docs: improve multiset_delta() docs
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| /// released out. Conversely, `unique` take repeated items in, and only releases the new ones out. | ||
| /// | ||
| /// This operator does a similar inversion but for multiset semantics, with some caveats. When it | ||
| /// receives duplicate items, instead of ignoring them, it "subtracts" them from the items received |
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"subtracts" is confusing. Why not say "if we received k copies of an item in the previous tick, and we receive l > k copies in the current tick, we output l - k copies of the item."
| /// This operator does a similar inversion but for multiset semantics, with some caveats. When it | ||
| /// receives duplicate items, instead of ignoring them, it "subtracts" them from the items received | ||
| /// in the previous tick, and only releases new items if there are more than in the previous tick. | ||
| /// However unlike `unique`, this count is only maintained for the previous tick, not over all time. |
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Given the proposed rewording above, maybe rephrase to match.
I'm actually confused as to whether it remembers the MAX number of copies over time, or just the last tick number? If it's MAX, then we should probably implement a generic lattice_delta, where this is a specific one for multiset lattices. If it's not MAX, then I'd like to discuss semantics --- it'd be weird for this to be the only 1-tick windowed operator (other than next_tick).
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It is only the previous tick. The semantics become weird if it's not somewhere after a persist operator
| /// // 5, 3 | ||
| /// // First two "3"s are removed due to previous tick. | ||
| /// // 'c', 'a' | ||
| /// // First two 'a's are removed due to previous tick. |
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Give an example of the 3rd tick to clarify what confuses me above about MAX over all time vs last tick?
|
OK as a separate issue we should review semantics, understand how Shadaj is
using it, see if we can design something less weird
…On Mon, Jul 10, 2023 at 10:51 PM Mingwei Samuel ***@***.***> wrote:
***@***.**** commented on this pull request.
------------------------------
In hydroflow_lang/src/graph/ops/multiset_delta.rs
<#830 (comment)>
:
> @@ -5,30 +5,43 @@ use super::{
WriteContextArgs, RANGE_0, RANGE_1,
};
-// TODO(mingwei): more doc
-/// Multiset delta from the previous tick.
+/// The multiset inverse of [`persist()`](#persist).
+///
+/// > 1 input stream of `T`, 1 output stream of `T`, where `T: Eq + Hash`
+///
+/// For set semantics, [`unique()`](#unique) can be thought of as a "delta" operator, the inverse
+/// of [`persist()`](#persist). In `persist`, new items come in, and all items are repeatedly
+/// released out. Conversely, `unique` take repeated items in, and only releases the new ones out.
+///
+/// This operator does a similar inversion but for multiset semantics, with some caveats. When it
+/// receives duplicate items, instead of ignoring them, it "subtracts" them from the items received
+/// in the previous tick, and only releases new items if there are more than in the previous tick.
+/// However unlike `unique`, this count is only maintained for the previous tick, not over all time.
It is only the previous tick. The semantics become weird if it's not
somewhere after a persist operator
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