Learning process: first version

[predictops.git] / predictops / learn / preprocessing.py

diff --git a/predictops/learn/preprocessing.py b/predictops/learn/preprocessing.py
index 49d7ef89bc2b2644f34f2022c3ee53d9827db98f..51ecb4e162ff77b804a6a9e4790c4e9da34e1410 100644 (file)
--- a/predictops/learn/preprocessing.py
+++ b/predictops/learn/preprocessing.py
@@ -6,6 +6,7 @@ from logging import getLogger
 from logging.config import fileConfig
 from os import listdir
 from pathlib import Path
 from logging.config import fileConfig
 from os import listdir
 from pathlib import Path

+from sklearn import preprocessing

 
 import numpy as np
 import pandas as pd
 
 import numpy as np
 import pandas as pd


@@ -24,12 +25,12 @@ class Preprocessing:
      - NaN values are then filled with last known values.
     '''
 
      - NaN values are then filled with last known values.
     '''
 

-    def __init__(self, config_file = None, dict_features = None, features = None):
+    def __init__(self, config_file = None,
+                 dict_features = None, dict_target = None):

         '''
         Constructor that defines all needed attributes and collects features.
         '''
         '''
         Constructor that defines all needed attributes and collects features.
         '''

-        self._config = ConfigParser()
-        self._config.read(config_file)
+        self._config = config_file

 
         self._start = datetime.strptime(self._config['DATETIME']['start'],
                                         '%m/%d/%Y %H:%M:%S')
 
         self._start = datetime.strptime(self._config['DATETIME']['start'],
                                         '%m/%d/%Y %H:%M:%S')


@@ -38,26 +39,38 @@ class Preprocessing:
         self._timestep = timedelta(hours =
                                    self._config['DATETIME'].getfloat('hourStep'))
         self._dict_features = dict_features
         self._timestep = timedelta(hours =
                                    self._config['DATETIME'].getfloat('hourStep'))
         self._dict_features = dict_features

+        self._dict_target = dict_target
+

         self._full_dict = None
         self._dataframe = None
         self._datetimes = []
         self._full_dict = None
         self._dataframe = None
         self._datetimes = []

-        # If features are not provided to the constructor, then we collect
-        # any existing feature in the dictionary
-        if features != None:
-            self._features = features
-        else:
-            self._features = set(chain.from_iterable([tuple(u.keys())
+
+        self._features = set(chain.from_iterable([tuple(u.keys())

                                                       for u in [*dict_features.values()]]))
                                                       for u in [*dict_features.values()]]))

-        csv_files = Path.cwd() / 'config' / 'features'
-        self._features = {feat : None for feat in self._features}
-        for csv_file in listdir(csv_files):
-            with open(csv_files / csv_file, "r") as f:
-                reader = DictReader(f, delimiter=',')
-                for row in reader:
-                    if row['name'] in self._features:
-                        self._features[row['name']] = row['type']
-        print(self._features)
-        exit()
+
+        feature_files = Path.cwd() / 'config' / 'features'
+        self._features = {feat : {'numerical': False} for feat in self._features}
+        for feature_file in listdir(feature_files):
+            if feature_file.endswith('csv'):
+                with open(feature_files / feature_file , "r") as f:
+                    reader = DictReader(f, delimiter=',')
+                    typed_names = {row['name']: row['type'] for row in reader}
+                for feature in self._features:
+                    if feature.split('_')[0] in typed_names:
+                        self._features[feature]['type'] = int(typed_names[feature.split('_')[0]])
+            elif feature_file.endswith('cfg'):
+                config = ConfigParser()
+                config.read(feature_files / feature_file)
+                for section in config:
+                    if config.has_option(section, 'numerical'):
+                        self._features[section]['numerical'] = config[section].getboolean('numerical')
+
+        self._numerical_columns = [k for k in self._features if self._features[k]['type'] == 1
+                   or (self._features[k]['type'] == 3 and self._features[k]['numerical'])]
+
+        self._categorical_columns = [k for k in self._features if self._features[k]['type'] == 2
+                   or (self._features[k]['type'] == 3 and not self._features[k]['numerical'])]
+

 
 
     @property
 
 
     @property


@@ -127,6 +140,84 @@ class Preprocessing:
         return self._full_dict
 
 
         return self._full_dict
 
 

