[MLA-1762] reduce memory allocations from DiscreteActionOutputApplier#4922
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chriselion
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Feb 8, 2021
| public int Sample(float[] cmf) | ||
| /// <param name="branchSize">The number of possible branches, i.e. the effective size of the cmf array.</param> | ||
| /// <returns>A sampled index from the CMF ranging from 0 to branchSize-1.</returns> | ||
| public int Sample(float[] cmf, int branchSize) |
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Because the float[] might be larger than we need now, we also pass the effective size of the array.
We could instead (or in additionally) repeat the final sumProb value in ComputeCdf()
vincentpierre
approved these changes
Feb 8, 2021
| readonly ITensorAllocator m_Allocator; | ||
| readonly ActionSpec m_ActionSpec; | ||
| readonly int[] m_StartActionIndices; | ||
| readonly float[] m_cdfBuffer; |
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| if (src.data.batch != dst.data.batch) | ||
| { | ||
| throw new ArgumentException("Batch size for input and output data is different!"); |
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Are these exceptions no longer needed ?
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Not sure they were ever necessary in the first place. The temporary tensors they were referencing are no longer needed.
surfnerd
approved these changes
Feb 8, 2021
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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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