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"""!
@brief CCORE Wrapper for Silhouette method and Silhouette K-Search algorithm.
@authors Andrei Novikov (pyclustering@yandex.ru)
@date 2014-2020
@copyright BSD-3-Clause
"""
from ctypes import c_double, c_longlong, c_size_t, POINTER
from pyclustering.core.converter import convert_data_type
from pyclustering.core.wrapper import ccore_library
from pyclustering.core.pyclustering_package import pyclustering_package, package_builder, package_extractor
class silhouette_ksearch_package_indexer:
SILHOUETTE_KSEARCH_PACKAGE_INDEX_AMOUNT = 0
SILHOUETTE_KSEARCH_PACKAGE_INDEX_SCORE = 1
SILHOUETTE_KSEARCH_PACKAGE_INDEX_SCORES = 2
def silhoeutte(sample, clusters, pointer_metric, data_type):
pointer_data = package_builder(sample, c_double).create()
pointer_clusters = package_builder(clusters, c_size_t).create()
c_data_type = convert_data_type(data_type)
ccore = ccore_library.get()
ccore.silhouette_algorithm.restype = POINTER(pyclustering_package)
package = ccore.silhouette_algorithm(pointer_data, pointer_clusters, pointer_metric, c_data_type)
result = package_extractor(package).extract()
ccore.free_pyclustering_package(package)
return result
def silhoeutte_ksearch(sample, kmin, kmax, allocator, random_state):
random_state = random_state or -1
pointer_data = package_builder(sample, c_double).create()
ccore = ccore_library.get()
ccore.silhouette_ksearch_algorithm.restype = POINTER(pyclustering_package)
package = ccore.silhouette_ksearch_algorithm(pointer_data, c_size_t(kmin), c_size_t(kmax), c_size_t(allocator), c_longlong(random_state))
results = package_extractor(package).extract()
ccore.free_pyclustering_package(package)
return (results[silhouette_ksearch_package_indexer.SILHOUETTE_KSEARCH_PACKAGE_INDEX_AMOUNT][0],
results[silhouette_ksearch_package_indexer.SILHOUETTE_KSEARCH_PACKAGE_INDEX_SCORE][0],
results[silhouette_ksearch_package_indexer.SILHOUETTE_KSEARCH_PACKAGE_INDEX_SCORES])
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