#!/usr/bin/env python
import os, sys, traceback
import getpass
from threading import Thread
from subprocess import *
if(sys.hexversion < 0x03000000):
import Queue
else:
import queue as Queue
# svmtrain and gnuplot executable
is_win32 = (sys.platform == 'win32')
if not is_win32:
svmtrain_exe = "../svm-train"
gnuplot_exe = "/usr/bin/gnuplot"
else:
# example for windows
svmtrain_exe = r"..\windows\svm-train.exe"
# svmtrain_exe = r"c:\Program Files\libsvm\windows\svm-train.exe"
gnuplot_exe = r"c:\tmp\gnuplot\binary\pgnuplot.exe"
# global parameters and their default values
fold = 5
c_begin, c_end, c_step = -5, 15, 2
g_begin, g_end, g_step = 3, -15, -2
global dataset_pathname, dataset_title, pass_through_string
global out_filename, png_filename
# experimental
telnet_workers = []
ssh_workers = []
nr_local_worker = 1
# process command line options, set global parameters
def process_options(argv=sys.argv):
global fold
global c_begin, c_end, c_step
global g_begin, g_end, g_step
global dataset_pathname, dataset_title, pass_through_string
global svmtrain_exe, gnuplot_exe, gnuplot, out_filename, png_filename
usage = """\
Usage: grid.py [-log2c begin,end,step] [-log2g begin,end,step] [-v fold]
[-svmtrain pathname] [-gnuplot pathname] [-out pathname] [-png pathname]
[additional parameters for svm-train] dataset"""
if len(argv) < 2:
print(usage)
sys.exit(1)
dataset_pathname = argv[-1]
dataset_title = os.path.split(dataset_pathname)[1]
out_filename = '{0}.out'.format(dataset_title)
png_filename = '{0}.png'.format(dataset_title)
pass_through_options = []
i = 1
while i < len(argv) - 1:
if argv[i] == "-log2c":
i = i + 1
(c_begin,c_end,c_step) = map(float,argv[i].split(","))
elif argv[i] == "-log2g":
i = i + 1
(g_begin,g_end,g_step) = map(float,argv[i].split(","))
elif argv[i] == "-v":
i = i + 1
fold = argv[i]
elif argv[i] in ('-c','-g'):
print("Option -c and -g are renamed.")
print(usage)
sys.exit(1)
elif argv[i] == '-svmtrain':
i = i + 1
svmtrain_exe = argv[i]
elif argv[i] == '-gnuplot':
i = i + 1
gnuplot_exe = argv[i]
elif argv[i] == '-out':
i = i + 1
out_filename = argv[i]
elif argv[i] == '-png':
i = i + 1
png_filename = argv[i]
else:
pass_through_options.append(argv[i])
i = i + 1
pass_through_string = " ".join(pass_through_options)
assert os.path.exists(svmtrain_exe),"svm-train executable not found"
assert os.path.exists(gnuplot_exe),"gnuplot executable not found"
assert os.path.exists(dataset_pathname),"dataset not found"
gnuplot = Popen(gnuplot_exe,stdin = PIPE).stdin
def range_f(begin,end,step):
# like range, but works on non-integer too
seq = []
while True:
if step > 0 and begin > end: break
if step < 0 and begin < end: break
seq.append(begin)
begin = begin + step
return seq
def permute_sequence(seq):
n = len(seq)
if n <= 1: return seq
mid = int(n/2)
left = permute_sequence(seq[:mid])
right = permute_sequence(seq[mid+1:])
ret = [seq[mid]]
while left or right:
if left: ret.append(left.pop(0))
if right: ret.append(right.pop(0))
return ret
def redraw(db,best_param,tofile=False):
