Preprocessing - preprocessor

[JanBenisek]

First implement changes in target_encoder and categorical_data_processor before starting this.

• Add parameter model_type which can be [classification, regression] to the input.

  cobra/cobra/preprocessing/preprocessor.py

  Line 56 in 6ef6723

  def __init__(self, categorical_data_processor: CategoricalDataProcessor,

• Make sure to change the from_params:

  cobra/cobra/preprocessing/preprocessor.py

  Line 68 in 6ef6723

  def from_params(cls,

• Make sure that the pipeline has also this new parameter when saving (pipeline["model_type"] = 'classification'), loading and validating:

  cobra/cobra/preprocessing/preprocessor.py

  Line 396 in 48d8a9a

  def serialize_pipeline(self) -> dict:

  and

  cobra/cobra/preprocessing/preprocessor.py

  Line 424 in 48d8a9a

  def _is_valid_pipeline(pipeline: dict) -> bool:

• Document and write/modify unit tests

[sandervh14]

Reopening to file a bugfix in the creation of the preprocessor with from_params().