util.py

import os, sys, math
import numpy as np



def printMessage(m_source, m_type, m_content):
	print '%s from %s: %s' % (m_type, m_source, m_content)

def rouletteWheelSelection(scores):
	rd_num = np.random.rand() * np.sum(scores)
	select_index = 0
	select = scores[select_index]
	while (select < rd_num) and (select_index < len(scores)):
		select_index 	+= 1
		select 			+= scores[select_index]
	return select_index

def stochasticUniversalSampling(scores, num_to_select):
	total_scores 	= sum(scores)
	select_step		= total_scores / num_to_select
	start 	 		= np.random.rand() * select_step
	pointers 		= np.arange(num_to_select).astype('float') * select_step + start
	select_idxes 	= []
	for pointer in pointers:
		select_idx 	= 0
		select 		= scores[select_idx]
		while (select < pointer) and (select_idx < len(scores)):
			select_idx 	+= 1
			select 		+= scores[select_idx]
		select_idxes.append(select_idx)
	return select_idxes

def makeDirsForFile(fileName):
	try:
		os.makedirs(os.path.split(fileName)[0])
	except:
		printMessage('makeDirsForFile', 'ERROR', 'Failed to make directories for %s.' % os.path.split(fileName)[1])

def makeDirs(dirName):
	try:
		os.makedirs(dirName)
	except:
		printMessage('makeDirs', 'ERROR', 'Failed to make directories for %s.' % dirName)