def __init__(self,
idx_original,
base_estimator,
performance_evaluator,
created_on,
disable_background_learner,
disable_drift_detector,
drift_detection_method,
warning_detection_method,
drift_detection_criteria,
is_background_learner,
feature_indexes=None,
nominal_attributes=None,
random_state=None):
super().__init__(idx_original=idx_original,
base_estimator=base_estimator,
performance_evaluator=performance_evaluator,
created_on=created_on,
disable_background_learner=disable_background_learner,
disable_drift_detector=disable_drift_detector,
drift_detection_method=drift_detection_method,
warning_detection_method=warning_detection_method,
drift_detection_criteria=drift_detection_criteria,
is_background_learner=is_background_learner,
feature_indexes=feature_indexes,
nominal_attributes=nominal_attributes)
# Background learner
self._background_learner: StreamingRandomPatchesRegressorBaseLearner = None
self._background_learner_class = StreamingRandomPatchesRegressorBaseLearner
# Rest only applies when using periodic pseudo drift detectors
# Use the same random_state object of the meta learner
self.random_state = random_state
self._random_state = check_random_state(self.random_state)
# Drift detection
self.drift_detection_criteria = drift_detection_criteria
# If the drift detection method is periodic-fixed,
# then set the shift option based on the instance index
if isinstance(self.drift_detection_method, PeriodicTrigger):
if self.drift_detection_method.trigger_method == PeriodicTrigger._FIXED_TRIGGER:
self.drift_detection_method.set_params(w=self.idx_original)
if self.drift_detection_method.trigger_method == PeriodicTrigger._RANDOM_TRIGGER:
self.drift_detection_method.set_params(random_state=
check_random_state(self.random_state))
if isinstance(self.warning_detection_method, PeriodicTrigger):
if self.warning_detection_method.trigger_method == PeriodicTrigger._FIXED_TRIGGER:
self.warning_detection_method.set_params(w=self.idx_original)
if self.warning_detection_method.trigger_method == PeriodicTrigger._RANDOM_TRIGGER:
self.warning_detection_method.set_params(random_state=
check_random_state(self.random_state))
# Only used when paired with periodic drift detectors
self.disable_warning_detector = False
def test_check_random_state():
rand = None
rand = check_random_state(rand)
assert isinstance(rand, np.random.mtrand.RandomState)
rand = check_random_state(rand)
assert isinstance(rand, np.random.mtrand.RandomState)
rand = check_random_state(int(1))
assert isinstance(rand, np.random.mtrand.RandomState)
with pytest.raises(ValueError):
check_random_state(2.0)
def prepare_for_use(self):
"""
Prepares the stream for use.
Notes
-----
This functions should always be called after the stream initialization.
"""
self._random_state = check_random_state(self.random_state)
self._next_class_should_be_zero = False
self.sample_idx = 0
for i in range(self.n_features):
self._weights[i] = self._random_state.rand()
self._sigma[i] = 1 if (i < self.n_drift_features) else 0
self.n_redund_features = math.floor(
(self.n_features * self.perc_redund_features))
self.n_not_redund_features = self.n_features - self.n_redund_features
# Initialise variable for redundancy
self.index_redund = [
self._sample_random_state.randint(
0, (self.n_features - self.n_redund_features - 1))
for ind in range(self.n_redund_features)
]
self.coef_redund = [
self._random_state.rand() + 0.1
for ind in range(self.n_redund_features)
]
def __init__(self, split_test, stats=None, random_state=None):
super().__init__(split_test, stats)
self._adwin = ADWIN()
self._alternate_tree = None
self.error_change = False
self._random_state = check_random_state(random_state)
def partial_fit(self, X, y, classes=None, sample_weight=None):
""" Partially (incrementally) fit the model.
Parameters
----------
X : numpy.ndarray of shape (n_samples, n_features)
The features to train the model.
y: numpy.ndarray of shape (n_samples)
An array-like with the class labels of all samples in X.
classes: None
Not used by this method.
sample_weight: None
Not used by this method.
