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authorvrvarma <vv8305@att.com>2019-12-13 10:24:55 -0500
committervrvarma <vv8305@att.com>2019-12-13 10:29:45 -0500
commit430153e1a9489a86cf0ff7942eceb0bf5f1c170c (patch)
treeb22090b80d11761a24d9cbeaa6348704cce2de83 /apps/pci/optimizers/solver/optimizer.py
parent34ba229b31758c38a299a163de0007848b5921be (diff)
osdf rearchitecture into apps and libs
Change-Id: I2db2f8e252bd5e60807b2ffabf5a5b193a789f7a Signed-off-by: vrvarma <vv8305@att.com> Issue-ID: OPTFRA-637
Diffstat (limited to 'apps/pci/optimizers/solver/optimizer.py')
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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
+from collections import defaultdict
+
+import pymzn
+
+from .pci_utils import get_id
+
+BASE_DIR = os.path.dirname(__file__)
+
+
+def pci_optimize(network_cell_info, cell_info_list, request_json):
+ neighbor_edges = get_neighbor_list(network_cell_info)
+ second_level_edges = get_second_level_neighbor(network_cell_info)
+ ignorable_links = get_ignorable_links(network_cell_info, request_json)
+ anr_flag = is_anr(request_json)
+
+ dzn_data = build_dzn_data(cell_info_list, ignorable_links, neighbor_edges, second_level_edges, anr_flag)
+
+ return build_pci_solution(dzn_data, ignorable_links, anr_flag)
+
+
+def build_pci_solution(dzn_data, ignorable_links, anr_flag):
+ mzn_solution = solve(get_mzn_model(anr_flag), dzn_data)
+
+ solution = {'pci': mzn_solution[0]['pci']}
+
+ if anr_flag:
+ removables = defaultdict(list)
+ used_ignorables = mzn_solution[0]['used_ignorables']
+ index = 0
+ for i in ignorable_links:
+ if used_ignorables[index] > 0:
+ removables[i[0]].append(i[1])
+ index += 1
+ solution['removables'] = removables
+ return solution
+
+
+def build_dzn_data(cell_info_list, ignorable_links, neighbor_edges, second_level_edges, anr_flag):
+ 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)
+ }
+ if anr_flag:
+ dzn_data['NUM_IGNORABLE_NEIGHBOR_LINKS'] = len(ignorable_links)
+ dzn_data['IGNORABLE_NEIGHBOR_LINKS'] = get_list(ignorable_links)
+ return dzn_data
+
+
+def get_mzn_model(anr_flag):
+ if anr_flag:
+ mzn_model = os.path.join(BASE_DIR, 'min_confusion_inl.mzn')
+ else:
+ mzn_model = os.path.join(BASE_DIR, 'no_conflicts_no_confusion.mzn')
+ return mzn_model
+
+
+def is_anr(request_json):
+ return 'pci-anr' in request_json["requestInfo"]["optimizers"]
+
+
+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(mzn_model, dzn_data):
+ return pymzn.minizinc(mzn=mzn_model, 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['targetCellId'])
+ if nbr_id and host_id != nbr_id:
+ neighbor_list.add((host_id, nbr_id))
+
+
+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:
+ if comb[0] and comb[1]:
+ second_neighbor_list.add((comb[0], comb[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['targetCellId']))
+ return [list(elem) for elem in list(itertools.combinations(second_nbr_list, 2))]
+
+
+def get_ignorable_links(network_cell_info, request_json):
+ ignorable_list = set()
+ anr_input_list = request_json["cellInfo"].get('anrInputList', [])
+ if anr_input_list:
+ for anr_info in anr_input_list:
+ cell_id = get_id(network_cell_info, anr_info['cellId'])
+ anr_removable = anr_info.get('removeableNeighbors', [])
+ for anr in anr_removable:
+ ignorable_list.add((cell_id, get_id(network_cell_info, anr)))
+ return ignorable_list