Does Leela use hash table?

[Karol Majewski]

I thought she doesn't use hash tables and there is no 'Hash' option name there. However, during analysis in UCI output I see 'hashfull' value increasing. What is this all about?

[Dan Kelly]

Leela does do a form of tree searching so she benefits from a hash table.

On Fri, Aug 24, 2018 at 4:55 PM Karol Majewski <karol.m...@gmail.com> wrote:

I thought she doesn't use hash tables and there is no 'Hash' option name there. However, during analysis in UCI output I see 'hashfull' value increasing. What is this all about?

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[Karol Majewski]

So how can I adjust hash value if there is no UCI option called Hash?

[Dan Kelly]

It's in Arena in the section where you set values common to all the engines.

I don't know about other chess interfaces I haven't tried them yet.

On Sat, Aug 25, 2018 at 3:55 AM Karol Majewski <karol.m...@gmail.com> wrote:

So how can I adjust hash value if there is no UCI option called Hash?

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[Karol Majewski]

But the engine itself doesn't list Hash option when you run it in command line and type 'uci'. So it looks likę it's impossible to adjust hash value. But then if you run analysis (for example 'go infinite') you can see that hashfull value is getting higher.

[Alexander Lyashuk]

Leela doesn't use hash table, it stores tree as classical tree (with pointers to children etc). The tree is small enough to fit into memory with this representation.

What Lc0 shows in "hash usage" is usage of NN eval cache, completely different thing.

On Sat, Aug 25, 2018 at 7:42 PM Karol Majewski <karol.m...@gmail.com> wrote:

But the engine itself doesn't list Hash option when you run it in command line and type 'uci'. So it looks likę it's impossible to adjust hash value. But then if you run analysis (for example 'go infinite') you can see that hashfull value is getting higher.

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[Dan Kelly]

Yes I was thinking about traditional engines. Yes Leela uses a cache.

Altho I would be surprised to find out that Leela does not avoid evaluating

positions it has already processed with the neural net.

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