def _print_forest(graph):
"""
Nice ascii representation of a forest
Ignore:
graph = nx.balanced_tree(r=2, h=3, create_using=nx.DiGraph)
_print_forest(graph)
graph = CategoryTree.demo('coco').graph
_print_forest(graph)
"""
assert nx.is_forest(graph)
encoding = to_directed_nested_tuples(graph)
def _recurse(encoding, indent=''):
for idx, item in enumerate(encoding):
node, data, children = item
if idx == len(encoding) - 1:
this_prefix = indent + '└── '
next_prefix = indent + ' '
else:
this_prefix = indent + '├── '
next_prefix = indent + '│ '
label = graph.nodes[node].get('label', node)
print(this_prefix + str(label))
_recurse(children, indent=next_prefix)
_recurse(encoding)
def __init__(self, graph=None):
"""
Args:
graph (nx.DiGraph):
either the graph representing a category hierarchy
"""
if graph is None:
graph = nx.DiGraph()
else:
if len(graph) > 0:
if not nx.is_directed_acyclic_graph(graph):
raise ValueError('The category graph must a DAG')
if not nx.is_forest(graph):
raise ValueError('The category graph must be a forest')
if not isinstance(graph, nx.Graph):
raise TypeError(
'Input to CategoryTree must be a networkx graph not {}'.
format(type(graph)))
self.graph = graph # :type: nx.Graph
# Note: nodes are class names
self.id_to_node = None
self.node_to_id = None
self.node_to_idx = None
self.idx_to_node = None
self.idx_groups = None
self._build_index()
def add_edge(self, u, v, *args, **kwargs):
changed = False
if u == v:
if self.flags['strict']:
raise ValueError('Edge must be between two unique nodes!')
return changed
elif self._undirected.has_edge(u, v):
self.remove_edges_from([[u, v], [v, u]])
elif len(self.nodes()) > 0:
try:
path = nx.shortest_path(self._undirected, u, v)
if self.flags['strict']:
raise ValueError(
'Multiple edge path exists between nodes!')
self.disconnect_path(path)
changed = True
except (nx.NetworkXError, nx.NetworkXNoPath, nx.NetworkXException):
pass
self._undirected.add_edge(u, v)
super(self.__class__, self).add_edge(u, v, *args, **kwargs)
if self.flags['assert_forest']:
# this is quite slow but makes very sure structure is correct
# so is mainly used for testing
assert nx.is_forest(nx.Graph(self))
return changed
def run_graph(graph):
"""
:param graph:
:return:
"""
results = []
if nx.is_forest(graph):
while len(leaves(graph)) > 0:
current_leaves = leaves(graph)
for n in current_leaves:
for edge in graph.edges_iter(n):
local_data = graph.node[n]['data'].copy()
if 'data' not in graph.node[edge[1]]:
graph.node[edge[1]]['data'] = apply_edge(local_data, graph.edge[edge[0]][edge[1]]['transformation']).copy()
else:
graph.node[edge[1]]['data'] = pd.merge( left=graph.node[edge[1]]['data'],
right=apply_edge(local_data,
graph.edge[edge[0]][edge[1]]['transformation']).copy(),
how='left',
left_on=graph.node[edge[1]]['match_keys'],
right_on=graph.node[edge[1]]['match_keys']
)
if 'producer' in graph.node[n]:
if graph.node[n]['producer']:
results.append(graph.node[n]['data'])
graph.remove_node(n)
return results
def _print_forest(graph):
"""
Nice ascii representation of a forest
Ignore:
graph = nx.balanced_tree(r=2, h=3, create_using=nx.DiGraph)
_print_forest(graph)
graph = CategoryTree.demo('coco').graph
_print_forest(graph)
"""
if len(graph.nodes) == 0:
print('--')
return
assert nx.is_forest(graph)
def _recurse(node, indent='', islast=False):
if islast:
this_prefix = indent + '└── '
next_prefix = indent + ' '
else:
this_prefix = indent + '├── '
next_prefix = indent + '│ '
label = graph.nodes[node].get('label', node)
print(this_prefix + str(label))
graph.succ[node]
children = graph.succ[node]
for idx, child in enumerate(children, start=1):
islast_next = (idx == len(children))
_recurse(child, indent=next_prefix, islast=islast_next)
sources = [n for n in graph.nodes if graph.in_degree[n] == 0]
for idx, node in enumerate(sources, start=1):
islast_next = (idx == len(sources))
_recurse(node, indent='', islast=islast_next)
def edge_conditions(t, h, d):
yield 0 <= d < N
#yield (h, d) not in t.edges()
#yield (d, h) not in t.edges()
test_t = copy.deepcopy(t)
test_t.add_edge(h, d)
yield nx.is_forest(test_t)
def add_edge(self, u, v, *args, **kwargs):
changed = False
if u == v:
if self.flags['strict']:
raise ValueError('Edge must be between two unique nodes!')