if len(db) == 0: return
begin_level = round(max(x[2] for x in db)) - 3
step_size = 0.5
best_log2c,best_log2g,best_rate = best_param
# if newly obtained c, g, or cv values are the same,
# then stop redrawing the contour.
if all(x[0] == db[0][0] for x in db): return
if all(x[1] == db[0][1] for x in db): return
if all(x[2] == db[0][2] for x in db): return
if tofile:
gnuplot.write(b"set term png transparent small linewidth 2 medium enhanced\n")
gnuplot.write("set output \"{0}\"\n".format(png_filename.replace('\\','\\\\')).encode())
#gnuplot.write(b"set term postscript color solid\n")
#gnuplot.write("set output \"{0}.ps\"\n".format(dataset_title).encode().encode())
elif is_win32:
gnuplot.write(b"set term windows\n")
else:
gnuplot.write( b"set term x11\n")
gnuplot.write(b"set xlabel \"log2(C)\"\n")
gnuplot.write(b"set ylabel \"log2(gamma)\"\n")
gnuplot.write("set xrange [{0}:{1}]\n".format(c_begin,c_end).encode())
gnuplot.write("set yrange [{0}:{1}]\n".format(g_begin,g_end).encode())
gnuplot.write(b"set contour\n")
gnuplot.write("set cntrparam levels incremental {0},{1},100\n".format(begin_level,step_size).encode())
gnuplot.write(b"unset surface\n")
gnuplot.write(b"unset ztics\n")
gnuplot.write(b"set view 0,0\n")
gnuplot.write("set title \"{0}\"\n".format(dataset_title).encode())
gnuplot.write(b"unset label\n")
gnuplot.write("set label \"Best log2(C) = {0} log2(gamma) = {1} accuracy = {2}%\" \
at screen 0.5,0.85 center\n". \
format(best_log2c, best_log2g, best_rate).encode())
gnuplot.write("set label \"C = {0} gamma = {1}\""
" at screen 0.5,0.8 center\n".format(2**best_log2c, 2**best_log2g).encode())
gnuplot.write(b"set key at screen 0.9,0.9\n")
gnuplot.write(b"splot \"-\" with lines\n")
db.sort(key = lambda x:(x[0], -x[1]))
prevc = db[0][0]
for line in db:
if prevc != line[0]:
gnuplot.write(b"\n")
prevc = line[0]
gnuplot.write("{0[0]} {0[1]} {0[2]}\n".format(line).encode())
gnuplot.write(b"e\n")
gnuplot.write(b"\n") # force gnuplot back to prompt when term set failure
gnuplot.flush()
def calculate_jobs():
c_seq = permute_sequence(range_f(c_begin,c_end,c_step))
g_seq = permute_sequence(range_f(g_begin,g_end,g_step))
nr_c = float(len(c_seq))
nr_g = float(len(g_seq))
i = 0
j = 0
jobs = []
while i < nr_c or j < nr_g:
if i/nr_c < j/nr_g:
# increase C resolution
line = []
for k in range(0,j):
line.append((c_seq[i],g_seq[k]))
i = i + 1
jobs.append(line)
else:
# increase g resolution
line = []
for k in range(0,i):
line.append((c_seq[k],g_seq[j]))
j = j + 1
jobs.append(line)
return jobs
class WorkerStopToken: # used to notify the worker to stop
pass
class Worker(Thread):
def __init__(self,name,job_queue,result_queue):
Thread.__init__(self)
self.name = name
self.job_queue = job_queue
self.result_queue = result_queue
def run(self):
while True:
(cexp,gexp) = self.job_queue.get()
if cexp is WorkerStopToken:
self.job_queue.put((cexp,gexp))
# print('worker {0} stop.'.format(self.name))
break
try:
rate = self.run_one(2.0**cexp,2.0**gexp)
if rate is None: raise RuntimeError("get no rate")
except:
# we failed, let others do that and we just quit
traceback.print_exception(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2])
self.job_queue.put((cexp,gexp))
print('worker {0} quit.'.format(self.name))
break
else:
self.result_queue.put((self.name,cexp,gexp,rate))
class LocalWorker(Worker):
def run_one(self,c,g):
cmdline = '{0} -c {1} -g {2} -v {3} {4} {5}'.format \
