def test_dijkstra():
'''
Test `dijkstra` function.
This is an implementation of dijkstra's algorithm
for finding shortest path distances to all nodes
in a graph from a specified start node.
'''
G = make_graph('test_data/undirected.txt')
expected = {'A': 0, 'C': 3, 'B': 1, 'D': 4}
dist, pred = dijkstra(G, 'A')
assert dist == expected
G = make_graph('test_data/directed.txt')
dist, pred = dijkstra(G, 'A')
assert dist == expected
graph = {'a': {'b': 1},
'b': {'c': 2, 'b': 5},
'c': {'d': 1},
'd': {}}
dist, pred = dijkstra(graph, start='a')
assert dist == {'a': 0, 'c': 3, 'b': 1, 'd': 4}
assert pred == {'b': 'a', 'c': 'b', 'd': 'c'}
def __init__(self, data, width, height, targets):
self.mat = np.array(data, dtype="int32").reshape(height, width)
self.potentials = {}
graph, nodes = make_graph(self)
self.pathfinding = Dijkstra(graph, nodes)
self.generate_potential_for_targets(targets)
def test_make_graph():
'''
Test `make_graph` function.
'''
G = make_graph('test_data/undirected.txt')
assert G['A']['B'] == 1
assert G['B']['A'] == 1
assert G['A']['C'] == 5
assert G['C']['A'] == 5
assert_raises(KeyError, G['A'].__getitem__, 'D')
assert_raises(KeyError, G['D'].__getitem__, 'A')
G = make_graph('test_data/directed.txt')
assert G['A']['B'] == 1
assert G['A']['C'] == 5
assert G['B']['C'] == 2
assert_raises(KeyError, G['B'].__getitem__, 'A')
def test_make_graph():
'''
Test `make_graph` function.
'''
G = make_graph('test_data/undirected.txt')
assert G['A']['B'] == 1
assert G['B']['A'] == 1
assert G['A']['C'] == 5
assert G['C']['A'] == 5
assert_raises(KeyError, G['A'].__getitem__, 'D')
assert_raises(KeyError, G['D'].__getitem__, 'A')
G = make_graph('test_data/directed.txt')
assert G['A']['B'] == 1
assert G['A']['C'] == 5
assert G['B']['C'] == 2
assert_raises(KeyError, G['B'].__getitem__, 'A')
def test_dijkstra():
'''
Test `dijkstra` function.
This is an implementation of dijkstra's algorithm
for finding shortest path distances to all nodes
in a graph from a specified start node.
'''
G = make_graph('test_data/undirected.txt')
expected = {'A': 0, 'C': 3, 'B': 1, 'D': 4}
dist, pred = dijkstra(G, 'A')
assert dist == expected
G = make_graph('test_data/directed.txt')
dist, pred = dijkstra(G, 'A')
assert dist == expected
graph = {'a': {'b': 1}, 'b': {'c': 2, 'b': 5}, 'c': {'d': 1}, 'd': {}}
dist, pred = dijkstra(graph, start='a')
assert dist == {'a': 0, 'c': 3, 'b': 1, 'd': 4}
assert pred == {'b': 'a', 'c': 'b', 'd': 'c'}
def test_answer():
'''
Get the shortest-path distances to the following ten vertices
from the graph specified in `test/data.txt`, in order:
7,37,59,82,99,115,133,165,188,197.
Returns a comma-separated string of integers containing the results
for each vertex in the specified order.
'''
G = make_graph('test_data/data.txt')
dist, pred = dijkstra(G, '1')
ends = [7, 37, 59, 82, 99, 115, 133, 165, 188, 197] # ending vertices
results = [str(dist[str(x)]) for x in ends]
answer = ','.join(results)
expected = '2599,2610,2947,2052,2367,2399,2029,2442,2505,3068'
assert answer == expected
def test_answer():
'''
Get the shortest-path distances to the following ten vertices
from the graph specified in `test/data.txt`, in order:
7,37,59,82,99,115,133,165,188,197.
Returns a comma-separated string of integers containing the results
for each vertex in the specified order.
'''
G = make_graph('test_data/data.txt')
dist, pred = dijkstra(G, '1')
ends = [7, 37, 59, 82, 99, 115, 133, 165, 188, 197] # ending vertices
results = [str(dist[str(x)]) for x in ends]
answer = ','.join(results)
expected = '2599,2610,2947,2052,2367,2399,2029,2442,2505,3068'
assert answer == expected
}
assert shortest_path(graph, 'a', 'e') == ['a', 'c', 'b', 'e']
def test_answer():
'''
Get the shortest-path distances to the following ten vertices
from the graph specified in `test/data.txt`, in order:
7,37,59,82,99,115,133,165,188,197.
Returns a comma-separated string of integers containing the results
for each vertex in the specified order.
'''
G = make_graph('test_data/data.txt')
dist, pred = dijkstra(G, '1')
ends = [7, 37, 59, 82, 99, 115, 133, 165, 188, 197] # ending vertices
results = [str(dist[str(x)]) for x in ends]
answer = ','.join(results)
expected = '2599,2610,2947,2052,2367,2399,2029,2442,2505,3068'
assert answer == expected
G = make_graph('test_data/data.txt')
g = nx.DiGraph()
#add nodes
g.add_nodes_from(list(G.keys()))
#add edges
nx.draw()
plt.show()