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Train just on qi (#15)
* QI updates * update code to support training ML on QI features * fix code so features that are not from QI should not be part of generalizations and add description * merging two branches, training on QI and on all data * adding tests and asserts
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4 changed files with 373 additions and 135 deletions
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@ -47,17 +47,22 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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features : list of str, optional
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The feature names, in the order that they appear in the data.
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categorical_features: list of str, optional
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The list of categorical features should only be supplied when
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passing data as a pandas dataframe.
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features_to_minimize: List of str or numbers, optional
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The features that need to be minimized in case of pandas data,
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and indexes of features in case of numpy data.
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cells : list of object, optional
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The cells used to generalize records. Each cell must define a
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range or subset of categories for each feature, as well as a
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representative value for each feature.
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This parameter should be used when instantiating a transformer
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object without first fitting it.
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train_only_QI : Bool, optional
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The required method to train data set for minimizing. Default is
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to train the tree just on the features that are given as
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features_to_minimize.
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Attributes
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----------
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@ -78,7 +83,8 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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"""
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def __init__(self, estimator=None, target_accuracy=0.998, features=None,
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cells=None, categorical_features=None):
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cells=None, categorical_features=None, features_to_minimize: Union[np.ndarray, list] = None
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, train_only_QI=True):
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self.estimator = estimator
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self.target_accuracy = target_accuracy
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self.features = features
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@ -86,8 +92,9 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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self.categorical_features = []
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if categorical_features:
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self.categorical_features = categorical_features
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self.is_numpy = True
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self.features_to_minimize = features_to_minimize
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self.train_only_QI = train_only_QI
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def get_params(self, deep=True):
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"""Get parameters for this estimator.
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@ -201,17 +208,33 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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self.cells_ = {}
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self.categorical_values = {}
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if self.is_numpy:
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X = pd.DataFrame(X, columns=self._features)
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# Going to fit
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# (currently not dealing with option to fit with only X and y and no estimator)
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if self.estimator and X is not None and y is not None:
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if self.is_numpy:
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if not self.features_to_minimize:
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self.features_to_minimize = [i for i in range(len(self._features))]
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x_QI = X[:, self.features_to_minimize]
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self.features_to_minimize = [self._features[i] for i in self.features_to_minimize]
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X = pd.DataFrame(X, columns=self._features)
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else:
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if not self.features_to_minimize:
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self.features_to_minimize = self._features
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x_QI = X.loc[:, self.features_to_minimize]
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x_QI = pd.DataFrame(x_QI, columns=self.features_to_minimize)
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# divide dataset into train and test
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used_data = X
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if self.train_only_QI:
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used_data = x_QI
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X_train, X_test, y_train, y_test = train_test_split(X, y, stratify=y,
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test_size=0.4,
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random_state=18)
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X_train_QI = X_train.loc[:, self.features_to_minimize]
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X_test_QI = X_test.loc[:, self.features_to_minimize]
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used_X_train = X_train
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if self.train_only_QI:
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used_X_train = X_train_QI
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# collect feature data (such as min, max)
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@ -229,42 +252,71 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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feature_data[feature] = fd
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# prepare data for DT
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categorical_features = list(self.categorical_features)
