Github user KellenSunderland commented on the issue:
    @kpu I partially agree about sentence.  The sentence object is meant to be 
scoped to a single translation of a sentence.  For calls to probRule this helps 
    For estimate I'm not so sure.  A rule can have estimateRuleCost called on 
it even when Joshua is not translation anything. For example as a result of 
calling sort on a grammar during startup before any requests are processed.  In 
fact the only usage of estimate being called perviously was passing null as the 
argument for sentence.  For the time being I'm creating the ChartState object 
once per call, and then immediately releasing it afterwards.  We'll have to 
test the performance impact of doing this, but this shouldn't actually be 
called when decoding so hopefully it won't affect decoding perf.

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