNER_FOR_FEATURE_SELECTION):
# NOT COMPLETE
fs.identify_all(selection_params = {'missing_threshold': 0.6, 'correlation_threshold': 0.98,
'task': 'classification', 'eval_metric': 'auc',
'cumulative_importance': 0.99})
#-- Get valuable features
X = fs.remove(methods = 'all', keep_one_hot = True)
else:
#-- Features with missing values greater than threshold
fs.identify_missing(missing_threshold = MISSING_VALUE_THRESHOLD)
#-- Correlated features
fs.identify_collinear(correlation_threshold = CORRELATION_THRESHOLD)
#-- Single unique value
fs.identify_single_unique()
#-- TO get keys fs.ops.keys()
missing_features = list(fs.ops['missing'])
corelated_features = list(fs.ops['collinear'])
single_value = list(fs.ops['single_unique'])
r = set(flatten([missing_features,corelated_features,single_value]))
#X = df_feats.drop(r, axis=1)
#pd.head，默认查看前五行数据。因为train已经是pd因此直接.head即可
print(train.head())
#pandas.drop的用法，删除Target列
train = train.drop(['TARGET'], axis=1)
#对于pandas，行标为index，列表为columns
#如常用df = pd.DataFrame(np.random.randn(5,3),index = list('abcde'),columns = ['one','two','three'])
#Create the Instance
fs = FeatureSelector(data=train, labels=train_labels)
# 1 Missing Values
fs.identify_missing(missing_threshold=0.6)
#The features identified for removal can be accessed through the ops dictionary of the FeatureSelector object.
missing_features = fs.ops['missing']
print(missing_features[:20])
fs.plot_missing() #在每一个画图的后面加上plt.show即可
plt.show()
print(fs.missing_stats.head(20))
# 2 Single Unique Value
fs.identify_single_unique()
single_unique = fs.ops['single_unique']
print(single_unique)
test = pd.read_csv(path0 + 'test.csv')
train = pd.read_csv(path0 + 'train.csv')
print('tag_value_counts', train['Tag'].value_counts())
train_labels = train['Tag']
train = train.drop(['UID', 'Tag'], axis=1)
X_loc_test = test.drop('UID', axis=1)
from feature_selector import FeatureSelector
# Features are in train and labels are in train_labels
fs = FeatureSelector(data=train, labels=train_labels)
#缺失值统计
fs.identify_missing(0.5)
df_miss_value = fs.missing_stats.sort_values('missing_fraction',
ascending=False)
print('df_miss_value', df_miss_value.head(15))
missing_features = fs.ops['missing']
print('missing_features to remove', missing_features[:20])
#单值特征统计
fs.identify_single_unique()
print('fs.plot_unique()', fs.plot_unique())
fs.identify_collinear(0.95)
print('plot_collinear()', fs.plot_collinear())
# list of collinear features to remove
collinear_features = fs.ops['collinear']
# Evaluate the K-Means clustering results
data_new2["Is_Male"] = y_pred_kmeans
test = data_new2[important_features]
test["Is_Male"] = y_pred_kmeans
#Building ANN now
data_ANN = data.copy()
data_ANN["Is_Male"] = y_pred_kmeans
data_ANN.drop(columns="customer_id", inplace=True)
X = data_ANN.iloc[:, :42]
y = data_ANN.iloc[:, 42]
#Step 1 - Feature selection
from feature_selector import FeatureSelector
fts = FeatureSelector(X, y)
fts.identify_missing(missing_threshold=0.9)
fts.identify_collinear(correlation_threshold=0.7)
fts.plot_collinear()
collinear_features = fts.ops['collinear']
fts.identify_zero_importance(task='classification',
eval_metric='auc',
n_iterations=30,
early_stopping=True)
zero_importance_features = fts.ops['zero_importance']
fts.plot_feature_importances(threshold=0.99, plot_n=12)
Most_important_Features = list(fts.feature_importances["feature"].head(28))
Data_ANN_2 = data_ANN[Most_important_Features]
# In[7]:
from feature_selector import FeatureSelector
# In[8]:
data = pd.DataFrame(data_np)
# In[27]:
fc = FeatureSelector(data, labels=label)
# In[10]:
fc.identify_missing(missing_threshold=0.95)
# In[11]:
fc.missing_stats.head()
# In[12]:
fc.identify_collinear(correlation_threshold=0.98)
# In[17]:
fc.identify_zero_importance(task='classification',
eval_metric='auc',
n_iterations=10,
early_stopping=True)