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categorical_features = [f for f in self._features if f in self.categorical_features and
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f in self.features_to_minimize]
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numeric_transformer = Pipeline(
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steps=[('imputer', SimpleImputer(strategy='constant', fill_value=0))]
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)
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# numeric_features = list(self._features) - list(self.categorical_features)
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numeric_features = [item for item in self._features if item not in self.categorical_features]
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numeric_features = [f for f in self._features if f not in self.categorical_features and
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f in self.features_to_minimize]
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categorical_transformer = OneHotEncoder(handle_unknown="ignore", sparse=False)
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preprocessor = ColumnTransformer(
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preprocessor_QI_features = ColumnTransformer(
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transformers=[
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("num", numeric_transformer, numeric_features),
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("cat", categorical_transformer, categorical_features),
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]
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)
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preprocessor.fit(X)
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preprocessor_QI_features.fit(x_QI)
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# preprocessor to fit data that have features not included in QI (to get accuracy)
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numeric_features = [f for f in self._features if f not in self.categorical_features]
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numeric_transformer = Pipeline(
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steps=[('imputer', SimpleImputer(strategy='constant', fill_value=0))]
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)
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categorical_transformer = OneHotEncoder(handle_unknown="ignore", sparse=False)
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preprocessor = ColumnTransformer(
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transformers=[
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("num", numeric_transformer, numeric_features),
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("cat", categorical_transformer, self.categorical_features),
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]
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)
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preprocessor.fit(X)
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x_prepared = preprocessor.transform(X_train)
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self.preprocessor = preprocessor
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if self.train_only_QI:
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x_prepared = preprocessor_QI_features.transform(X_train_QI)
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self._preprocessor = preprocessor
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self.cells_ = {}
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self.dt_ = DecisionTreeClassifier(random_state=0, min_samples_split=2,
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min_samples_leaf=1)
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self.dt_.fit(x_prepared, y_train)
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self._modify_categorical_features(X)
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self._modify_categorical_features(used_data)
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x_prepared = pd.DataFrame(x_prepared, columns=self.categorical_data.columns)
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self._calculate_cells()
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self._modify_cells()
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# features that are not from QI should not be part of generalizations
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for feature in self._features:
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if feature not in self.features_to_minimize:
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self._remove_feature_from_cells(self.cells_, self.cells_by_id_, feature)
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nodes = self._get_nodes_level(0)
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self._attach_cells_representatives(x_prepared, X_train, y_train, nodes)
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self._attach_cells_representatives(x_prepared, used_X_train, y_train, nodes)
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# self.cells_ currently holds the generalization created from the tree leaves
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self._calculate_generalizations()
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# apply generalizations to test data
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x_prepared_test = preprocessor.transform(X_test)
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if self.train_only_QI:
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x_prepared_test = preprocessor_QI_features.transform(X_test_QI)
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x_prepared_test = pd.DataFrame(x_prepared_test, index=X_test.index, columns=self.categorical_data.columns)
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generalized = self._generalize(X_test, x_prepared_test, nodes, self.cells_, self.cells_by_id_)
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@ -285,8 +337,8 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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cells_by_id_prev = self.cells_by_id_
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nodes = self._get_nodes_level(level)
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self._calculate_level_cells(level)
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self._attach_cells_representatives(x_prepared, used_X_train, y_train, nodes)
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self._attach_cells_representatives(x_prepared, X_train, y_train, nodes)
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self._calculate_generalizations()
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generalized = self._generalize(X_test, x_prepared_test, nodes, self.cells_,
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self.cells_by_id_)
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@ -335,7 +387,6 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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X : {array-like, sparse-matrix}, shape (n_samples, n_features), If provided as a pandas dataframe,
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may contain both numeric and categorical data.
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The input samples.