return changed
if self._undirected.has_edge(u, v):
self.remove_edges_from([[u, v], [v, u]])
elif len(self.nodes()) > 0:
try:
path = nx.shortest_path(self._undirected, u, v)
if self.flags['strict']:
raise ValueError(
'Multiple edge path exists between nodes!')
self.disconnect_path(path)
changed = True
except (nx.NetworkXError, nx.NetworkXNoPath, nx.NetworkXException):
pass
self._undirected.add_edge(u, v)
super(self.__class__, self).add_edge(u, v, *args, **kwargs)
if self.flags['assert_forest']:
# this is quite slow but makes very sure structure is correct
# so is mainly used for testing
assert nx.is_forest(nx.Graph(self))
return changed
def tree_depth(graph, root=None):
"""
Maximum depth of the forest / tree
Example:
>>> from kwcoco.category_tree import *
>>> graph = nx.balanced_tree(r=2, h=3, create_using=nx.DiGraph)
>>> tree_depth(graph)
4
>>> tree_depth(nx.balanced_tree(r=2, h=0, create_using=nx.DiGraph))
1
"""
if len(graph) == 0:
return 0
if root is not None:
assert root in graph.nodes
assert nx.is_forest(graph)
def _inner(root):
if root is None:
return max(it.chain([0], (_inner(n) for n in source_nodes(graph))))
else:
return max(
it.chain([0], (_inner(n) for n in graph.successors(root)))) + 1
depth = _inner(root)
return depth
def run_graph(graph):
"""
:param graph:
:return:
"""
results = []
if nx.is_forest(graph):
while len(leaves(graph)) > 0:
current_leaves = leaves(graph)
for n in current_leaves:
for edge in graph.edges_iter(n):
local_data = graph.node[n]['data'].copy()
if 'data' not in graph.node[edge[1]]:
graph.node[edge[1]]['data'] = apply_edge(
local_data, graph.edge[edge[0]][edge[1]]
['transformation']).copy()
else:
graph.node[edge[1]]['data'] = pd.merge(
left=graph.node[edge[1]]['data'],
right=apply_edge(
local_data, graph.edge[edge[0]][edge[1]]
['transformation']).copy(),
how='left',
left_on=graph.node[edge[1]]['match_keys'],
right_on=graph.node[edge[1]]['match_keys'])
if 'producer' in graph.node[n]:
if graph.node[n]['producer']:
results.append(graph.node[n]['data'])
graph.remove_node(n)
return results
def _validate_graph(self, graph):
"""Private: Validate a graph is suitable for visualizer."""
if not issubclass(type(graph), ScaffoldGraph):
raise ValueError(f'{graph} must be a subclass of ScaffoldGraph')
if self._requires_tree:
if not nx.is_tree(graph) or nx.is_forest(graph):
msg = '{} requires a tree/forest structured graph'
msg.format(self.__class__.__name__)
raise ValueError(msg)
return graph
def tree_or_forest(graph):
if nx.is_tree(graph):
print(
"The Minimum Spanning Tree Generated from this Network is a Tree")
elif nx.is_forest(graph):
print(
"The Minimum Spanning Tree Generated from this Network is a Forest"
)
else:
print("Neither a Tree nor Forest")
def show_props(graph):
print("Nodes: {}, Edges: {}".format(len(graph.nodes), len(graph.edges)))
treewidth, decomp = approximation.treewidth_min_degree(graph)
print("TreeWidth: {}".format(treewidth))
cluster_ceof = approximation.clustering_coefficient.average_clustering(
graph)
print("Average Clustering Coefficient: {}".format(cluster_ceof))
print("Is Acyclic: {}".format(nx.is_forest(graph)))
node, degree = max([(n, d) for n, d in graph.degree()], key=lambda x: x[1])
print("Max degree: {}".format(degree))
def search_longest_path_efficient(G, weight='weight'):
"""
Info: Search algorithm to find longest path in a graph.
Breadth first search (BFS) used twice for acyclic graphs.
