(Ready for review): Switch combinator#334

Merged

marcoct merged 31 commits intoprobcomp:masterfrom

femtomc:20201116_mrb_switch_combinator

Dec 8, 2020

Commits on Nov 18, 2020

Split into two combinators: Switch and WithProbability implementations.
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Working on Switch update and regenerate.
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Added Switch update and regenerate.
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Added Switch update and regenerate - working out kinks in update.
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update and regenerate appear to be computing the correct ratios. To confirm with Marco/Alex.
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Fixed generate index type bug.
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Branch dispatch done using diff types.
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Branch dispatch done using diff types.
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Branch dispatch done using diff types.
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Added custom methods in update for Switch which allow the merging of overlapping choice maps and the computation of the discard addresses in update.
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Added custom methods in update for Switch which allow the merging of overlapping choice maps and the computation of the discard addresses in update.
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Idiomatic check for EmptyChoiceMap.
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Working on backprop - seems simple? Could it really be?
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Extracting WithProb combinator into another PR.
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Commits on Nov 22, 2020

Renamed mix field of Switch generative function to branches to more accurately reflect the pattern.
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Commits on Dec 5, 2020

Addressed review comments. Added docstrings where necessary. Corrected update_discard. Added test to test the discard functionality in a hierarchical model example.
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