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Returns
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-------
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X_transformed : numpy or pandas according to the input type, shape (n_samples, n_features)
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@ -357,7 +408,6 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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else:
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self.is_numpy = False
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if X.shape[1] != self.n_features_ and self.n_features_ != 0:
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raise ValueError('Shape of input is different from what was seen'
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'in `fit`')
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@ -428,19 +478,24 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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self.categorical_values = {}
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self.oneHotVectorFeaturesToFeatures = {}
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features_to_remove = []
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used_features = self._features
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if self.train_only_QI:
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used_features = self.features_to_minimize
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for feature in self.categorical_features:
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try:
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all_values = X.loc[:, feature]
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values = list(all_values.unique())
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self.categorical_values[feature] = values
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X[feature] = pd.Categorical(X.loc[:, feature], categories=values, ordered=False)
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ohe = pd.get_dummies(X[feature], prefix=feature)
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for oneHotVectorFeature in ohe.columns:
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self.oneHotVectorFeaturesToFeatures[oneHotVectorFeature] = feature
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X = pd.concat([X, ohe], axis=1)
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features_to_remove.append(feature)
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except KeyError:
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print("feature " + feature + "not found in training data")
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if feature in used_features:
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try:
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all_values = X.loc[:, feature]
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values = list(all_values.unique())
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self.categorical_values[feature] = values
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X[feature] = pd.Categorical(X.loc[:, feature], categories=values, ordered=False)
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ohe = pd.get_dummies(X[feature], prefix=feature)
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for oneHotVectorFeature in ohe.columns:
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self.oneHotVectorFeaturesToFeatures[oneHotVectorFeature] = feature
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X = pd.concat([X, ohe], axis=1)
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features_to_remove.append(feature)
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except KeyError:
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print("feature " + feature + "not found in training data")
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self.categorical_data = X.drop(features_to_remove, axis=1)
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def _cell_contains_numeric(self, f, range, x):
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@ -556,7 +611,7 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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right_child = self.dt_.tree_.children_right[node]
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left_cell = self.cells_by_id_[left_child]
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right_cell = self.cells_by_id_[right_child]
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new_cell = {'id': int(node), 'ranges': {}, 'categories': {},
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new_cell = {'id': int(node), 'ranges': {}, 'categories': {}, 'untouched': [],
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'label': None, 'representative': None}
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for feature in left_cell['ranges'].keys():
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new_cell['ranges'][feature] = {}
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@ -566,6 +621,9 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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new_cell['categories'][feature] = \
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list(set(left_cell['categories'][feature]) |
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set(right_cell['categories'][feature]))
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for feature in left_cell['untouched']:
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if feature in right_cell['untouched']:
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new_cell['untouched'].append(feature)
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self._calculate_level_cell_label(left_cell, right_cell, new_cell)
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new_cells.append(new_cell)
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new_cells_by_id[new_cell['id']] = new_cell
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@ -675,7 +733,6 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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else:
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replace = representatives.loc[i].to_frame().T.reset_index(drop=True)
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replace.index = indexes
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# replace = self.preprocessor.transform(replace)
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replace = pd.DataFrame(replace, indexes, columns=self._features)
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original_data_generalized.loc[indexes, representatives.columns.tolist()] = replace
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@ -701,8 +758,6 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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if feature is None:
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return None
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GeneralizeToRepresentative._remove_feature_from_cells(self.cells_, self.cells_by_id_, feature)
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# del self.generalizations_['ranges'][feature]
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# self.generalizations_['untouched'].append(feature)
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return feature
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def _get_feature_to_remove(self, original_data, prepared_data, nodes, labels, feature_data, current_accuracy):
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@ -730,7 +785,7 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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cells_by_id = copy.deepcopy(self.cells_by_id_)
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GeneralizeToRepresentative._remove_feature_from_cells(new_cells, cells_by_id, feature)
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generalized = self._generalize(original_data, prepared_data, nodes, new_cells, cells_by_id)
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accuracy_gain = self.estimator.score(self.preprocessor.transform(generalized),
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accuracy_gain = self.estimator.score(self._preprocessor.transform(generalized),
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labels) - current_accuracy
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if accuracy_gain < 0:
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accuracy_gain = 0
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@ -753,7 +808,7 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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cells_by_id = copy.deepcopy(self.cells_by_id_)
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GeneralizeToRepresentative._remove_feature_from_cells(new_cells, cells_by_id, feature)
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generalized = self._generalize(original_data, prepared_data, nodes, new_cells, cells_by_id)
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accuracy_gain = self.estimator.score(self.preprocessor.transform(generalized),
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accuracy_gain = self.estimator.score(self._preprocessor.transform(generalized),
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labels) - current_accuracy
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if accuracy_gain < 0:
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@ -923,7 +978,7 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
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cell['untouched'] = []
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if feature in cell['ranges'].keys():
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del cell['ranges'][feature]
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else:
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elif feature in cell['categories'].keys():
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del cell['categories'][feature]
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cell['untouched'].append(feature)
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cells_by_id[cell['id']] = cell.copy()
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