AI: new wiki page
This is a start at adding some information about using AI services from Go.
Change-Id: I90d6c2ff959df2f3d62afde70ed5105f128bbc03
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/588895
Reviewed-by: Eli Bendersky <eliben@google.com>
Commit-Queue: Ian Lance Taylor <iant@golang.org>
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+---
+title: AI
+---
+
+A list of resources for accessing AI (Artificial Intelligence)
+services using Go, notably Large Language Models (LLM) and Machine
+Learning (ML) systems.
+
+## What kind of AI applications can you build with Go?
+
+Go is an excellent language for writing programs that use AI services.
+This includes programs that use LLM services for summarizing or
+classifying data, answering questions based on a database, or avoiding
+repetitive tasks.
+The services can be accessed on the Internet (hosted services), or run
+locally (downloaded services).
+
+For example, the program
+[golang.org/x/cmd/vulndb/vulnreport](https://pkg.go.dev/golang.org/x/vulndb/cmd/vulnreport)
+uses AI to summarize vulnerability reports.
+When a member of Go's security team runs the program with a new
+vulnerability report, vulnreport contacts a generative AI service (in
+this case Google's generative AI service).
+It passes a
+[prompt](https://go.googlesource.com/vulndb/+/refs/heads/master/internal/genai/templates/preamble.txt)
+along with the original description of the vulnerability.
+The AI service will respond with a concise summary.
+The Go security team member can then refine that into the final
+human-readable report.
+
+## How do I find Go packages to access AI services?
+
+This is a fast moving area of development, and these answers may
+change.
+
+If you have a specific service or services in mind, many service
+providers have their own Go packages.
+
+If you want to be flexible about services, use a general framework
+like [langchaingo](https://pkg.go.dev/github.com/tmc/langchaingo) or
+[Ollama](https://pkg.go.dev/github.com/ollama/ollama/api).
+
+### Some specific services
+
+- Google Generative AI:
+ [github.com/google/generative-ai-go/genai](https://pkg.go.dev/github.com/google/generative-ai-go/genai).
+ - [Examples](https://pkg.go.dev/github.com/google/generative-ai-go/genai#pkg-examples)
+- Google Cloud Vertex AI:
+ [cloud.google.com/go/vertexai/genai](https://pkg.go.dev/cloud.google.com/go/vertexai/genai).
+ - [Examples](https://pkg.go.dev/cloud.google.com/go/vertexai/genai#pkg-examples)
+
+## How do I call a hosted service from Go?
+
+It varies from service to service, but the basic steps are
+- create a client
+- assemble a message to send to the model
+ - the message will include a prompt that asks a question or tells
+ the service what to do
+ - the message can have different parts
+- send the message to the client
+- receive a reply
+
+Here is a [complete small example using the Google AI service](https://eli.thegreenplace.net/2023/using-gemini-models-from-go/).
+
+## How do I call a downloaded service from Go?
+
+Ollama provides a good framework for using downloaded services.
+Ollama runs on the local machine but opens a post on the localhost to
+provide a REST API.
+At that point Ollama can be treated as a hosted service, but the
+actual AI computation will be done on the local machine.
+
+Here is a [complete small example of using Ollama from Go](https://eli.thegreenplace.net/2023/using-ollama-with-langchaingo/).
+
+## How do I manage prompts in Go?
+
+The message sent to an LLM service is referred to as a _prompt_.
+In many cases a program will have a general prompt that contains
+variables that are filled in based on user input.
+In Go a natural way to do this is to use the
+[text/template package](https://pkg.go.dev/text/template).
