`CostFunc` returns unexpected results for illegal configuration if `objective_higher_is_better==True`

[stijnh]

Currently, if a configuration is illegal and objective_higher_is_better==True, CostFunc will return -sys.float_info.max.

However, all strategies assume that lower is better, meaning they assume that this point is an optimum. Instead of avoiding this configuration, the search strategies will instead purposely move towards this point.

kernel_tuner/kernel_tuner/strategies/common.py

Lines 111 to 114 in 486eed9

	# get numerical return value, taking optimization direction into account
	return_value = result[self.tuning_options.objective] or sys.float_info.max
	return_value = return_value if not self.tuning_options.objective_higher_is_better else -return_value

[benvanwerkhoven]

This has been resolved by pull #315 I believe. Right @stijnh ?

[benvanwerkhoven]

Confirmed by Stijn that this has been fixed.