(svmtrain_exe,c,g,fold,pass_through_string,dataset_pathname)
result = Popen(cmdline,shell=True,stdout=PIPE).stdout
for line in result.readlines():
if str(line).find("Cross") != -1:
return float(line.split()[-1][0:-1])
class SSHWorker(Worker):
def __init__(self,name,job_queue,result_queue,host):
Worker.__init__(self,name,job_queue,result_queue)
self.host = host
self.cwd = os.getcwd()
def run_one(self,c,g):
cmdline = 'ssh -x {0} "cd {1}; {2} -c {3} -g {4} -v {5} {6} {7}"'.format \
(self.host,self.cwd, \
svmtrain_exe,c,g,fold,pass_through_string,dataset_pathname)
result = Popen(cmdline,shell=True,stdout=PIPE).stdout
for line in result.readlines():
if str(line).find("Cross") != -1:
return float(line.split()[-1][0:-1])
class TelnetWorker(Worker):
def __init__(self,name,job_queue,result_queue,host,username,password):
Worker.__init__(self,name,job_queue,result_queue)
self.host = host
self.username = username
self.password = password
def run(self):
import telnetlib
self.tn = tn = telnetlib.Telnet(self.host)
tn.read_until("login: ")
tn.write(self.username + "\n")
tn.read_until("Password: ")
tn.write(self.password + "\n")
# XXX: how to know whether login is successful?
tn.read_until(self.username)
#
print('login ok', self.host)
tn.write("cd "+os.getcwd()+"\n")
Worker.run(self)
tn.write("exit\n")
def run_one(self,c,g):
cmdline = '{0} -c {1} -g {2} -v {3} {4} {5}'.format \
(svmtrain_exe,c,g,fold,pass_through_string,dataset_pathname)
result = self.tn.write(cmdline+'\n')
(idx,matchm,output) = self.tn.expect(['Cross.*\n'])
for line in output.split('\n'):
if str(line).find("Cross") != -1:
return float(line.split()[-1][0:-1])
def main():
# set parameters
process_options()
# put jobs in queue
jobs = calculate_jobs()
job_queue = Queue.Queue(0)
result_queue = Queue.Queue(0)
for line in jobs:
for (c,g) in line:
job_queue.put((c,g))
# hack the queue to become a stack --
# this is important when some thread
# failed and re-put a job. It we still
# use FIFO, the job will be put
# into the end of the queue, and the graph
# will only be updated in the end
job_queue._put = job_queue.queue.appendleft
# fire telnet workers
if telnet_workers:
nr_telnet_worker = len(telnet_workers)
username = getpass.getuser()
password = getpass.getpass()
for host in telnet_workers:
TelnetWorker(host,job_queue,result_queue,
host,username,password).start()
# fire ssh workers
if ssh_workers:
for host in ssh_workers:
SSHWorker(host,job_queue,result_queue,host).start()
# fire local workers
for i in range(nr_local_worker):
LocalWorker('local',job_queue,result_queue).start()
# gather results
done_jobs = {}
result_file = open(out_filename, 'w')
db = []
best_rate = -1
best_c1,best_g1 = None,None
for line in jobs:
for (c,g) in line:
while (c, g) not in done_jobs:
(worker,c1,g1,rate) = result_queue.get()
done_jobs[(c1,g1)] = rate
result_file.write('{0} {1} {2}\n'.format(c1,g1,rate))
result_file.flush()
if (rate > best_rate) or (rate==best_rate and g1==best_g1 and c1<best_c1):
best_rate = rate
best_c1,best_g1=c1,g1
best_c = 2.0**c1
best_g = 2.0**g1
print("[{0}] {1} {2} {3} (best c={4}, g={5}, rate={6})".format \
(worker,c1,g1,rate, best_c, best_g, best_rate))
db.append((c,g,done_jobs[(c,g)]))
redraw(db,[best_c1, best_g1, best_rate])
redraw(db,[best_c1, best_g1, best_rate],True)
job_queue.put((WorkerStopToken,None))
print("{0} {1} {2}".format(best_c, best_g, best_rate))
main()