core.helpers#

Submodule of khiops.core

Helper functions for specific and/or advanced treatments

Functions#

`build_multi_table_dictionary_domain`	Builds a multi-table dictionary domain from a dictionary with a key
`deploy_coclustering`	Deploys an individual-variable coclustering on a data table
`deploy_predictor_for_metrics`	Deploys the necessary data to estimate the performance metrics of a predictor

khiops.core.helpers.build_multi_table_dictionary_domain(dictionary_domain, root_dictionary_name, secondary_table_variable_name)#

Builds a multi-table dictionary domain from a dictionary with a key

Parameters:

dictionary_domainDictionaryDomain: DictionaryDomain object. Its root dictionary must have its key set.
root_dictionary_namestr: Name for the new root dictionary
secondary_table_variable_namestr: Name, in the root dictionary, for the “table” variable of the secondary table.

Raises:

TypeError: Invalid type of an argument
ValueError: Invalid values of an argument: - the dictionary domain doesn’t contain at least a dictionary - the dictionary domain’s root dictionary doesn’t have a key set

khiops.core.helpers.deploy_coclustering(dictionary_file_path_or_domain, dictionary_name, data_table_path, coclustering_file_path, key_variable_names, deployed_variable_name, results_dir, detect_format=True, header_line=None, field_separator=None, output_header_line=True, output_field_separator='\t', max_preserved_information=0, max_cells=0, max_part_numbers=None, build_cluster_variable=True, build_distance_variables=False, build_frequency_variables=False, variables_prefix='', results_prefix='', batch_mode=True, log_file_path=None, output_scenario_path=None, task_file_path=None, trace=False)#

Deploys an individual-variable coclustering on a data table

This procedure generates the following files in results_dir:

Coclustering.kdic: A multi-table dictionary file for further deployments of the coclustering with deploy_model
Keys<data_table_file_name>: A data table file containing only the keys of individual
Deployed<data_table_file_name>: A data table file containing the deployed coclustering model

Parameters:

dictionary_file_path_or_domainstr or DictionaryDomain: Path of a Khiops dictionary file or a DictionaryDomain object.
dictionary_namestr: Name of the dictionary to be analyzed.
data_table_pathstr: Path of the data table file.
coclustering_file_pathstr: Path of the coclustering model file (extension .khc or .khcj)
key_variable_nameslist of str: Names of the variables forming the unique keys of the individuals.
deployed_variable_namestr: Name of the coclustering variable to deploy.
results_dirstr: Path of the results directory.
detect_formatbool, default True: If True detects automatically whether the data table file has a header and its field separator. It’s ignored if header_line or field_separator are set.
header_linebool, optional (default True if detect_format is False): If True it uses the first line of the data as column names. Overrides detect_format if set.
field_separatorstr, optional (default “\t” if detect_format is False): A field separator character, overrides detect_format if set (”” counts as “\t”).
output_header_linebool, default True: If True writes a header line containing the column names in the output table.
output_field_separatorstr, default “\t”: A field separator character (empty string counts as tab).
max_preserved_informationint, default 0: Maximum information preserve in the simplified coclustering. If equal to 0 there is no limit.
max_cellsint, default 0: Maximum number of cells in the simplified coclustering. If equal to 0 there is no limit.
max_part_numbersdict, optional: Dictionary associating variable names to their maximum number of parts to preserve in the simplified coclustering. For variables not present in max_part_numbers there is no limit.
build_cluster_variablebool, default True: If True includes a cluster id variable in the deployment.
build_distance_variablesbool, default False: If True includes a cluster distance variable in the deployment.
build_frequency_variablesbool, default False: If True includes the frequency variables in the deployment.
variables_prefixstr, default “”: Prefix for the variables in the deployment dictionary.
results_prefixstr, default “”: Prefix of the result files.
…: Options of the KhiopsRunner.run method from the class KhiopsRunner.

Returns:

tuple

A 2-tuple containing:

The deployed data table path
The deployment dictionary file path.

Raises:

TypeError: Invalid type dictionary_file_path_or_domain or key_variable_names
ValueError: If the type of the dictionary key variables is not equal to Categorical

Examples

See the following function of the samples.py documentation script:

samples.deploy_coclustering()

khiops.core.helpers.deploy_predictor_for_metrics(dictionary_file_path_or_domain, dictionary_name, data_table_path, output_data_table_path, detect_format=True, header_line=None, field_separator=None, sample_percentage=70, sampling_mode='Include sample', additional_data_tables=None, output_header_line=True, output_field_separator='\t', trace=False)#

Deploys the necessary data to estimate the performance metrics of a predictor

For each instance for each instance it deploys:

The true value of the target variable
The predicted value of the target variable
The probabilities of each value of the target variable (classifier only)

Note

To obtain the data of the default Khiops test dataset use sample_percentage = 70 and sampling_mode = "Exclude sample".

Parameters:

dictionary_file_path_or_domainstr or DictionaryDomain: Path of a Khiops dictionary file or a DictionaryDomain object.
dictionary_namestr: Name of the predictor dictionary.
data_table_pathstr: Path of the data table file.
output_data_table_pathstr: Path of the scores output data file.
detect_formatbool, default True: If True detects automatically whether the data table file has a header and its field separator. It’s ignored if header_line or field_separator are set.
header_linebool, optional (default True if detect_format is False): If True it uses the first line of the data as column names. Overrides detect_format if set.
field_separatorstr, optional (default “\t” if detect_format is False): A field separator character, overrides detect_format if set (”” counts as “\t”).
sample_percentageint, default 70: See sampling_mode option below.
sampling_mode“Include sample” or “Exclude sample”: If equal to “Include sample” deploys the predictor on sample_percentage percent of data and if equal to “Exclude sample” on the complementary 100 - sample_percentage percent of data.
additional_data_tablesdict, optional: A dictionary containing the data paths and file paths for a multi-table dictionary file. For more details see Multi-Table Learning Primer documentation.
output_header_linebool, default True: If True writes a header line containing the column names in the output table.
output_field_separatorstr, default “\t”: A field separator character (”” counts as “\t”).
…: Options of the KhiopsRunner.run method from the class KhiopsRunner.