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Fix some corner cases when sampling a SumTree #83
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Though the fix here seems to be trivial. But it fixes some big problems in prioritized experience buffer.
Before this, the loss of rainbow with atari pong:
After this fix:
The reason is that, in some cases,
get(t::SumTree, v)might returnind, pwherep=0.0. And it makes the rescaled weights decreased to nearly zero.