Unsupervised learning

This module contains the base class for the unsupervised machine learning algorithms.

The unsupervised module implements the concept of unsupervised machine learning models, where the data has no notion of input or output.

This concept is implemented through the MLUnsupervisedAlgo class, which inherits from the MLAlgo class.

class gemseo.mlearning.core.unsupervised.MLUnsupervisedAlgo(data, transformer=None, var_names=None, **parameters)[source]

Unsupervised machine learning algorithm.

Inheriting classes shall overload the MLUnsupervisedAlgo._fit() method.

Parameters
  • data (Dataset) – The learning dataset.

  • transformer (Mapping[str, TransformerType] | None) –

    The strategies to transform the variables. The values are instances of Transformer while the keys are the names of either the variables or the groups of variables, e.g. “inputs” or “outputs” in the case of the regression algorithms. If a group is specified, the Transformer will be applied to all the variables of this group. If None, do not transform the variables.

    By default it is set to None.

  • var_names (Iterable[str] | None) –

    The names of the variables. If None, consider all variables mentioned in the learning dataset.

    By default it is set to None.

  • **parameters (MLAlgoParameterType) – The parameters of the machine learning algorithm.

Raises

ValueError – When both the variable and the group it belongs to have a transformer.

Return type

None

class DataFormatters

Decorators for the internal MLAlgo methods.

Noindex

learn(samples=None, fit_transformers=True)

Train the machine learning algorithm from the learning dataset.

Parameters
  • samples (Sequence[int] | None) –

    The indices of the learning samples. If None, use the whole learning dataset.

    By default it is set to None.

  • fit_transformers (bool) –

    Whether to fit the variable transformers.

    By default it is set to True.

Return type

None

load_algo(directory)

Load a machine learning algorithm from a directory.

Parameters

directory (str | Path) – The path to the directory where the machine learning algorithm is saved.

Return type

None

save(directory=None, path='.', save_learning_set=False)

Save the machine learning algorithm.

Parameters
  • directory (str | None) –

    The name of the directory to save the algorithm.

    By default it is set to None.

  • path (str | Path) –

    The path to parent directory where to create the directory.

    By default it is set to ..

  • save_learning_set (bool) –

    Whether to save the learning set or get rid of it to lighten the saved files.

    By default it is set to False.

Returns

The path to the directory where the algorithm is saved.

Return type

str

input_names: list[str]

The names of the variables.

property is_trained: bool

Return whether the algorithm is trained.

property learning_samples_indices: Sequence[int]

The indices of the learning samples used for the training.