+    def _fill_nan(self):
+        '''
+        Fill NaN values, either by propagation or by interpolation (linear or splines)
+        '''
+        logger.info("Filling NaN numerical values in the feature dataframe")
+        # We interpolate (linearly or with splines) only numerical columns
+        # The interpolation
+        if self._config['PREPROCESSING']['fill_method'] == 'propagate':
+            self._dataframe[self._numerical_columns] =\
+                self._dataframe[self._numerical_columns].fillna(method='ffill')
+        elif self._config['PREPROCESSING']['fill_method'] == 'linear':
+            self._dataframe[self._numerical_columns] =\
+                self._dataframe[self._numerical_columns].interpolate()
+        elif self._config['PREPROCESSING']['fill_method'] == 'spline':
+            self._dataframe[self._numerical_columns] =\
+                self._dataframe[self._numerical_columns].interpolate(method='spline',
+                     order=self._config['PREPROCESSING'].getint('order'))
+
+        # For the categorical columns, NaN values are filled by duplicating
+        # the last known value (forward fill method)
+        logger.info("Filling NaN categorical values in the feature dataframe")
+        self._dataframe[self._categorical_columns] =\
+            self._dataframe[self._categorical_columns].fillna(method='ffill')
+
+        # Uncomment this line to fill NaN values at the beginning of the
+        # dataframe. This may not be a good idea, especially for features
+        # that are available only for recent years, e.g., air quality
+        #self._dataframe = self._dataframe.fillna(method='bfill')
+
+        # Dropping rows that are not related to our datetime window (start/
+        # step / end)
+        self._dataframe = self._dataframe.drop([k.to_pydatetime()
+                                               for k in self._dataframe.T
+                                               if k not in self._datetimes])
+
+
+    def _add_history(self):
+        '''
+        Integrating previous nb of interventions as features
+        '''
+        logger.info("Integrating previous nb of interventions as features")
+        nb_lines = self._config['HISTORY_KNOWLEDGE'].getint('nb_lines')
+        for k in range(1,nb_lines+1):
+            name = 'history_'+str(nb_lines-k+1)
+            self._dataframe[name] = [np.NaN]*k + list(self._dict_target.values())[:-k]
+            self._numerical_columns.append(name)
+        self._dataframe = self._dataframe[nb_lines:]
+
+
+
+    def _standardize(self):
+        '''
+        Normalizing numerical features
+        '''
+        logger.info("Standardizing numerical values in the feature dataframe")
+        # We operate only on numerical columns
+        self._dataframe[self._numerical_columns] =\
+            preprocessing.scale(self._dataframe[self._numerical_columns])
+
+
+
+    def _one_hot_encoding(self):
+        '''
+        Apply a one hot encoding for category features
+        '''
+        logger.info("One hot encoding for categorical feature")
+
+        # We store numerical columns
+        df_out = pd.DataFrame()
+        for col in  self._numerical_columns:
+            df_out[col] = self._dataframe[col]
+        # The one hot encoding
+        for col in self._categorical_columns:
+            pd1 = pd.get_dummies(self._dataframe[col],prefix=col)
+            for col1 in pd1.columns:
+                df_out[col1] = pd1[col1]
+        self._dataframe = df_out
+

 
     @property
     def dataframe(self):
 
     @property
     def dataframe(self):


@@ -137,24 +228,14 @@ class Preprocessing:
             logger.info("Creating feature dataframe from feature dictionary")
             self._dataframe = pd.DataFrame.from_dict(self.full_dict,
                                                      orient='index')
             logger.info("Creating feature dataframe from feature dictionary")
             self._dataframe = pd.DataFrame.from_dict(self.full_dict,
                                                      orient='index')

-            logger.info("Filling NaN values in the feature dataframe")
-
-            if self._config['PREPROCESSING']['fill_method'] == 'propagate':
-                self._dataframe = self._dataframe.fillna(method='ffill')
-            elif self._config['PREPROCESSING']['fill_method'] == 'linear':
-                self._dataframe = self._dataframe.interpolate()
-            elif self._config['PREPROCESSING']['fill_method'] == 'spline':
-                self._dataframe = self._dataframe.interpolate(method='spline',
-                                                              order=self._config['PREPROCESSING'].getint('order'))
-
-            # Uncomment this line to fill NaN values at the beginning of the
-            # dataframe. This may not be a good idea, especially for features
-            # that are available only for recent years, e.g., air quality
-            #self._dataframe = self._dataframe.fillna(method='bfill')
-
-            self._dataframe = self._dataframe.drop([k.to_pydatetime()
-                                                   for k in self._dataframe.T
-                                                   if k not in self._datetimes])
+            # Dealing with NaN values
+            self._fill_nan()
+            # Adding previous (historical) nb_interventions as features
+            self._add_history()
+            # Normalizing numerical values
+            self._standardize()
+            # Dealing with categorical features
+            self._one_hot_encoding()

         return self._dataframe
 
 
         return self._dataframe