DDM

class capymoa.drift.detectors.DDM

Bases: MOADriftDetector

Drift-Detection-Method (DDM) Drift Detector

Example:

>>> import numpy as np
>>> from capymoa.drift.detectors import DDM
>>> np.random.seed(0)
>>>
>>> detector = DDM()
>>>
>>> data_stream = np.random.randint(2, size=2000)
>>> for i in range(999, 2000):
...     data_stream[i] = np.random.randint(4, high=8)
>>>
>>> for i in range(2000):
...     detector.add_element(data_stream[i])
...     if detector.detected_change():
...         print('Change detected in data: ' + str(data_stream[i]) + ' - at index: ' + str(i))
Change detected in data: 4 - at index: 1005

Reference:

Gama, Joao, et al. “Learning with drift detection.” Advances in Artificial Intelligence–SBIA 2004: 17th Brazilian Symposium on Artificial Intelligence, Sao Luis, Maranhao, Brazil, September 29-Ocotber 1, 2004.

__init__(

min_n_instances: int = 30,

warning_level: float = 2.0,

out_control_level: float = 3.0,

CLI: str | None = None,

)

Parameters:

• moa_detector – The MOA detector object or class identifier.

• CLI – The command-line interface (CLI) configuration for the MOA drift detector, defaults to None

CLI_help()

add_element(element: float) → None

Update the drift detector with a new input value.

Parameters:

element – A value to update the drift detector with. Usually, this is the prediction error of a model.

detected_change() → bool

Is the detector currently detecting a concept drift?

detected_warning() → bool

Is the detector currently warning of an upcoming concept drift?

get_params() → Dict[str, Any]

Get the hyper-parameters of the drift detector.

reset(clean_history: bool = False) → None

Reset the drift detector.

Parameters:

clean_history – Whether to reset detection history, defaults to False