taktoa / eqsat Goto Github PK
View Code? Open in Web Editor NEWA language-generic implementation of equality saturation in Haskell
License: Other
A language-generic implementation of equality saturation in Haskell
License: Other
I suspect there could be a performance improvement if we used Judy arrays for EqSat.Internal.MHashMap
. We'd probably need to make our own typeclass that replaces Hashable
with something that will work better with the performance characteristics of Judy arrays (since sparse keys are undesirable).
judy
with unsafeIOToST
.Data.Judy
that exposes a cleaner interface using ST
.EqSat.Internal.MHashMap
.EqSat.Internal.MHashMap
over to Judy arrays.In many parts of this library, we take callbacks as input, mainly as a way of avoiding intermediate allocations and to allow equality saturation to be an "anytime" algorithm. We should replace these with a stream processing library like pipes
or streaming
. Since this library is meant to be performant, we will probably want to go with streaming
.
This could also make it possible to do even more optimizations; for example, it might make sense to have equality saturation emit a stream of differences to the equality proof tree, rather than re-emitting the proof tree every time. It also naturally supports incrementalization: it could accept a Producer
for diffs to the original Term
.
This idea is courtesy of @mckeankylej
It seems like it would be quite useful (e.g.: for implementing perfect sharing) to maintain the graph of strongly-connected components of a PEG/EPEG while we build up the graph. The current state of the art online algorithm for computation of strongly-connected components is described in A New Approach to Incremental Cycle Detection and Related Problems. Technically there are two algorithms described in that paper: one that has the best known complexity bound for sparse graphs and one that has the best bound for dense graphs. It seems likely to me that PEGs are mostly going to be sparse, though I may be underestimating the amount of sharing they have. Of course, in this regime I suspect the constant factors may matter more than the difference between an O(min(m^{3/2}, mn^{2/3}))
algorithm and an O(n^2 log(n))
algorithm.
The MonadFailDesugaring
extension allows us to catch any problems induced by the upcoming MonadFailProposal.
When running
nix-build ./default.nix --no-out-link -Q
it stops saying
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error: out of memory
$
Being at Xubuntu, Linux somename 4.4.0-127-generic #153-Ubuntu SMP Sat May 19 10:58:46 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Ideally, we could warn the user if the rewriting system they give is known not to be terminating and confluent. There is a sizable amount of research in this direction:
R
is confluent if its unraveling U(R)
is left-linear and confluent.TermIndex
Perfect
Mergeable
Removeable
We should support Term
nodes with associativity (A), commutativity (C), unitality (U), and idempotency (I) axioms, and combinations thereof.
(P, N, E)
, where P
is the set of subpatterns to match, N
is the set of children of the node we are matching at, and there is an edge in E
for every pair (p, n) ∈ P × N
such that p
matches n
.Unification for all of these is known to be decidable (and algorithms are known for them), though I haven't looked into efficiency for all of them.
this is proof. not 'eqsat', just my words
Our term indexing data structures could be useful for other Haskell projects, such as Hoogle or Idris or Agda. We should put them in a separate package, ideally with not too many dependencies.
TermIndex
Perfect
Mergeable
Removeable
The current pattern matching algorithm is inefficient, as it repeats a lot of work. The original equality saturation implementation (Peggy) used the Rete algorithm to cache pattern matches, but the implementation seems complicated, so I wrote a simple but expensive version to start out (and so that we can more easily test the Rete implementation once it is written).
Using the techniques described in From Conditional to Unconditional Rewriting by Grigore Roşu, we should be able to convert a conditional TRS (term-rewriting system) into an unconditional TRS, allowing us to expose an API that allows conditional rewriting without changing anything about our current matching or rewriting algorithms. This would probably be fairly useful in writing axioms, so we should support it.
Equation
type should change to support conditional rewriting rules.A declarative, efficient, and flexible JavaScript library for building user interfaces.
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