[MLA-1762] reduce memory allocations from DiscreteActionOutputApplier #4922
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Proposed change(s)
There were several intermediate tensors and float arrays (1d and 2d) allocated on each call. This reuses a single float[] for the CDF, and eliminates the other intermediate allocations. Now for each action, we compute the CDF and sample the result directly to the output ActionBuffers.DiscreteActions.
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