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December 6, 2018 12:14
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optunaを使って他プログラムのパラメータを最適化する
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#!/usr/bin/python | |
# coding: UTF-8 | |
# 実行ファイルはコマンドライン引数としてパラメータを受け取り,目的関数値のみを標準出力に出力するものとする | |
# $ ./a.out 1.2 10 | |
# 42 | |
# configファイルには | |
# [varname] [vartype] [range] | |
# を書いておく | |
# 例えばコマンドライン引数としてdouble x ( 0 <= x <= 1.5 ),int n ( 1 <= n <= 100 )を受け取るプログラム(実行ファイル:a.out)なら | |
# config.txt: | |
# | |
# x uniform 0 1.5 | |
# n int 1 100 | |
# | |
# のように書いて, | |
# python opt.py config.txt ./a.out | |
# とすれば最適化してくれる | |
import subprocess | |
import sys | |
import optuna | |
def res_cmd(cmd): | |
return subprocess.Popen(cmd, stdout=subprocess.PIPE,shell=True).communicate()[0] | |
def set_objective(configfilename,execfilename): | |
f = open(configfilename) | |
lines = f.readlines() | |
f.close() | |
varinfo = [] | |
for line in lines: | |
param = line.split() | |
varname = param[0] | |
vartype = param[1] | |
varparam = param[2:] | |
varinfo.append((varname,vartype,varparam)) | |
def objective(trial): | |
varlist = [] | |
for (varname,vartype,varparam) in varinfo: | |
if vartype == "int": | |
varlist.append(trial.suggest_int(varname,int(varparam[0]),int(varparam[1]))) | |
elif vartype == "uniform": | |
varlist.append(trial.suggest_uniform(varname,float(varparam[0]),float(varparam[1]))) | |
elif vartype == "loguniform": | |
varlist.appned(trial.suggest_loguniform(varname,float(varparam[0]),float(varparam[1]))) | |
elif vartype == "discrete_uniform": | |
varlist.append(trial.suggest_discrete_uniform(varname,float(varparam[0]),float(varparam[1]),float(varparam[2]))) | |
valstrlist = map(lambda var: str(var), varlist) | |
cmd = execfilename+" "+(" ".join(valstrlist)) | |
ret = res_cmd(cmd) | |
return float(ret) | |
return objective | |
def main(): | |
argv = sys.argv | |
argc = len(argv) | |
if argc < 4: | |
print(argv[0]+" [config file] [executable file] [n_trials]") | |
study = optuna.create_study() | |
study.optimize(set_objective(argv[1],argv[2]), n_trials=int(argv[3])) | |
print(study.best_params) | |
if __name__ == '__main__': | |
main() |
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