dataeval.shift.DriftReconstruction¶

class dataeval.shift.DriftReconstruction(model, device=None, model_type='auto', use_gmm=None, p_val=None, config=None)¶

Reconstruction-based drift detector using autoencoders.

Detects drift by comparing reconstruction errors: if the model (trained on reference data) produces higher reconstruction errors on test data, the test distribution has likely shifted.

Uses a fit/predict lifecycle: construct with model and hyperparameters, call fit() with reference data (trains the model), then call predict() with test data. Use chunked() to create a chunked wrapper for time-series monitoring.

Supports two modes:

• Non-chunked (default): Computes mean reconstruction error for the test set and uses a z-test against the reference baseline.

• Chunked (via chunked()): Splits data into chunks, computes mean reconstruction error per chunk, and uses threshold bounds to flag drift.

Parameters:¶

model : torch.nn.Module¶

Autoencoder or VAE model.

device : DeviceLike or None, default None¶

Hardware device.

model_type : {"ae", "vae", "auto"} or None, default "auto"¶

Model type. "auto" auto-detects.

use_gmm : bool or None, default None¶

Whether to use GMM in latent space.

p_val : float, default 0.05¶

Significance threshold for non-chunked mode.

config : DriftReconstruction.Config or None, default None¶

Optional configuration object.

See also

DriftReconstruction.Stats

Per-prediction statistics returned in DriftOutput.details.

Examples

>>> from dataeval.utils.models import AE
>>> import torch
>>> model = AE(input_shape=(1, 28, 28))
>>> ref = torch.rand(100, 1, 28, 28).numpy()
>>> detector = DriftReconstruction(model).fit(ref)
>>> test = torch.rand(50, 1, 28, 28).numpy()
>>> result = detector.predict(test)

chunked(chunker=None, chunk_size=None, chunk_count=None, threshold=None)¶

Create a chunked wrapper around this drift detector.

Returns a ChunkedDrift that splits data into chunks during fit and predict, computing per-chunk metrics and comparing against baseline thresholds.

Parameters:¶

chunker : BaseChunker or None, default None¶

Explicit chunker instance.

chunk_size : int or None, default None¶

Create fixed-size chunks of this many samples.

chunk_count : int or None, default None¶

Split into this many equal chunks.

threshold : Threshold or None, default None¶

Threshold strategy for determining drift bounds from baseline. When None, uses the detector’s default threshold.

Returns:¶

A chunked drift wrapper around this detector.

Return type:¶

ChunkedDrift[TDetails]

fit(reference_data)¶

Fit the reconstruction drift detector.

Trains the autoencoder on reference data using parameters from Config (loss_fn, optimizer, epochs, batch_size).

Parameters:¶

reference_data : ArrayLike¶

Reference data.

Return type:¶

Self

predict(data)¶

Predict whether test data has drifted from reference data.

Parameters:¶

data : ArrayLike¶

Test data.

Returns:¶

Drift prediction with reconstruction error statistics.

Return type:¶

DriftOutput[DriftReconstruction.Stats]

property reference_data : numpy.typing.NDArray[numpy.float32]¶

Reference data for drift detection.

Returns:¶

Reference data array.

Return type:¶

NDArray[np.float32]

Raises:¶

NotFittedError – If called before fit().

Classes¶