BFS over all endnodes used for cyclic graphs
input: nx.Graph
optional: edge paramater weight -> either 'weight' or 'thick'
output: [list] of all paths between all nodes, [list] of length of each path
"""
def _bfs_tree(G):
# twice BFS in undirected acyclic graph (Tree) to find endnodes
# bfs for longest path is performed in Directed Tree
endnodes = [x for x in G.nodes() if G.degree(x) == 1]
DiTree1 = nx.traversal.bfs_tree(G, endnodes[0])
SG1 = G.subgraph(nx.dag_longest_path(DiTree1, weight=weight))
new_root = [
x for x in SG1.nodes() if G.degree(x) == 1 and x != endnodes[0]
][0]
DiTree2 = nx.traversal.bfs_tree(SG1, new_root)
SG2 = G.subgraph(nx.dag_longest_path(DiTree2, weight=weight))
return SG2, nx.dag_longest_path_length(DiTree2)
def _exhaustive(G):
# Finds longest shortest path by iterating over all endnodes
path_list = []
path_length = []
# node_pairs = []
endnodes = [x for x in G.nodes() if G.degree(x) == 1]
for source in endnodes:
for target in endnodes:
sh_p = nx.shortest_path(G, source, target, weight=weight)
sh_p_l = nx.shortest_path_length(G,
source,
target,
weight=weight)
path_list.append(sh_p)
path_length.append(sh_p_l)
# node_pairs.append([source, target])
nbunch = path_list[np.argmax(path_length)]
SG = G.subgraph(nbunch)
return SG, np.max(
path_length) #, nbunch, node_pairs[np.argmax(path_length)]
if nx.tree.is_tree(G): #single connected acyclic graph
return _bfs_tree(G)
else:
if nx.is_forest(G): #multiple disconnected trees
#todo: loop over connected components (=trees), compare longest branches
return _exhaustive(G)
else: #cyclic graph
return _exhaustive(G)
def freqCount(thread_map):
dictionary = corpora.Dictionary.load("gensim_dictionary")
maptofreq = dict()
for head in sorted(thread_map):
assert (nx.is_forest(thread_map[head]))
thread_string = ""
for node, data in thread_map[head].nodes_iter(data=True):
thread_string += " " + data["body"]
words_in_thread = re.findall(r"[\w'-]+", thread_string.lower())
word_vector = dictionary.doc2bow(words_in_thread)
maptofreq[head] = word_vector
return maptofreq
def is_merge_tree(M):
acyclic = nx.is_forest(M)
connected = nx.is_connected(M)
red = reduced(M)
print('---')
print("M is acyclic: " + str(acyclic))
print("M is connected: " + str(connected))
print("M is reduced: " + str(red))
print('---')
return acyclic and connected and red
def tree(self):
rslt = {}
rslt['is_tree'] = nx.is_tree(self.graph)
rslt['is_forest'] = nx.is_forest(self.graph)
if self.directed == 'directed':
rslt['is_arborescence'] = nx.is_arborescence(self.graph)
rslt['is_branching'] = nx.is_branching(self.graph)
fname_tree = self.DIR + '/tree.json'
with open(fname_tree, "w") as f:
json.dump(rslt, f, cls=SetEncoder, indent=2)
print(fname_tree)
def attempt():
result = nx.Graph()
result.add_nodes_from(range(len(dl_seq) + 1))
for dl, k in dl_counter.items():
possibles = possible_edges_with_dl(result, dl)
if not possibles:
return None
else:
possible_sets = itertools.combinations(possibles, k)
edge_set = random.choice(list(possible_sets))
result.add_edges_from(edge_set)
if not nx.is_forest(result):
return None
return result
def is_tree(self) -> bool:
"""Returns whether neuron is a tree. Alsos returns True if neuron
consists of multiple separate trees.
See also
--------
networkx.is_forest()
Function used to test whether neuron is a tree.
:attr:`TreeNeuron.cycles`
If your neuron is not a tree, this will help you identify
cycles.
