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Re: How I got rid of term_variables/3 (Was: 50 Years of Prolog Nonsense)

From Mild Shock <janburse@fastmail.fm>
Newsgroups comp.lang.prolog
Subject Re: How I got rid of term_variables/3 (Was: 50 Years of Prolog Nonsense)
Date 2024-11-10 12:42 +0100
Message-ID <vgq66b$oq4a$2@solani.org> (permalink)
References <db903ba2-8ccd-418e-bd18-a9eb381cd222n@googlegroups.com> <e5616850-37a8-46fd-b2a8-e3ca252b8a5an@googlegroups.com> <vgq5ta$oq1o$1@solani.org> <vgq638$oq4a$1@solani.org>

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How did I solve the variant key problem,
which is present in the bagof/3 choker? I
went with numbervars/3 and unnumbervars/3.

But most likely if tries are used for tabling,
they can already do the same. I was looking
a little bit at the trie_insert() C implementation

used in SWI-Prolog distinct/1. It seems distinct/1
can solve the variant key problem by means of
trie_insert/2 alone, since for ordinary

terms it uses a no-op:

trieable(Term, ForTrie) :-
     acyclic_term(Term),
     term_attvars(Term, []),
     !,
     ForTrie = t(Term).

Not sure what is needed to enumerate variant key,
turn them back into ordinary terms together
with the associated values. I am also using the

nb_linkarg/3 trick for findall/3 inside bagof/3.
So the values are basically these single linked
lists. The same approach for bagof/3, is also

suitable for aggregate/3.

Mild Shock schrieb:
> But we can also do without term_variables/3 or
> term_variable/2.  don’ have tries in my system.
> But I recently introduced Okasaki tree, but it
> 
> turned out that they are totally useless. What
> works better in my case was hash+keysort, as
> strange as it may sound.
> 
> I believe it depends on the grouping factor.
> If there is a high grouping factor there is
> higher precentage of read from the grouping
> 
> datastructure and than write into the
> grouping datastructure. So if read is only O(1)
> as in hash, you have better preformance than if
> 
> read is O(log N) as in tree. And you can also
> afford a later keysort. Here is the bagof/3 choker
> with hash+keysort compared to tree:
> 
> /* Dogelog Player 1.2.5, tree */
> ?- time(test3).
> % Zeit 6073 ms, GC 1 ms, Lips 5182931, Uhr 10.11.2024 00:58
> true.
> 
> /* Dogelog Player 1.2.5, hash+keysort */
> ?- time(test4).
> % Zeit 3070 ms, GC 2 ms, Lips 9808736, Uhr 10.11.2024 00:58
> true.
> 
> Quite amazing, if we compare to the traditional bagof/3:
> 
> /* Trealla Prolog 2.59.17, keysort */
> ?- time(test).
> % Time elapsed 13.280s, 16158649 Inferences, 1.217 MLips
>     true.
> 
> Mild Shock schrieb:
>> It all began with the bagof/3 choker:
>>
>> test :-
>>     bagof(X, N^(between(1,300,X), between(1,300,N),
>>        length(_,N)), _), fail; true.
>>
>> Which makes Prolog system tumble:
>>
>> /* SWI-Prolog 9.3.14 */
>> ?- time(test).
>> Action (h for help) ? abort
>> % 468,739 inferences, 52.016 CPU in 53.069 seconds (98% CPU, 9012 Lips)
>> Execution Aborted
>>
>> /* Scryer Prolog 0.9.4-201 */
>> ?- time(test).
>> ^C   % CPU time: 110.153s, 145_508_466 inferences
>>     error('$interrupt_thrown',repl/0).
>>
>> Its mostlikely the same old problem that was
>> observed years ago, in that the canonicalization
>> of variables before the keysort/2 creates long
>>
>> instantiation chains. It can be solved by adjusting
>> the unification order. Here is a take in Dogelog Player:
>>
>> /* Dogelog Player 1.2.5 */
>> ?- time(test).
>> % Zeit 7405 ms, GC 21 ms, Lips 3962971, Uhr 10.11.2024 00:57
>> true.
>>
>>
> 

