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from opencamlib import ocl
import time
import gzip
import csv
def TSPLIBReader( filename ):
""" read a .tsp format TSPLIB file, and return list of points """
#infile = open(filename,"r")
infile = gzip.open(filename, 'rb')
points = []
found = 0
n = 1
for line in infile.readlines():
if not found:
for word in line.split():
if word == "NODE_COORD_SECTION":
found = 1
else:
words = line.split()
if len(words)!=0 and words[0]!="EOF" :
points.append( ocl.Point( float( words[1] ), float( words[2] ) ) )
print("read ",len(points)," points from ", filename)
return points
if __name__ == "__main__":
tsplist = [ ["a280" , 2579 ],
["berlin52" , 7542 ],
["bier127" , 118282 ],
["brd14051" , 469385 ],
["ch130" , 6110 ],
["ch150" , 6528 ],
["d198" , 15780 ],
["d493" , 35002 ],
["d657" , 48912 ],
["d1291" , 50801],
["d1655" , 62128],
["d2103" , 80450],
["d15112" , 1573084],
["d18512" , 645238],
["eil51" , 426 ],
["eil76" , 538 ],
["eil101" , 629 ],
["fl417" , 11861 ],
["fl1400" , 20127 ],
["fl1577" , 22249 ],
["fl3795" , 28772 ],
["fnl4461" , 182566 ],
["gil262" , 2378 ],
["kroA100" , 21282 ],
["kroB100" , 22141],
["kroC100" , 20749],
["kroD100" , 21294],
["kroE100" , 22068],
["kroA150" , 26524],
["kroB150" , 26130],
["kroA200" , 29368],
["kroB200" , 29437],
["lin105" , 14379],
["lin318" , 42029],
["linhp318" , 41345],
["nrw1379" , 56638],
["p654" , 34643],
["pcb442" , 50778],
["pcb1173" , 56892],
["pcb3038" , 137694],
["pr76" , 108159],
["pr107" , 44303],
["pr124" , 59030],
["pr136" , 96772],
["pr144" , 58537],
["pr152" , 73682],
["pr226" , 80369],
["pr264" , 49135],
["pr299" , 48191],
["pr439" , 107217],
["pr1002" , 259045],
["pr2392" , 378032],
["rat99" , 1211] ,
["rat195" , 2323],
["rat575" , 6773],
["rat783" , 8806],
["rd100" , 7910],
["rd400" , 15281],
["rl1304" , 252948],
["rl1323" , 270199],
["rl1889" , 316536],
["rl5915" , 565530], # 22 s
["rl5934" , 556045], # 22 s
["rl11849" , 923288], # 93 s
["st70" , 675],
["ts225" , 126643],
["tsp225" , 3916],
["u159" , 42080],
["u574" , 36905],
["u724" , 41910],
["u1060" , 224094],
["u1432" , 152970],
["u1817" , 57201],
["u2152" , 64253],
["u2319" , 234256],
["vm1084" , 239297],
["usa13509" , 19982859],
["vm1748" , 336556]
]
tsplist2=[]
for t in tsplist:
tspname = t[0]
tspfile = "tsplib/"+tspname+".tsp.gz"
pts = TSPLIBReader( tspfile )
inst=[]
inst.append(len(pts)) # length
inst.append(t[0]) # name
inst.append(t[1]) # optimal
inst.append(pts) # points
tsplist2.append(inst)
tsp_sorted = sorted(tsplist2)
Nmax=65 #60(1577) 65(2103)
results=[]
#for n in range(0,Nmax): # len(tsp_sorted)):
for n in range(0, len(tsp_sorted)):
resultrow=[]
tsp = ocl.TSPSolver()
inst = tsp_sorted[n]
for p in inst[3]:
tsp.addPoint( p.x , p.y)
start_time = time.time()
tsp.run()
run_time = time.time() - start_time
l = tsp.getLength()
ratio = float(l)/float(inst[2])
print(n," : ",inst[1],": ",ratio," l=",l," / ",inst[2], " / ",run_time, "seconds")
resultrow.append( inst[0] ) # length
resultrow.append( inst[2] ) # optimal
resultrow.append( l ) # found tour length
resultrow.append( ratio ) # found tour length
resultrow.append( run_time )
results.append(resultrow)
# write time and length results to file
writer = csv.writer(open('tsp_results.csv', 'wb'), delimiter=',',quotechar='|', quoting=csv.QUOTE_MINIMAL)
for row in results:
writer.writerow( row )
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