fcapy.lattice.pattern_concept

This module provides a class PatternConcept which represents the Pattern Concept object from FCA theory

Classes

PatternConcept(extent_i, extent, intent_i, ...)

A class used to represent Pattern Concept object from FCA theory
class fcapy.lattice.pattern_concept.PatternConcept(extent_i, extent, intent_i, intent, pattern_types: Tuple[AbstractPS], attribute_names: Tuple[str], measures=None, context_hash=None)

A class used to represent Pattern Concept object from FCA theory

Notes

A Pattern Concept (A, d) denotes the pair of subset of objects A and a (complex) description d, s.t. objects A are all the objects described by description d

and description d is the most accurate description of objects A

The set A is called extent, the description d is called intent

The only restriction to a type description d is that should encoded by Pattern Structures from the module fcapy.mvcontext.pattern_structure

property context_hash

Hash value of a MVContext the PatternConcept is based on.

Only the concepts from the same MVContext can be compared

property extent

The set of names of objects described by intent of the PatternConcept

property extent_i

The set of indexes of objects described by intent of the PatternConcept

classmethod from_dict(data, json_ready: bool = False, pattern_types: Optional[Tuple[AbstractPS]] = None)

Construct a FormalConcept from a dictionary data

Parameters

  • data (dict) – Data to load concept from

  • json_ready (bool) – A flag whether to load the json compatible dictionary

  • pattern_types (tuple of pattern structure types) – A tuple of pattern structure classes that encounter in the dictionary data

Return type

Pattern Concept

property intent

A dict of the most specific descriptions of extent by each of pattern structure from pattern_types

indexed by the name of pattern structure in pattern_types

property intent_i

A dict of the most specific descriptions of extent by each of pattern structure from pattern_types

indexed by the index of pattern structure in pattern_types

property pattern_types

A set of subtypes of PatternStructures used to encode the descriptions from intent

classmethod read_json(path: Optional[str] = None, json_data: Optional[str] = None, pattern_types: Optional[Tuple[AbstractPS]] = None)

Load PatternConcept from .json file or from .json encoded string json_data

Parameters

  • path (str) – Path to the .json file to read from (optional)

  • json_data (str) – Json data to read from (optional)

  • pattern_types (tuple[AbstractPS]) – Tuple of additional Pattern Structures not defined in fcapy.mvcontext.pattern_structure that may encounter in the read data

Returns

c

Return type

PatternConcept

property support

The number of objects described by the intent of the PatternConcept

to_dict(json_ready: bool = False)

Convert FormalConcept into a dictionary

write_json(path=None)

Save PatternConcept to .json file of return the .json encoded data if path is None