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# -------------------------------------------------------------------------
# Copyright (c) 2018 AT&T Intellectual Property
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# -------------------------------------------------------------------------
#
import itertools
import os
import pymzn
from .pci_utils import get_id
BASE_DIR = os.path.dirname(__file__)
MZN_FILE_NAME = os.path.join(BASE_DIR, 'no_conflicts_no_confusion.mzn')
def pci_optimize(network_cell_info, cell_info_list):
neighbor_edges = get_neighbor_list(network_cell_info)
second_level_edges = get_second_level_neighbor(network_cell_info)
dzn_data = {
'NUM_NODES': len(cell_info_list),
'NUM_PCIS': len(cell_info_list),
'NUM_NEIGHBORS': len(neighbor_edges),
'NEIGHBORS': get_list(neighbor_edges),
'NUM_SECOND_LEVEL_NEIGHBORS': len(second_level_edges),
'SECOND_LEVEL_NEIGHBORS': get_list(second_level_edges)
}
return solve(dzn_data)
def get_list(edge_list):
array_list = []
for s in edge_list:
array_list.append([s[0], s[1]])
return sorted(array_list)
def solve(dzn_data):
return pymzn.minizinc(MZN_FILE_NAME, data=dzn_data)
def get_neighbor_list(network_cell_info):
neighbor_list = set()
for cell in network_cell_info['cell_list']:
add_to_neighbor_list(network_cell_info, cell, neighbor_list)
return neighbor_list
def add_to_neighbor_list(network_cell_info, cell, neighbor_list):
for nbr in cell.get('nbr_list', []):
host_id = cell['id']
nbr_id = get_id(network_cell_info, nbr['cellId'])
if host_id != nbr_id:
entry = sorted([host_id, nbr_id])
neighbor_list.add((entry[0], entry[1]))
def get_second_level_neighbor(network_cell_info):
second_neighbor_list = set()
for cell in network_cell_info['cell_list']:
comb_list = build_second_level_list(network_cell_info, cell)
for comb in comb_list:
s = sorted(comb)
second_neighbor_list.add((s[0], s[1]))
return sorted(second_neighbor_list)
def build_second_level_list(network_cell_info, cell):
second_nbr_list = []
for nbr in cell.get('nbr_list', []):
second_nbr_list.append(get_id(network_cell_info, nbr['cellId']))
return [list(elem) for elem in list(itertools.combinations(second_nbr_list, 2))]
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