Returns
-------
self
"""
row_cnt, _ = X.shape
if self.samples_seen == 0:
self._random_state = check_random_state(self.random_state)
self.build_trees()
for i in range(row_cnt):
self._partial_fit(X[i], y[i])
return self
def reset(self):
"""Reset ARF."""
self.ensemble = None
self.max_features = 0
self.instances_seen = 0
self._train_weight_seen_by_model = 0.0
self.random_state = check_random_state(self._init_random_state)
def generate_random_tree(self):
""" generate_random_tree
Generates the random tree, starting from the root node and following
the constraints passed as parameters to the initializer.
The tree is recursively generated, node by node, until it reaches the
maximum tree depth.
"""
# Starting random generators and parameter arrays
tree_random_state = check_random_state(self.tree_random_state)
nominal_att_candidates = array('i')
min_numeric_value = array('d')
max_numeric_value = array('d')
for i in range(self.n_num_features):
min_numeric_value.append(0.0)
max_numeric_value.append(1.0)
for i in range(self.n_num_features + self.n_cat_features):
nominal_att_candidates.append(i)
self.tree_root = self.generate_random_tree_node(
0, nominal_att_candidates, min_numeric_value, max_numeric_value,
tree_random_state)
def _generate_centroids(self):
""" Generates centroids
The centroids are generated just as it's done in the parent class,
the difference is the extra step taken to setup the drift, if there's
any.
To configure the drift, random offset speeds are chosen for
``self.num_drift_centroids`` centroids. Finally, the speed is
normalized.
"""
super()._generate_centroids()
model_random_state = check_random_state(self.model_random_state)
num_drift_centroids = self.num_drift_centroids
self.centroid_speed = []
if num_drift_centroids > self.n_centroids:
num_drift_centroids = self.n_centroids
for i in range(num_drift_centroids):
rand_speed = []
norm_speed = 0.0
for j in range(self.n_num_features):
rand_speed.append(model_random_state.rand())
norm_speed += rand_speed[j] * rand_speed[j]
norm_speed = np.sqrt(norm_speed)
for j in range(self.n_num_features):
rand_speed[j] /= norm_speed
self.centroid_speed.append(rand_speed)
def __init__(self,
max_byte_size=33554432,
memory_estimate_period=2000000,
grace_period=50,
split_criterion='info_gain',
split_confidence=0.01,
tie_threshold=0.05,
binary_split=False,
stop_mem_management=False,
remove_poor_atts=False,
no_preprune=False,
leaf_prediction='nba',
nb_threshold=0,
nominal_attributes=None,
max_features=2,
random_state=None):
"""ARFHoeffdingTreeClassifier class constructor."""
super().__init__(max_byte_size=max_byte_size,
memory_estimate_period=memory_estimate_period,
grace_period=grace_period,
split_criterion=split_criterion,
split_confidence=split_confidence,
tie_threshold=tie_threshold,
binary_split=binary_split,
stop_mem_management=stop_mem_management,
remove_poor_atts=remove_poor_atts,
no_preprune=no_preprune,
leaf_prediction=leaf_prediction,
nb_threshold=nb_threshold,
nominal_attributes=nominal_attributes)
self.max_features = max_features
self.remove_poor_attributes = False
self.random_state = random_state
self._random_state = check_random_state(self.random_state)
def __init__(self, initial_stats=None, max_features=2, random_state=None):
""" LearningNodeNB class constructor. """
super().__init__(initial_stats)
self.max_features = max_features
self.feature_indices = np.array([])
self.random_state = random_state
self._random_state = check_random_state(self.random_state)
def __init__(self, split_test, class_observations):
super().__init__(split_test, class_observations)
self._estimation_error_weight = ADWIN()
self._alternate_tree = None
self.error_change = False
self._random_seed = 1
self._classifier_random = check_random_state(self._random_seed)
def __init__(self, initial_class_observations, max_features, random_state=None):
""" ActiveLearningNodeForRegression class constructor. """
super().__init__(initial_class_observations)
self.max_features = max_features
self.list_attributes = np.array([])
self.random_state = check_random_state(random_state)
def prepare_for_use(self):
"""
Should be called before generating the samples.
"""
self.random_state = check_random_state(self._original_random_state)
self.sample_idx = 0
def __init__(self,
max_byte_size=33554432,
memory_estimate_period=2000000,
grace_period=50,
split_confidence=0.01,
tie_threshold=0.05,
binary_split=False,
stop_mem_management=False,
remove_poor_atts=False,
leaf_prediction="perceptron",
no_preprune=False,
nominal_attributes=None,
learning_ratio_perceptron=0.02,
learning_ratio_decay=0.001,
learning_ratio_const=True,
max_features=2,
random_state=None):
super().__init__(max_byte_size=max_byte_size,
memory_estimate_period=memory_estimate_period,
grace_period=grace_period,
split_confidence=split_confidence,
tie_threshold=tie_threshold,
binary_split=binary_split,
stop_mem_management=stop_mem_management,
remove_poor_atts=remove_poor_atts,
leaf_prediction=leaf_prediction,
no_preprune=no_preprune,
nominal_attributes=nominal_attributes,
learning_ratio_perceptron=learning_ratio_perceptron,
learning_ratio_decay=learning_ratio_decay,
learning_ratio_const=learning_ratio_const)
self.max_features = max_features
self.random_state = random_state
self._random_state = check_random_state(self.random_state)
def partial_fit(self, X, y=None, classes=None, sample_weight=None):
""" Partially (incrementally) fit the model.
Parameters
----------
X : numpy.ndarray of shape (n_samples, n_features)
The features to train the model.
y: Not used
Kept in the signature for compatibility with parent class.
classes: None
Not used by this method.
sample_weight: None
Not used by this method.
Returns
-------
self
"""
row_cnt, _ = X.shape
if self.samples_seen == 0:
self._random_state = check_random_state(self.random_state)
self.n_features = get_dimensions(X)[1]
self.build_trees()
for i in range(row_cnt):
self._partial_fit(X[i])
return self
def _prepare_for_use(self):
self._random_state = check_random_state(self.random_state)
self.y = np.zeros(self.n_samples)
self.X = np.column_stack(
[np.sin(np.arange(self.n_samples) / 4.)
+ self._random_state.randn(self.n_samples) * self.noise,
np.cos(np.arange(self.n_samples) / 4.)
+ self._random_state.randn(self.n_samples) * self.noise]
)
if self.contextual:
# contextual anomaly indices
contextual_anomalies = self._random_state.choice(self.n_samples - self.shift,
self.n_contextual,
replace=self.replace)
# set contextual anomalies
contextual_idx = contextual_anomalies + self.shift
contextual_idx[contextual_idx >= self.n_samples] -= self.n_samples
self.X[contextual_idx, 1] = self.X[contextual_anomalies, 0]
# Anomaly indices
anomalies_idx = self._random_state.choice(self.n_samples, self.n_anomalies,
replace=self.replace)
self.X[anomalies_idx, 1] = np.sin(self._random_state.choice(self.n_anomalies,
replace=self.replace)) \
+ self._random_state.randn(self.n_anomalies) * self.noise + 2.
# Mark sample as anomalous
self.y[anomalies_idx] = 1
def __init__(self,
generator='agrawal',
stable_period=3000,
position=3000,
concepts=[4, 0, 8],
width=1,
lam=1.0,
has_noise=False,
all_concepts=[4, 0, 8, 6, 2, 1, 3, 5, 7, 9],
concept_shift_step=-1,
concept_shift_sample_intervals=[200000, 250000, 300000],
stable_period_lam=-1,
stable_period_start=1000,
stable_period_base=200,
stable_period_logger=None,
drift_interval_distr="poisson",
random_state=0):
super().__init__()
self.streams = []
self.cur_stream = None
self.stream_idx = 0
self.drift_stream_idx = 0
self.sample_idx = 0
self.generator = generator
self.stable_period = stable_period
self.position = position
self.concepts = concepts
self.random_state = random_state
self._random_state = check_random_state(self.random_state)
self.width = width
self.lam = lam
self.concepts_probs = []
self.has_noise = has_noise
self.noises = [0.1, 0.2, 0.3, 0.4]
self.noise_probs = self.__get_poisson_probs(4, self.lam)
self.stable_period_lam = stable_period_lam
self.stable_period_start = stable_period_start
self.stable_period_base = stable_period_base
if drift_interval_distr == "poisson":
self.stable_period_probs = \
self.__get_poisson_probs(20, self.stable_period_lam)
elif drift_interval_distr == "uniform":
self.stable_period_probs = \
self.__get_uniform_probs(20)
self.stable_period_logger = stable_period_logger
print(f"stable_period_probs: {self.stable_period_probs}")
self.concept_shift_step = concept_shift_step
self.concept_shift_sample_intervals = concept_shift_sample_intervals
self.all_concepts = all_concepts
self.total_sample_idx = 0
def __init__(self,
initial_class_observations,
perceptron_weight=None,
random_state=None):
"""ActiveLearningNodePerceptronMultiTarget class constructor."""