"""
return nx.is_forest(self.graph)
def number_of_rforest(G, r1, r2):
edge_list = G.edges()
count = 0
for e in powerset(range(len(edge_list))):
H = nx.Graph()
H.add_nodes_from(range(len(G.nodes())))
#print H.nodes()
for i in e:
H.add_edge(*edge_list[i])
#print H.edges()
if not nx.has_path(H, r1, r2) and nx.number_connected_components(H) == 2 and nx.is_forest(H):
count += 1
#print H.edges()
return count
def number_of_rforest(G, r1, r2):
edge_list = G.edges()
count = 0
for e in powerset(range(len(edge_list))):
H = nx.Graph()
H.add_nodes_from(range(len(G.nodes())))
#print H.nodes()
for i in e:
H.add_edge(*edge_list[i])
#print H.edges()
if not nx.has_path(H, r1, r2) and nx.number_connected_components(
H) == 2 and nx.is_forest(H):
count += 1
#print H.edges()
return count
def number_of_pathmatching(G):
edge_list = G.edges()
count = 0
for e in powerset(range(len(edge_list))):
H = nx.Graph()
H.add_nodes_from(range(len(G.nodes())))
#print H.nodes()
for i in e:
H.add_edge(*edge_list[i])
#print H.edges()
is_pm = True
for v in G.nodes():
if nx.degree(H, v) > 2:
is_pm = False
break
if is_pm:
if nx.is_forest(H):
count += 1
#print H.edges()
return count
def number_of_pathmatching(G):
edge_list = G.edges()
count = 0
for e in powerset(range(len(edge_list))):
H = nx.Graph()
H.add_nodes_from(range(len(G.nodes())))
#print H.nodes()
for i in e:
H.add_edge(*edge_list[i])
#print H.edges()
is_pm = True
for v in G.nodes():
if nx.degree(H, v) > 2:
is_pm = False
break
if is_pm:
if nx.is_forest(H):
count += 1
#print H.edges()
return count
def two_char_compatibility_test(c1,c2, ancestral_type_known = False, ancestral_type = (0,0)):
'''
Takes two columns of equal length (representing characters on a phylogeny),
and returns true if and only if they are compatible (in the sense that the
number of mutations nessecary to place both characters on a single tree is
the sum of the numbr of mutations nessecary to place each character on a
tree individually)
'''
if len(c1) != len(c2): raise(ValueError('Cannot compare characters of unequal length'))
#convert input to list
c1_list = list(c1)
c2_list = list(c2)
if ancestral_type_known:
c1_list.append(ancestral_type[0])
c2_list.append(ancestral_type[1])
# G_dict = partition_intersection_graph([c1_list,c2_list])
# G_nx = nx.Graph(G_dict['E'])
G_nx = partition_intersection_graph([c1_list,c2_list])
return nx.is_forest(G_nx)
def get_roots(tree: nx.DiGraph, g: nx.DiGraph) -> Iterable[Hashable]:
"""Iterate through the roots in the tree and any orphaned nodes in the graph
:param tree: Hierarchical graph
:type tree: nx.DiGraph
:param g: [description]
:type g: nx.DiGraph
:return: [description]
:rtype: Hashable
:yield: [description]
:rtype: Hashable
"""
if len(tree) == 0:
# graph is empty
return []
assert nx.is_forest(
tree
), "The given hierarchy should be a NetworkX DiGraph that is also a Forest"
for node, degree in tree.in_degree():
if degree == 0:
yield node
for node in g.nodes():
if node not in tree:
yield node
def test_is_not_forest(self):
assert_false(nx.is_forest(self.N4))
assert_false(nx.is_forest(self.N6))
assert_false(nx.is_forest(self.NF1))
def test_multidigraph_forest(self):
assert_false(nx.is_forest(self.N3))
import matplotlib.pyplot as plt
import networkx as nx
from definition import G
if nx.is_forest(G) :
print('ffforest')
def leaves(graph):
return([n for n,d in graph.in_degree().items() if d==0])
while len(leaves(G)) > 0:
for n in leaves(G):
print(n)
G.remove_node(n)
#
# for n,d in G.in_degree().items():
# print(n)
# print(d)
# print(nx.all_shortest_paths(G))
# print('ddd {here}'.format(here= G.number_of_nodes()))
# nx.draw(G)
# plt.show()
def maximum_common_ordered_tree_embedding(tree1, tree2, node_affinity='auto'):
"""
Finds the maximum common subtree-embedding between two ordered trees.
A tree S is an embedded subtree of T if it can be obtained from T by a
series of edge contractions.
Note this produces a subtree embedding, which is not necessarilly a
subgraph isomorphism (although a subgraph isomorphism is also an
embedding.)
The maximum common embedded subtree problem can be solved in in
`O(n1 * n2 * min(d1, l1) * min(d2, l2))` time on ordered trees with n1 and
n2 nodes, of depth d1 and d2 and with l1 and l2 leaves, respectively
Implements algorithm described in [1]_.
References:
On the Maximum Common Embedded Subtree Problem for Ordered Trees
https://pdfs.semanticscholar.org/0b6e/061af02353f7d9b887f9a378be70be64d165.pdf
http://algo.inria.fr/flajolet/Publications/FlSiSt90.pdf
Notes:
Exact algorithms for computing the tree edit distance between unordered trees - https://pdf.sciencedirectassets.com/271538/1-s2.0-S0304397510X00299/1-s2.0-S0304397510005463/main.pdf ?
Tree Edit Distance and Common Subtrees - https://upcommons.upc.edu/bitstream/handle/2117/97554/R02-20.pdf
A Survey on Tree Edit Distance and Related Problems - https://grfia.dlsi.ua.es/ml/algorithms/references/editsurvey_bille.pdf
Args:
tree1 (nx.OrderedDiGraph): first ordered tree
tree2 (nx.OrderedDiGraph): second ordered tree
node_affinity (callable): function
Example:
>>> from netharn.initializers._nx_extensions import * # NOQA
>>> from netharn.initializers._nx_extensions import _lcs, _print_forest
>>> def random_ordered_tree(n, seed=None):
>>> tree = nx.dfs_tree(nx.random_tree(n, seed=seed))
>>> otree = nx.OrderedDiGraph()
>>> otree.add_edges_from(tree.edges)
>>> return otree
>>> tree1 = random_ordered_tree(10, seed=1)
>>> tree2 = random_ordered_tree(10, seed=2)
>>> print('tree1')
>>> _print_forest(tree1)
>>> print('tree2')
>>> _print_forest(tree2)
>>> embedding1, embedding2 = maximum_common_ordered_tree_embedding(tree1, tree2 )
>>> print('embedding1')
>>> _print_forest(embedding1)
>>> print('embedding2')
>>> _print_forest(embedding2)
"""
if not (isinstance(tree1, nx.OrderedDiGraph) and nx.is_forest(tree1)):
raise nx.NetworkXNotImplemented(
'only implemented for directed ordered trees')
if not (isinstance(tree1, nx.OrderedDiGraph) and nx.is_forest(tree2)):
raise nx.NetworkXNotImplemented(
'only implemented for directed ordered trees')
# Convert the trees to balanced sequences
sequence1, open_to_close, toks = tree_to_seq(tree1,
open_to_close=None,
toks=None)
sequence2, open_to_close, toks = tree_to_seq(tree2, open_to_close, toks)
seq1 = sequence1
seq2 = sequence2
open_to_tok = ub.invert_dict(toks)
# Solve the longest common balanced sequence problem
best, value = longest_common_balanced_sequence(seq1,
seq2,
open_to_close,
open_to_tok=open_to_tok,
node_affinity=node_affinity)
subseq1, subseq2 = best
# Convert the subsequence back into a tree
embedding1 = seq_to_tree(subseq1, open_to_close, toks)
embedding2 = seq_to_tree(subseq2, open_to_close, toks)
return embedding1, embedding2
def maximum_common_ordered_subtree_isomorphism(tree1,
tree2,
node_affinity='auto'):
"""
Isomorphic version of `maximum_common_ordered_tree_embedding`.
CommandLine:
xdoctest -m /home/joncrall/code/netharn/netharn/initializers/_nx_extensions.py maximum_common_ordered_subtree_isomorphism:1 --profile && cat profile_output.txt
Example:
>>> from netharn.initializers._nx_extensions import * # NOQA
>>> from netharn.initializers._nx_extensions import _lcs, _print_forest
>>> def random_ordered_tree(n, seed=None):
>>> tree = nx.dfs_tree(nx.random_tree(n, seed=seed))
>>> otree = nx.OrderedDiGraph()
>>> otree.add_edges_from(tree.edges)
>>> return otree
>>> tree1 = random_ordered_tree(10, seed=3)
>>> tree2 = random_ordered_tree(10, seed=2)
>>> tree1.add_edges_from(tree2.edges, weight=1)
>>> tree1 = nx.minimum_spanning_arborescence(tree1)
>>> tree2.add_edges_from(tree1.edges, weight=1)
>>> tree2 = nx.minimum_spanning_arborescence(tree2)
>>> tree1.remove_edge(4, 7)
>>> tree1.remove_edge(4, 9)
>>> tree1.add_edge(4, 10)
>>> tree1.add_edge(10, 7)
>>> tree1.add_edge(10, 9)
>>> #tree1.add_edges_from([(9, 11), (11, 12), (12, 13), (13, 14)])
>>> #tree2.add_edges_from([(9, 11), (11, 12), (12, 13), (13, 14)])
>>> tree1.add_edges_from([(9, 11), (11, 12)])
>>> tree2.add_edges_from([(9, 11), (11, 12)])
>>> tree2.add_edge(100, 0)
>>> tree1.add_edge(102, 100)
>>> tree1.add_edge(100, 101)
>>> tree1.add_edge(101, 0)
>>> tree1.add_edge(5, 201)
>>> tree1.add_edge(5, 202)
>>> tree1.add_edge(5, 203)
>>> tree1.add_edge(201, 2000)
>>> tree1.add_edge(2000, 2001)
>>> tree1.add_edge(2001, 2002)
>>> tree1.add_edge(2002, 2003)
>>> tree2.add_edge(5, 202)
>>> tree2.add_edge(5, 203)
>>> tree2.add_edge(5, 201)
>>> tree2.add_edge(201, 2000)
>>> tree2.add_edge(2000, 2001)
>>> tree2.add_edge(2001, 2002)
>>> tree2.add_edge(2002, 2003)
>>> print('-----')
>>> print('tree1')
>>> _print_forest(tree1)
>>> print('tree2')
>>> _print_forest(tree2)
>>> subtree1, subtree2 = maximum_common_ordered_subtree_isomorphism(tree1, tree2 )
>>> print('-----')
>>> print('subtree1')
>>> _print_forest(subtree1)
>>> print('subtree2')
>>> _print_forest(subtree2)
>>> embedding1, embedding2 = maximum_common_ordered_tree_embedding(tree1, tree2)
>>> print('-----')
>>> print('embedding1')
>>> _print_forest(embedding1)
>>> print('embedding2')
>>> _print_forest(embedding2)
>>> if 0:
>>> ti = timerit.Timerit(6, bestof=2, verbose=2)
>>> for timer in ti.reset('isomorphism'):
>>> with timer:
>>> maximum_common_ordered_subtree_isomorphism(tree1, tree2 )
>>> for timer in ti.reset('embedding'):
>>> with timer:
>>> maximum_common_ordered_tree_embedding(tree1, tree2 )
>>> from networkx import isomorphism
>>> assert isomorphism.DiGraphMatcher(tree1, subtree1).subgraph_is_isomorphic()
>>> assert isomorphism.DiGraphMatcher(tree2, subtree2).subgraph_is_isomorphic()
>>> list(isomorphism.DiGraphMatcher(tree1, tree2).subgraph_isomorphisms_iter())
>>> list(isomorphism.DiGraphMatcher(tree1, tree2).subgraph_monomorphisms_iter())
>>> list(isomorphism.DiGraphMatcher(subtree1, subtree2).subgraph_isomorphisms_iter())
>>> list(isomorphism.DiGraphMatcher(tree1, subtree1).subgraph_isomorphisms_iter())
>>> list(isomorphism.DiGraphMatcher(tree2, subtree2).subgraph_isomorphisms_iter())
Example:
>>> from netharn.initializers._nx_extensions import * # NOQA
>>> from netharn.initializers._nx_extensions import _lcs, _print_forest
>>> def random_ordered_tree(n, seed=None):
>>> if n > 0:
>>> tree = nx.dfs_tree(nx.random_tree(n, seed=seed))
>>> otree = nx.OrderedDiGraph()
>>> if n > 0:
>>> otree.add_edges_from(tree.edges)
>>> return otree
>>> import random
>>> rng = random.Random(90269698983701724775426457020022)
>>> num = 1000
>>> def _gen_seeds(num):
>>> for _ in range(num):
>>> yield (rng.randint(0, 50), rng.randint(0, 50), rng.randint(0, 2 ** 64), rng.randint(0, 2 ** 64))
>>> for n1, n2, s1, s2 in ub.ProgIter(_gen_seeds(num=num), total=num, verbose=3):
>>> tree1 = random_ordered_tree(n1, seed=s1)
>>> tree2 = random_ordered_tree(n2, seed=s2)
>>> #print('-----')
>>> #print('tree1')
>>> #_print_forest(tree1)
>>> #print('tree2')
>>> #_print_forest(tree2)
>>> subtree1, subtree2 = maximum_common_ordered_subtree_isomorphism(tree1, tree2, node_affinity='auto')
>>> #print('-----')
>>> #print('subtree1')
>>> #_print_forest(subtree1)
>>> #print('subtree2')
>>> #_print_forest(subtree2)
>>> from networkx import isomorphism
>>> assert isomorphism.DiGraphMatcher(tree1, subtree1).subgraph_is_isomorphic()
>>> assert isomorphism.DiGraphMatcher(tree2, subtree2).subgraph_is_isomorphic()
"""
try:
if not (isinstance(tree1, nx.OrderedDiGraph) and nx.is_forest(tree1)):
raise nx.NetworkXNotImplemented(
'only implemented for directed ordered trees')
if not (isinstance(tree1, nx.OrderedDiGraph) and nx.is_forest(tree2)):
raise nx.NetworkXNotImplemented(
'only implemented for directed ordered trees')
except nx.NetworkXPointlessConcept:
subtree1 = nx.OrderedDiGraph()
subtree2 = nx.OrderedDiGraph()
return subtree1, subtree2
# Convert the trees to balanced sequences
sequence1, open_to_close, toks = tree_to_seq(tree1,
open_to_close=None,
toks=None,
mode='chr')
sequence2, open_to_close, toks = tree_to_seq(tree2,
open_to_close,
toks,
mode='chr')
seq1 = sequence1
seq2 = sequence2
open_to_tok = ub.invert_dict(toks)
# Solve the longest common balanced sequence problem
best, value = longest_common_isomorphic_sequence(
seq1,
seq2,
open_to_close,
open_to_tok=open_to_tok,
node_affinity=node_affinity)
subseq1, subseq2 = best
# Convert the subsequence back into a tree
subtree1 = seq_to_tree(subseq1, open_to_close, toks)
subtree2 = seq_to_tree(subseq2, open_to_close, toks)
return subtree1, subtree2
def forest_str(graph, with_labels=True, sources=None, write=None):
"""
Creates a nice utf8 representation of a directed forest
Parameters
----------
graph : nx.DiGraph | nx.Graph
Graph to represent (must be a tree, forest, or the empty graph)
with_labels : bool
If True will use the "label" attribute of a node to display if it
exists otherwise it will use the node value itself. Defaults to True.
sources : List
Mainly relevant for undirected forests, specifies which nodes to list
first. If unspecified the root nodes of each tree will be used for
directed forests; for undirected forests this defaults to the nodes
with the smallest degree.
write : callable
Function to use to write to, if None new lines are appended to
a list and returned. If set to the `print` function, lines will
be written to stdout as they are generated. If specified,
this function will return None. Defaults to None.
Returns
-------
str | None :
utf8 representation of the tree / forest
Example
-------
>>> import networkx as nx
>>> graph = nx.balanced_tree(r=2, h=3, create_using=nx.DiGraph)
>>> print(forest_str(graph))
╙── 0
├─╼ 1
│ ├─╼ 3
│ │ ├─╼ 7
│ │ └─╼ 8
│ └─╼ 4
│ ├─╼ 9
│ └─╼ 10
└─╼ 2
├─╼ 5
│ ├─╼ 11
│ └─╼ 12
└─╼ 6
├─╼ 13
└─╼ 14
>>> graph = nx.balanced_tree(r=1, h=2, create_using=nx.Graph)
>>> print(forest_str(graph))
╙── 0
└── 1
└── 2
"""
import networkx as nx
printbuf = []
if write is None:
_write = printbuf.append
else:
_write = write
if len(graph.nodes) == 0:
_write("╙")
else:
if not nx.is_forest(graph):
raise nx.NetworkXNotImplemented(
"input must be a forest or the empty graph")
is_directed = graph.is_directed()
succ = graph.succ if is_directed else graph.adj
if sources is None:
if is_directed:
# use real source nodes for directed trees
sources = [n for n in graph.nodes if graph.in_degree[n] == 0]
else:
# use arbitrary sources for undirected trees
sources = [
min(cc, key=lambda n: graph.degree[n])
for cc in nx.connected_components(graph)
]
# Populate the stack with each source node, empty indentation, and mark
# the final node. Reverse the stack so sources are popped in the
# correct order.
last_idx = len(sources) - 1
stack = [(node, "", (idx == last_idx))
for idx, node in enumerate(sources)][::-1]
seen = set()
while stack:
node, indent, islast = stack.pop()
if node in seen:
continue
seen.add(node)
# Notes on available box and arrow characters
# https://en.wikipedia.org/wiki/Box-drawing_character
# https://stackoverflow.com/questions/2701192/triangle-arrow
if not indent:
# Top level items (i.e. trees in the forest) get different
# glyphs to indicate they are not actually connected
if islast:
this_prefix = indent + "╙── "
next_prefix = indent + " "
else:
this_prefix = indent + "╟── "
next_prefix = indent + "╎ "
else:
# For individual forests distinguish between directed and
# undirected cases
if is_directed:
if islast:
this_prefix = indent + "└─╼ "
next_prefix = indent + " "
else:
this_prefix = indent + "├─╼ "
next_prefix = indent + "│ "
else:
if islast:
this_prefix = indent + "└── "
next_prefix = indent + " "
else:
this_prefix = indent + "├── "
next_prefix = indent + "│ "
if with_labels:
label = graph.nodes[node].get("label", node)
else:
label = node
_write(this_prefix + str(label))
# Push children on the stack in reverse order so they are popped in
# the original order.
children = [child for child in succ[node] if child not in seen]
for idx, child in enumerate(children[::-1], start=1):
islast_next = idx <= 1
try_frame = (child, next_prefix, islast_next)
stack.append(try_frame)
if write is None:
# Only return a string if the custom write function was not specified
return "\n".join(printbuf)
def test_is_not_forest(self):
assert not nx.is_forest(self.N4)
assert not nx.is_forest(self.N6)
assert not nx.is_forest(self.NF1)
def test_is_forest(self):
assert nx.is_forest(self.T2)
assert nx.is_forest(self.T3)
assert nx.is_forest(self.T5)
assert nx.is_forest(self.F1)
assert nx.is_forest(self.N5)
def test_null_forest2(self):
with pytest.raises(nx.NetworkXPointlessConcept):
nx.is_forest(self.multigraph())
m = 3
import networkx as nx
trees = []
G = nx.grid_graph([m, m])
n = len(G.nodes())
sorted_edges = list(G.edges())
for i in range(5000):
edge_list = []
T = nx.Graph()
random.shuffle(sorted_edges)
i = 0
while len(T.edges()) < n - 1:
e = sorted_edges[i]
T.add_edges_from([e])
if nx.is_forest(T) == False:
T.remove_edges_from([e])
i += 1
trees.append(T)
partitions = []
for tree in trees:
for e in tree.edges():
partitions.append(R(G, tree, e))
print("now making histogram")
histogram = make_histogram(list_of_partitions, partitions)
total_variation = 0
for k in histogram.keys():
total_variation += np.abs(histogram[k] - 1 / len(list_of_partitions))
print(total_variation)
def test_is_not_forest(self):
assert_false(nx.is_forest(self.N4))
assert_false(nx.is_forest(self.N6))
assert_false(nx.is_forest(self.NF1))
def test_is_forest(self):
assert_true(nx.is_forest(self.T2))
assert_true(nx.is_forest(self.T3))
assert_true(nx.is_forest(self.T5))
assert_true(nx.is_forest(self.F1))
assert_true(nx.is_forest(self.N5))
def test_null_forest(self):
nx.is_forest(self.graph())
nx.is_forest(self.multigraph())
def test_null_forest(self):
nx.is_forest(self.graph())
nx.is_forest(self.multigraph())
def test_is_forest(self):
assert_true(nx.is_forest(self.T2))
assert_true(nx.is_forest(self.T3))
assert_true(nx.is_forest(self.T5))
assert_true(nx.is_forest(self.F1))
assert_true(nx.is_forest(self.N5))
# Part A: Analysis of Connected Components
print("The Amount of Connected Components: ",
nx.number_connected_components(ug))
ccs = [
len(c) for c in sorted(nx.connected_components(ug), key=len, reverse=True)
]
print("Largest Connected Component: ", ccs[0])
print("Smallest Connected Component: ", ccs[-1])
# Part E: Euler Network
print("Is subnetwork 1 Eularian? ", nx.is_eulerian(separate1))
print("Is subnetwork 2 Eularian? ", nx.is_eulerian(separate2))
# Part H: Minimum Spanning tree of network (ug) and largest CC (separate1)
a = nx.minimum_spanning_tree(ug)
print("Is tree?", nx.is_tree(a))
print("Is forest?", nx.is_forest(a))
separate1.remove_edge(3, 11)
b = nx.minimum_spanning_tree(separate1)
print("Removed edge from largest CC")
print("Is tree?", nx.is_tree(b))
print("Is forest?", nx.is_forest(b))
flName = 'moreno_highschool\README.moreno_highschool'
f = open(flName, 'r')
lines = f.readlines()
print('###################################################################')
print('############### Directed weighted network: README #################')
print('###################################################################')
## Reading the data
flName = 'moreno_highschool\out.moreno_highschool_highschool'
def test_digraph_forest(self):
assert_false(nx.is_forest(self.N1))