PS needs to be evicted by business policy

[nealgavin]

1. feature score
   Each feature has a feature _ score that is calculated a
   feature_score=clk_coeffpos_ins_num+nonclk_coeffneg_ins_num
   On push, feature _ score is always accumulated
2. time_decay
   End _ day (sample time) will trigger time _ decay
   Time _ decay, the feature _ score is attenuated by CVM _ plugin.decay _ ratio
3. shrink_table
   After time _ decay, or when feature _ num exceeds Max _ features during training, shrink _ table is triggered
   If one of the conditions is met, it is deleted:
   ● score < _delete_threshold
   ● value.unseen_days > _delete_after_unseen_days
   ● _ select _ prob _ slot _ set.get (value.slot) = = 1 & & score < _ select _ delete _ threshold/Id Group Id type feature, increase delete threshold
   ● _ photoid _ slot _ set.get (value.slot) = = 1 & & value.unseen _ days > 2/Delete after two days of combined photo _ ID feature
   If feature _ num is still greater than Max _ features after deletion, it will be deleted from small to large according to feature score until feature _ num < Max _ features is satisfied

[stale]

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