super().__init__(initial_class_observations)
self.perceptron_weight = perceptron_weight
self.random_state = check_random_state(random_state)
def __configure(self, base_estimator):
base_estimator.reset()
self.base_estimator = base_estimator
self.n_estimators = self._init_n_estimators
self.ensemble = [
cp.deepcopy(base_estimator) for _ in range(self.n_estimators)
]
self.random_state = check_random_state(self._init_random_state)
def __init__(self, sample_size, n_trees, random_state):
self.sample_size = sample_size
self.n_trees = n_trees
self.depth = np.log2(sample_size)
self.trees = []
self.random_state = random_state
self._random_state = check_random_state(self.random_state)
self.is_learning_phase_on = True
def __configure(self):
self.random_state = check_random_state(self._original_random_state)
self.n_cat_features = self._TOTAL_ATTRIBUTES_INCLUDING_NOISE if self.has_noise else self._NUM_BASE_ATTRIBUTES
self.n_features = self.n_cat_features
self.feature_names = [
"att_num_" + str(i) for i in range(self.n_cat_features)
]
self.target_values = [i for i in range(self.n_classes)]
def prepare_for_use(self):
"""
Should be called before generating the samples.
"""
self.random_state = check_random_state(self._original_random_state)
self._next_class_should_be_zero = False
self.sample_idx = 0
def __init__(self,
initial_class_observations,
perceptron_weight=None,
random_state=None):
super().__init__(initial_class_observations)
self.perceptron_weight = perceptron_weight
self.random_state = check_random_state(random_state)
def __configure(self):
if hasattr(self.base_estimator, "reset"):
self.base_estimator.reset()
self.actual_n_estimators = self.n_estimators
self.ensemble = [
cp.deepcopy(self.base_estimator)
for _ in range(self.actual_n_estimators)
]
self._random_state = check_random_state(self.random_state)
def _prepare_for_use(self):
self._random_state = check_random_state(self.random_state)
self.X, self.y = make_regression(n_samples=self.n_samples,
n_features=self.n_features,
n_informative=self.n_informative,
n_targets=self.n_targets,
random_state=self._random_state)
self.y = np.resize(self.y, (self.y.size, self.n_targets))
self.target_values = [float] * self.n_targets
def __init__(self,
initial_class_observations,
perceptron_weight=None,
random_state=None):
""" InactiveLearningNodeForRegression class constructor."""
super().__init__(initial_class_observations)
self.perceptron_weight = perceptron_weight
self.random_state = check_random_state(random_state)
def reset(self):
"""Reset ARFR."""
# TODO: check whether this is enough
self.ensemble = None
self.max_features = 0
self.instances_seen = 0
self._random_state = check_random_state(self.random_state)
def __configure(self, base_estimator):
self.n_estimators = self._init_n_estimators
self.adwin_ensemble = []
for i in range(self.n_estimators):
self.adwin_ensemble.append(ADWIN())
base_estimator.reset()
self.base_estimator = base_estimator
self.ensemble = [cp.deepcopy(base_estimator) for _ in range(self.n_estimators)]
self.random_state = check_random_state(self._init_random_state)
def __configure(self):
if hasattr(self.base_estimator, "reset"):
self.base_estimator.reset()
self.actual_n_estimators = self.n_estimators
self.ensemble = [cp.deepcopy(self.base_estimator) for _ in range(self.actual_n_estimators)]
self.adwin_ensemble = [ADWIN(self.delta) for _ in range(self.actual_n_estimators)]
self._random_state = check_random_state(self.random_state)
self.n_detected_changes = 0
self.classes = None
self.init_matrix_codes = True
def __init__(self,
initial_class_observations,
perceptron_weight,
random_state=None):
super().__init__(initial_class_observations, perceptron_weight,
random_state)
self._estimation_error_weight = ADWIN()
self._error_change = False
self._randomSeed = 1
self._classifier_random = check_random_state(self._randomSeed)