skactiveml.pool.SubSamplingWrapper#
- class skactiveml.pool.SubSamplingWrapper(query_strategy=None, max_candidates=None, missing_label=nan, random_state=None)[source]#
Bases:
SingleAnnotatorPoolQueryStrategySub-sampling Wrapper.
This class implements a wrapper for single-annotator pool-based strategies that randomly sub-samples a set of candidates before computing their utilities.
- Parameters
- query_strategyskactiveml.base.SingleAnnotatorPoolQueryStrategy
The strategy used for computing the utilities of the candidate sub-sample.
- max_candidatesint or float
Determines the number of candidates. If max_candidates is an integer, max_candidates is the maximum number of candidates whose utilities are computed. If max_candidates is a float, max_candidates is the fraction of the original number of candidates.
- missing_labelscalar or string or np.nan or None, default=np.nan
Value to represent a missing label.
- random_stateint or np.random.RandomState
The random state to use.
Methods
Get metadata routing of this object.
get_params([deep])Get parameters for this estimator.
query(X, y[, candidates, batch_size, ...])Determines for which candidate samples labels are to be queried.
set_params(**params)Set the parameters of this estimator.
- get_metadata_routing()#
Get metadata routing of this object.
Please check User Guide on how the routing mechanism works.
- Returns
- routingMetadataRequest
A
MetadataRequestencapsulating routing information.
- get_params(deep=True)#
Get parameters for this estimator.
- Parameters
- deepbool, default=True
If True, will return the parameters for this estimator and contained subobjects that are estimators.
- Returns
- paramsdict
Parameter names mapped to their values.
- query(X, y, candidates=None, batch_size=1, return_utilities=False, **query_kwargs)[source]#
Determines for which candidate samples labels are to be queried.
- Parameters
- Xarray-like of shape (n_samples, n_features)
Training data set, usually complete, i.e. including the labeled and unlabeled samples.
- yarray-like of shape (n_samples)
Labels of the training data set (possibly including unlabeled ones indicated by self.MISSING_LABEL).
- candidatesNone or array-like of shape (n_candidates), dtype=int or
array-like of shape (n_candidates, n_features), optional (default=None) If candidates is None, the unlabeled samples from (X,y) are considered as candidates. If candidates is of shape (n_candidates) and of type int, candidates is considered as the indices of the samples in (X,y). If candidates is of shape (n_candidates, n_features), the candidates are directly given in candidates (not necessarily contained in X). This is not supported by all query strategies.
- batch_sizeint, optional (default=1)
The number of samples to be selected in one AL cycle.
- return_utilitiesbool, optional (default=False)
If true, also return the utilities based on the query strategy.
- **query_kwargsdict-like
Further keyword arguments are passed to the query method of the query_strategy object.
- Returns
- query_indicesnumpy.ndarray of shape (batch_size)
The query_indices indicate for which candidate sample a label is to queried, e.g., query_indices[0] indicates the first selected sample. If candidates is None or of shape (n_candidates), the indexing refers to samples in X. If candidates is of shape (n_candidates, n_features), the indexing refers to samples in candidates.
- utilitiesnumpy.ndarray of shape (batch_size, n_samples) or
numpy.ndarray of shape (batch_size, n_candidates) The utilities of samples after each selected sample of the batch, e.g., utilities[0] indicates the utilities used for selecting the first sample (with index query_indices[0]) of the batch. Utilities for labeled samples will be set to np.nan. If candidates is None or of shape (n_candidates), the indexing refers to samples in X. If candidates is of shape (n_candidates, n_features), the indexing refers to samples in candidates.
- set_params(**params)#
Set the parameters of this estimator.
The method works on simple estimators as well as on nested objects (such as
Pipeline). The latter have parameters of the form<component>__<parameter>so that it’s possible to update each component of a nested object.- Parameters
- **paramsdict
Estimator parameters.
- Returns
- selfestimator instance
Estimator instance.