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50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2022-01-28 07:41 -0800
  Re: 50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2022-01-28 07:47 -0800
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                Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-09-01 12:02 -0700
                Re: 50 Years of Prolog Nonsense Mild Shock <janburse@fastmail.fm> - 2024-04-09 00:15 +0200
                Re: 50 Years of Prolog Nonsense Mild Shock <janburse@fastmail.fm> - 2024-04-09 00:20 +0200
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                Re: 50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2023-05-20 05:48 -0700
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                Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-05-27 04:51 -0700
                Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-06-01 14:10 -0700
                Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-06-01 14:11 -0700
                Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-06-01 14:17 -0700
                Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-06-03 05:20 -0700
                Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-06-03 09:10 -0700
                Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-06-02 00:44 -0700
                PIPs from the Basilisk Chamber (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-09-29 17:22 +0200
                Prolog Pearls I: Barklund and Millroth (Was: PIPs from the Basilisk Chamber) Mild Shock <janburse@fastmail.fm> - 2024-11-08 15:07 +0100
                Prolog Pearls II: Barklund and Millroth (Was: PIPs from the Basilisk Chamber) Mild Shock <janburse@fastmail.fm> - 2024-11-08 15:29 +0100
                change_arg/3 = nb_linkarg/3 ? (Was: PIPs from the Basilisk Chamber) Mild Shock <janburse@fastmail.fm> - 2024-11-08 18:37 +0100
                Re: change_arg/3 = nb_linkarg/3 ? (Was: PIPs from the Basilisk Chamber) Mild Shock <janburse@fastmail.fm> - 2024-11-08 18:39 +0100
                Re: PIPs from the Basilisk Chamber (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-09 15:47 +0100
                Re: PIPs from the Basilisk Chamber (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-09 15:48 +0100
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                Re: 50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2023-03-28 10:04 -0700
                Re: 50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2023-03-28 10:05 -0700
                Re: 50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2023-04-02 15:10 -0700
  Re: 50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2023-05-25 08:48 -0700
    Re: 50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2023-05-25 08:53 -0700
      Re: 50 Years of Prolog Nonsense Mostowski Collapse <bursejan@gmail.com> - 2023-05-25 09:02 -0700
  Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-07-29 04:57 -0700
    Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-07-29 05:10 -0700
      Re: 50 Years of Prolog Nonsense Mild Shock <janburse@fastmail.fm> - 2023-07-29 23:16 +0200
        Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-07-30 05:06 -0700
          Re: 50 Years of Prolog Nonsense Mild Shock <bursejan@gmail.com> - 2023-08-01 01:09 -0700
    How I got rid of term_variables/3 (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-10 12:37 +0100
      Re: How I got rid of term_variables/3 (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-10 12:40 +0100
        Re: How I got rid of term_variables/3 (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-10 12:42 +0100
    How Prolog became an education nightmare (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-12 16:30 +0100
      Re: How Prolog became an education nightmare (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-12 16:32 +0100
        Re: How Prolog became an education nightmare (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-14 05:14 +0100
          Re: How Prolog became an education nightmare (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-14 05:24 +0100
          Re: How Prolog became an education nightmare (Was: 50 Years of Prolog Nonsense) Julio Di Egidio <julio@diegidio.name> - 2024-11-14 21:21 +0100
            Re: How Prolog became an education nightmare (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-14 21:58 +0100
              Re: How Prolog became an education nightmare (Was: 50 Years of Prolog Nonsense) Mild Shock <janburse@fastmail.fm> - 2024-11-14 22:10 +0100
              Re: How Prolog became an education nightmare (Was: 50 Years of Prolog Nonsense) Julio Di Egidio <julio@diegidio.name> - 2024-11-15 15:42 +0100
      Mode yfy to the rescue (Was: How Prolog became an education nightmare) Mild Shock <janburse@fastmail.fm> - 2024-11-14 22:30 +0100
      Cyclic term predicates suffer from ambiguity (Was: How Prolog became an education nightmare) Mild Shock <janburse@fastmail.fm> - 2025-08-01 02:47 +0200
        An ISO term_variables/2 for Cyclic Terms (Was: Cyclic term predicates suffer from ambiguity) Mild Shock <janburse@fastmail.fm> - 2025-08-01 03:01 +0200

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