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LLM::Graph

Raku package used to efficiently schedule and combine multiple LLM generation steps.

The package provides the class LLM::Graph with which computations are orchestrated. (A good "real-life" example is given in the blog post "Agentic-AI for text summarization", [AA2].)

The package follows the design discussed in the video "Live CEOing Ep 886: Design Review of LLMGraph", [WRIv1], and the corresponding Wolfram Language function LLMGraph, [WRIf1].

The package implementation heavily relies on the package "LLM::Functions", [AAp1]. Graph functionalities are provided by "Graph", [AAp3].

Installation

Package installations from both sources use zef installer (which should be bundled with the "standard" Rakudo installation file.)

To install the package from Zef ecosystem use the shell command:

zef install LLM::Graph

To install the package from the GitHub repository use the shell command:

zef install https://github.com/antononcube/Raku-LLM-Graph.git

Design

Creation of an LLM::Graph object in which "node_i" evaluates fun_i with results from parent nodes:

LLM::Graph.new({name_1 => fun_1, ...})

LLM::Graph objects are callables. Getting the result of a graph on input:

LLM::Graph.new(...)(input)

Details and options

An LLM::Graph enables efficient scheduling and integration of multiple LLM generation steps optimizing evaluation by managing the concurrency of LLM requests.
Using LLM::Graph requires (LLM) service authentication and internet connectivity.
- Authentication and internet are required if all graph nodes are non-LLM computation specs.
Possible values of the node function spec fun_i are:


`llm-function(...)`	an `llm-function` for LLM submission
`sub (...) {...}`	a sub for Raku computation submission
`%(key_i => val_i ...)`	a `Map` with detailed node specifications `nodespec`

Possible node specifications keys in nodespec are:


"eval-function"	arbitrary Raku sub
"llm-function"	LLM evaluation via an `llm-function`
"listable-llm-function"	threaded LLM evaluation on list input values
"input"	explicit list of nodes required as sub arguments
"test-function"	whether the node should run
"test-function-input"	explicit list of nodes required as test arguments

Each node must be defined with only one of "eval-function", "llm-function", or "listable-llm-function".
The spec-synonyms "eval-sub", "llm-sub", "listable-llm-sub", and "test-sub" can be used instead of "eval-function", "llm-function", "listable-llm-function", and "test-function", respectively.
The "test-function" specification makes a node evaluation conditional on the results from other nodes.
Possible "llm-function" specifications prompt_i include:


"text"	static text
`["text1", ...]`	a list of strings
`llm-prompt("name")`	a repository prompt
`sub ($arg1..) {"Some $arg1 text"}`	templated text
`llm-function(...)`	an `LLM::Function` object

Any "node_i" result can be provided in input as a named argument. input can have one positional argument and multiple named arguments.
LLM::Graph objects have the attribute llm-evaluator that is used as a default (or fallback) LLM evaluator object. (See [AAp1].)
The Boolean option "async" in LLM::Graph.new can be used to specify if the LLM submissions should be made asynchronous.
- The class Promise is used.
By default, the LLM competitions are asynchronous (i.e. :$async => True.)

Usage examples

Three poets

Make an LLM graph with three different poets, and a judge that selects the best of the poet-generated poems:

use LLM::Graph;
use Graph;

my %rules =
        poet1 => "Write a short poem about summer.",
        poet2 => "Write a haiku about winter.",
        poet3 => sub ($topic, $style) {
            "Write a poem about $topic in the $style style."
        },
        judge => sub ($poet1, $poet2, $poet3) {
            [
                "Choose the composition you think is best among these:\n\n",
                "1) Poem1: $poet1",
                "2) Poem2: $poet2",
                "3) Poem3: $poet3",
                "and copy it:"
            ].join("\n\n")
        };

my $gBestPoem = LLM::Graph.new(%rules);

Calculation with special parameters (topic and style) for the 3rd poet:

$gBestPoem(topic => 'hockey', style => 'limerick');

Remark Instances of LLM::Graph are callables. Instead of $gBestPoem(...), $gBestPoem.eval(...) can be used.

Computations dependency graph:

$gBestPoem.dot(engine => 'dot', node-width => 1.2 ):svg

image i_raw_githubusercontent_com_antononcube_raku_llm_graph_refs_heads_main_docs_three_poets_graph_svg not found

The result by the terminal node("judge"):

say $gBestPoem.nodes<judge>;

Further examples

The following notebooks provide more elaborate examples:

The following notebook gives visual dictionaries for the interpretation of LLM-graph plots:

"Graph-plots-interpretation-guide.ipynb"

Implementation notes

LLM functors introduction

Since the very beginning, the functions produced by "LLM::Functions" were actually blocks (Block:D). It was in my TODO list for a long time instead of blocks to produce functors (function objects). For "LLM::Graph" that is/was necessary in order to make the node-specs processing more adequate.
- So, llm-function produces functors (LLM::Function objects) by default now.
- The option "type" can be used to get blocks.

No need for topological sorting

I thought that I should use the graph algorithms for topological sorting in order to navigate node dependencies during evaluation.
Turned out, that is not necessary -- simple recursion is sufficient.
- From the nodes specs, a directed graph (a Graph object) is made.
- Graph's method reverse is used to get the directed computational dependency graph.
- That latter graph is used in the node-evaluation recursion.

Wrapping "string templates"

It is convenient to specify LLM functions with "string templates."
Since there are no separate "string template" objects in Raku, subs or blocks are used.
- For example:
- sub ($country, $year) {"What is the GDP of $country in $year"} (sub)
- {"What is the GDP of $^a in $^b?"} (block)
String template subs are wrapped to be executed first and then the result is LLM-submitted.
Since the blocks cannot be wrapped, currently "LLM::Graph" refuses to process them.
- It is planned later versions of "LLM::Graph" to process blocks.

Special graph plotting

Of course, it is nice to have the LLM-graphs visualized.
Instead of the generic graph visualization provided by the package "Graph" (method dot) a more informative graph plot is produced in which the different types of notes have different shapes.
- The graph vertex shapes help distinguishing LLM-nodes from just-Raku-nodes.
- Also, test function dependencies are designated with dashed arrows.
- The shapes in the graph plot can be tuned by the user.
- See the Jupyter notebook "Graph-plots-interpretation-guide.ipynb".