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"""! |
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@brief CCORE Wrapper for metrics. |
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@authors Andrei Novikov ([email protected]) |
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@date 2014-2018 |
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@copyright GNU Public License |
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@cond GNU_PUBLIC_LICENSE |
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PyClustering is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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PyClustering is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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@endcond |
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""" |
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from pyclustering.core.wrapper import ccore_library; |
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from pyclustering.core.pyclustering_package import package_builder, package_extractor, pyclustering_package; |
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from ctypes import c_double, c_size_t, POINTER, c_void_p, CFUNCTYPE; |
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from pyclustering.utils.metric import type_metric; |
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metric_callback = CFUNCTYPE(c_double, POINTER(pyclustering_package), POINTER(pyclustering_package)); |
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class metric_wrapper: |
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def __init__(self, type_metric, arguments, func): |
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self.__func = lambda p1, p2: func(package_extractor(p1).extract(), package_extractor(p2).extract()); |
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package_arguments = package_builder(arguments, c_double).create(); |
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ccore = ccore_library.get(); |
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ccore.metric_create.restype = POINTER(c_void_p); |
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self.__pointer = ccore.metric_create(c_size_t(type_metric), package_arguments, metric_callback(self.__func)); |
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def __del__(self): |
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if self.__pointer: |
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ccore = ccore_library.get(); |
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ccore.metric_destroy(self.__pointer); |
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def __call__(self, point1, point2): |
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point_package1 = package_builder(point1, c_double).create(); |
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point_package2 = package_builder(point2, c_double).create(); |
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ccore = ccore_library.get(); |
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ccore.metric_calculate.restype = c_double; |
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return ccore.metric_calculate(self.__pointer, point_package1, point_package2); |
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def get_pointer(self): |
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return self.__pointer; |
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@staticmethod |
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def create_instance(metric): |
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mtype = metric.get_type(); |
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arguments = []; |
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if mtype == type_metric.MINKOWSKI: |
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arguments = [ metric.get_arguments().get('degree') ]; |
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return metric_wrapper(mtype, arguments, metric.get_function()); |
annoviko /
pyclustering
It is generally a bad practice to shadow variables from the outer-scope. In most cases, this is done unintentionally and might lead to unexpected behavior: