def has_no_cycle(chain: Chain):
graph, _ = chain_as_nx_graph(chain)
cycled = list(simple_cycles(graph))
if len(cycled) > 0:
raise ValueError(f'{ERROR_PREFIX} Chain has cycles')
return True
def main():
filename = '/home/ankursarda/Projects/graph-analytics/networkx/data/sample_data4.adj' #sys.argv[1]
g = ds.getDirectedData(filename)
try:
res = cyc.simple_cycles(g)
print(list(res))
except nx.exception.NetworkXNoCycle:
print("[]")
def cndp_abstract(ndp):
from .connection import get_connection_multigraph
G = get_connection_multigraph(ndp.get_connections())
cycles = list(simple_cycles(G))
if len(cycles) > 0:
logger.debug('cndp_abstract: %d cycles' % len(cycles))
if not cycles:
return dpgraph_making_sure_no_reps(ndp.context)
else:
return cndp_abstract_loop2(ndp)
def cndp_abstract(ndp):
from .connection import get_connection_multigraph
G = get_connection_multigraph(ndp.get_connections())
cycles = list(simple_cycles(G))
if len(cycles) > 0:
logger.debug('cndp_abstract: %d cycles' % len(cycles))
if not cycles:
return dpgraph_making_sure_no_reps(ndp.context)
else:
return cndp_abstract_loop2(ndp)
def would_introduce_cycle(context, f, r):
if f.dp == r.dp:
return True
from mocdp.comp.connection import get_connection_multigraph
from networkx.algorithms.cycles import simple_cycles
connections1 = list(context.connections)
con = Connection(r.dp, r.s, f.dp, f.s)
connections2 = connections1 + [con]
G1 = get_connection_multigraph(connections1)
G2 = get_connection_multigraph(connections2)
cycles1 = list(simple_cycles(G1))
cycles2 = list(simple_cycles(G2))
c1 = len(cycles1)
c2 = len(cycles2)
# if c1 != c2:
# print G2.edges()
# print('c1: %s' % cycles1)
# print('c2: %s' % cycles2)
return c1 != c2
def would_introduce_cycle(context, f, r):
if f.dp == r.dp:
return True
from mocdp.comp.connection import get_connection_multigraph
from networkx.algorithms.cycles import simple_cycles
connections1 = list(context.connections)
con = Connection(r.dp, r.s, f.dp, f.s)
connections2 = connections1 + [con]
G1 = get_connection_multigraph(connections1)
G2 = get_connection_multigraph(connections2)
cycles1 = list(simple_cycles(G1))
cycles2 = list(simple_cycles(G2))
c1 = len(cycles1)
c2 = len(cycles2)
# if c1 != c2:
# print G2.edges()
# print('c1: %s' % cycles1)
# print('c2: %s' % cycles2)
return c1 != c2
def render_graph():
global nodes_count
global matrix
i = 0
g = nx.DiGraph()
for node in range(nodes_count):
g.add_node(node)
for element in matrix:
if element == 1 and i // nodes_count != i % nodes_count:
g.add_edge(i // nodes_count, i % nodes_count)
i += 1
cycles = list(simple_cycles(g))
print(cycles)
for cycle in cycles:
cycle = "-".join(str(e) for e in cycle)
ttk.Label(root, text=f"{cycle}").grid()
def _recalc(self):
"""
Обходит граф, считая максимальные длины путей в центральную вершину и
из неё.
"""
path_down = nx.single_source_shortest_path_length(self.nx_graph, self.pov_id)
path_up = dict(nx.single_target_shortest_path_length(self.nx_graph, self.pov_id))
self.levels_down = max([length for length in path_down.values()])
self.levels_up = max([length for length in path_up.values()])
# поиск вершин без потомков
for node in self.nx_graph.node:
self.nx_graph.node[node]["is_blind"] = (not list(self.nx_graph.successors(node)))
# поиск циклов, проходящих через точку отсчёта
cycles = simple_cycles(self.nx_graph)
cycles = list(filter(lambda cycle: self.pov_id in cycle, cycles))
for node in set([node for cycle in cycles for node in cycle]):
self[node]["in_cycle"] = True
def statistics(graph, reduce=True, verb=True):
stats = dict()
# perform transitive reduction
if reduce:
from networkx.algorithms.dag import transitive_reduction
reduced = transitive_reduction(graph)
stats['reduced'] = reduced
# git the extra edges that we honestly don't need
superfluous_edges = graph.edges() - reduced.edges()
stats['superfluous_edges'] = superfluous_edges
# if verb:
# print(superfluous_edges)
else:
stats['reduced'] = graph
# find any cycles
from networkx.algorithms.cycles import simple_cycles
cycles = list(simple_cycles(stats['reduced']))
if verb and len(cycles) > 0:
print("Found {0} cycles".format(len(cycles)))
elif verb:
print("Graph is cycle-free")
stats['cycles'] = cycles
# calculate connected components
# from networkx.algorithms.components import connected_components
components = list(nx.weakly_connected_components(stats['reduced']))
if verb:
print("{0} connected component{1}".format(
len(components), "" if len(components) == 1 else "s"))
stats['components'] = components
# return all the stats we calclulated
return stats
def _find_cycles(g):
# XXX this function needs some serious refactoring
# (duplicated fragments of code, cryptic variables' names etc.)
C = []
cycle = []
a = {node: g.successors(node) for node in g.nodes()}
# removing self-loops (we may also try g.nodes_with_selfloops)
for k, v in a.iteritems():
if k in v:
v.remove(k)
len_old = len(a)
while len(a) > 0:
empty_rows = []
nodes_to_remove = []
for node, succ in a.iteritems():
# if there are no successors
if len(succ) == 0:
# mark this node for removal
empty_rows.append(node)
# and traverse remaining lists of successors
for i, j in a.iteritems():
# looking for previously marked node
if node in j:
nodes_to_remove.append((i, node))
# actual nodes removal (maybe dict's viewitems would here?)
# 'l' == (row, index to remove)
for l in nodes_to_remove:
a[l[0]].remove(l[1])
for l in empty_rows:
a.pop(l)
# if we run out of nodes to remove, then stop
if len(a) == len_old:
break
else:
len_old = len(a)
# if there are cycles
if len(a) > 0:
# check if sequence of removed indices creates a cycle
cycles = filter(lambda x: len(x) > 1, [set(c) for c in simple_cycles(g)])
# pick arbitrary row/element for removal (e.g. first one)
len_old = len(a)
while True:
# check if any combination of C's elements creates cycle
if len(C) > 1:
c = []
for m in range(2, len(C) + 1):
c += [comb for comb in it.combinations(C, m)]
for n in c:
if set(n) in cycles:
cycle = list(n)
break
if cycle:
break
empty_rows = []
nodes_to_remove = []
# if we've just started or there are no changes
if len(a) == len_old:
if len(a) == 1:
# this shouldn't happen
return []
# take the first element and remove it
a.items()[0][1].pop()
# check for empty rows and remove them
for node, succ in a.iteritems():
if len(succ) == 0:
empty_rows.append(node)
for i, j in a.iteritems():
if node in j:
nodes_to_remove.append((i, node))
for l in nodes_to_remove:
a[l[0]].remove(l[1])
for l in empty_rows:
C.append(l)
a.pop(l)
len_old = len(a)
return cycle
def is_recursive_predicate(self, predicate_name):
for cyclic_predicates in simple_cycles(
self.get_predicate_deps_graph()):
if predicate_name in cyclic_predicates:
return True
return False
def cndp_makecanonical(ndp, name_inner_muxed='_inner_muxed', s_muxed='_muxed'):
"""
Returns a composite with only one ndp, called <named_inner_muxed>.
If there were cycles, then this will also have a signal caled s_muxed
and there will be one connection to it.
raises DPSemanticErrorNotConnected
"""
assert isinstance(ndp, CompositeNamedDP), type(ndp)
try:
ndp.check_fully_connected()
except NotConnected as e:
msg = 'Cannot put in canonical form because not all subproblems are connected.'
raise_wrapped(DPSemanticErrorNotConnected, e, msg, compact=True)
fnames = ndp.get_fnames()
rnames = ndp.get_rnames()
# First, we flatten it
ndp = cndp_flatten(ndp)
assert ndp.get_fnames() == fnames
assert ndp.get_rnames() == rnames
# then we compact it (take the product of edges)
# Note also that this abstract() the children;
# however, because we flattened before, this is redundant,
# as every DP is a SimpleDP
ndp = ndp.compact()
assert ndp.get_fnames() == fnames
assert ndp.get_rnames() == rnames
# Check that we have some cycles
G = get_connection_multigraph(ndp.get_connections())
cycles = list(simple_cycles(G))
if not cycles:
ndp_inner = ndp
cycles_names = []
else:
# then we choose which edges to remove
connections_to_cut = choose_connections_to_cut(
connections=ndp.get_connections(), name2dp=ndp.get_name2ndp())
connections_to_cut = list(connections_to_cut)
n = len(connections_to_cut)
cycles_names = list(['cut%d' % _ for _ in range(n)])
ndp_inner = cndp_create_one_without_some_connections(
ndp, connections_to_cut, cycles_names)
assert ndp_inner.get_fnames() == fnames + cycles_names
assert ndp_inner.get_rnames() == rnames + cycles_names
if cycles_names:
ndp_inner_muxed = add_muxes(ndp_inner,
cs=cycles_names,
s_muxed=s_muxed)
mux_signal = s_muxed
assert ndp_inner_muxed.get_fnames() == fnames + [mux_signal]
assert ndp_inner_muxed.get_rnames() == rnames + [mux_signal]
else:
ndp_inner_muxed = ndp_inner
name2ndp = {}
name2ndp[name_inner_muxed] = ndp_inner_muxed
connections = []
connect_functions_to_outside(name2ndp,
connections,
ndp_name=name_inner_muxed,
fnames=fnames)
connect_resources_to_outside(name2ndp,
connections,
ndp_name=name_inner_muxed,
rnames=rnames)
if cycles_names:
connections.append(
Connection(name_inner_muxed, mux_signal, name_inner_muxed,
mux_signal))
outer = CompositeNamedDP.from_parts(name2ndp=name2ndp,
connections=connections,
fnames=fnames,
rnames=rnames)
return outer
def clone_combinatorial(
record_set: List[SeqRecord],
enzymes: List[RestrictionType],
include: List[str] = None,
min_count: int = -1,
linear: bool = True,
) -> List[Tuple[List[SeqRecord], List[SeqRecord]]]:
"""Parse a single list of SeqRecords to find all circularizable plasmids.
Turn each SeqRecord's post-digest seqs into a graph where the nodes are
the overhangs and the edges are the linear fragments
post-digest/catalyzing with BsaI/BpiI.
Args:
record_set: single record set that might circularize
enzymes: list of enzymes to digest the input records with
Keyword Args:
include: the include to filter assemblies
min_count: mininum number of SeqRecords for an assembly to be considered
linear: Whether the individual SeqRecords are assumed to be linear
Returns:
A list of tuples with:
1. plasmids that will form
2. SeqRecords that went into each formed plasmid
"""
graph = nx.MultiDiGraph()
seen_seqs: Set[str] = set(
) # stored list of input seqs (not new combinations)
for record in record_set:
seen_seqs.add(str(record.seq + record.seq).upper())
seen_seqs.add(
str((record.seq + record.seq).reverse_complement().upper()))
for left, frag, right in _catalyze(record, enzymes, linear):
graph.add_node(left)
graph.add_node(right)
graph.add_edge(left, right, frag=frag)
try: # find all circularizable cycles
cycles = simple_cycles(graph)
except NetworkXNoCycle:
return []
# get the fragments, enzymes back out of the cycle
ids_to_fragments: Dict[str, List[SeqRecord]] = defaultdict(list)
ids_to_plasmids: Dict[str, List[SeqRecord]] = defaultdict(list)
for cycle in cycles:
# filter for the minimum number of SeqRecords
if min_count > 0 and len(cycle) < min_count:
continue
combinations = CombinatorialBins()
for i, overhang in enumerate(cycle):
next_overhang = cycle[(i + 1) % len(cycle)]
record_bin = []
for out_edge in graph.out_edges(keys=True):
src, dest, index = out_edge
if src != overhang or dest != next_overhang:
continue
record_bin.append(graph.edges[src, dest, index]["frag"])
combinations.append(record_bin)
for fragments in combinations:
# create the composite plasmid
plasmid = SeqRecord(Seq("", IUPACUnambiguousDNA()))
for fragment in fragments:
plasmid += fragment.upper()
# make sure it's not just a re-ligation of insert + backbone
plasmid_seq = str(plasmid.seq)
if any(plasmid_seq in seq for seq in seen_seqs):
continue
# filter for plasmids that have an 'include' feature
if not _has_features(plasmid, include):
continue
# re-order the fragments to try and match the input order
fragments = _reorder_fragments(record_set, fragments)
seen_seqs.add(str(plasmid.seq + plasmid.seq))
seen_seqs.add(str(
(plasmid.seq + plasmid.seq).reverse_complement()))
# make a unique id for the fragments
fragments_id = _hash_fragments(fragments)
ids_to_fragments[fragments_id] = fragments
ids_to_plasmids[fragments_id].append(plasmid)
plasmids_and_fragments: List[Tuple[List[SeqRecord], List[SeqRecord]]] = []
for ids, fragments in ids_to_fragments.items():
plasmids = ids_to_plasmids[ids]
for i, plasmid in enumerate(plasmids):
plasmid.id = "+".join(f.id for f in fragments
if f.id != "<unknown id>")
plasmid.description = f"cloned from {', '.join(str(e) for e in enzymes)}"
if len(plasmids) > 1:
plasmid.id += f"({i + 1})"
plasmids_and_fragments.append((plasmids, fragments))
return plasmids_and_fragments
def cndp_makecanonical(ndp, name_inner_muxed="_inner_muxed", s_muxed="_muxed"):
"""
Returns a composite with only one ndp, called <named_inner_muxed>.
If there were cycles, then this will also have a signal caled s_muxed
and there will be one connection to it.
raises DPSemanticErrorNotConnected
"""
assert isinstance(ndp, CompositeNamedDP), type(ndp)
try:
ndp.check_fully_connected()
except NotConnected as e:
msg = "Cannot put in canonical form because not all subproblems are connected."
raise_wrapped(DPSemanticErrorNotConnected, e, msg, compact=True)
fnames = ndp.get_fnames()
rnames = ndp.get_rnames()
# First, we flatten it
ndp = cndp_flatten(ndp)
assert ndp.get_fnames() == fnames
assert ndp.get_rnames() == rnames
# then we compact it (take the product of edges)
# Note also that this abstract() the children;
# however, because we flattened before, this is redundant,
# as every DP is a SimpleDP
ndp = ndp.compact()
assert ndp.get_fnames() == fnames
assert ndp.get_rnames() == rnames
# Check that we have some cycles
G = get_connection_multigraph(ndp.get_connections())
cycles = list(simple_cycles(G))
if not cycles:
ndp_inner = ndp
cycles_names = []
else:
# then we choose which edges to remove
connections_to_cut = choose_connections_to_cut(connections=ndp.get_connections(), name2dp=ndp.get_name2ndp())
connections_to_cut = list(connections_to_cut)
n = len(connections_to_cut)
cycles_names = list(["cut%d" % _ for _ in range(n)])
ndp_inner = cndp_create_one_without_some_connections(ndp, connections_to_cut, cycles_names)
assert ndp_inner.get_fnames() == fnames + cycles_names
assert ndp_inner.get_rnames() == rnames + cycles_names
if cycles_names:
ndp_inner_muxed = add_muxes(ndp_inner, cs=cycles_names, s_muxed=s_muxed)
mux_signal = s_muxed
assert ndp_inner_muxed.get_fnames() == fnames + [mux_signal]
assert ndp_inner_muxed.get_rnames() == rnames + [mux_signal]
else:
ndp_inner_muxed = ndp_inner
name2ndp = {}
name2ndp[name_inner_muxed] = ndp_inner_muxed
connections = []
connect_functions_to_outside(name2ndp, connections, ndp_name=name_inner_muxed, fnames=fnames)
connect_resources_to_outside(name2ndp, connections, ndp_name=name_inner_muxed, rnames=rnames)
if cycles_names:
connections.append(Connection(name_inner_muxed, mux_signal, name_inner_muxed, mux_signal))
outer = CompositeNamedDP.from_parts(name2ndp=name2ndp, connections=connections, fnames=fnames, rnames=rnames)
return outer