LLM Chat

Large Language Models (LLM) are an inflection point in computing. The represent significant advancements and automation for tasks. Generating code is among them and there are many interesting topics at the intersection of LLMs and Hof.

hof chat

The hof chat command is and early preview for interacting with hof using natural language prompts. You can already use this to:

  1. Talk with ChatGPT from the command line or vim
  2. Talk with Hof data models (full demo coming soon :)

$ hof help chat

Use chat to work with hof features or from modules you import.
Module authors can provide custom prompts for their schemas.

This is an alpha stage command, expect big changes next release.
We currently use t

Currently, only ChatGPT is supported. You can use any of the
gpt-3.5 or gpt-4 models. The flag should match OpenAI API options.
While we are using the chat models, we do not support interactive yet.

Set OPENAI_API_KEY as an environment variable.


# Talk to LLMs (ChatGPT or Bard)

# select the model with -m
# full model name supported, also several shorthands
hof chat -m "gpt3" "why is the sky blue?" (gpt-3.5-turbo)
hof chat -m "bard" "why is the sky blue?"  (chat-bison@001)

# Ask of the LLM from strings, files, and/or stdin
# these will be concatenated to from the question
hof chat "Ask ChatGPT any question"    # as a string
hof chat question.txt                  # from a file
cat question.txt | hof chat -          # from stdin
hof chat context.txt "and a question"  # mix all three

# Provide a system message, these are special to LLMs
# this is typically where the prompt engineering happens
hof chat -S prompt.txt "now answer me this..."
hof chat -S "... if short prompt ..." "now answer me this..."

# Provide examples to the LLM
# for Bard, these are an additional input
# for ChatGPT, these will be appended to the system message
# examples are supplied as JSON, they should be [{ input: string, output: string }]
hof chat -E "<INPUT>: this is an input <OUTPUT>: this is an output" -E "..." "now answer me this..."
hof chat -E examples.json "now answer me this"

# Provide message history to the LLM
# if messages are supplied as JSON, they should be { role: string, content: string }
hof chat -M "user> asked some question" -M "assistant> had a reply" "now answer me this..."
hof chat -M messages.json "now answer me this"

  hof chat [args] [flags]
  hof chat [command]

Available Commands:
  info        print details of a specific chat plugin
  list        print available chat plugins in the current module
  with        chat with a plugin in the current module

  -N, --choices int           param: choices or N (openai) (default 1)
  -e, --example stringArray   string or path to an example pair for the LLM
  -h, --help                  help for chat
      --max-tokens int        param: MaxTokens (default 256)
  -m, --message stringArray   string or path to a message for the LLM
  -M, --model string          LLM model to use [gpt-3.5-turbo,gpt-4,bard,chat-bison] (default "gpt-3.5-turbo")
  -O, --outfile string        path to write the output to
      --stop stringArray      param: Stop (openai)
  -s, --system stringArray    string or path to the system prompt for the LLM, concatenated
      --temp float            param: temperature (default 0.8)
      --topk int              param: TopK (google) (default 40)
      --topp float            param: TopP (default 0.42)

Global Flags:
  -E, --all-errors           print all available errors
  -i, --ignore-errors        turn off output and assume defaults at prompts
  -D, --include-data         auto include all data files found with cue files
  -V, --inject-env           inject all ENV VARs as default tag vars
  -I, --input stringArray    extra data to unify into the root value
  -p, --package string       the Cue package context to use during execution
  -l, --path stringArray     CUE expression for single path component when placing data files
  -q, --quiet                turn off output and assume defaults at prompts
  -d, --schema stringArray   expression to select schema to apply to data files
      --stats                print generator statistics
  -0, --stdin-empty          A flag that ensure stdin is zero and does not block
  -t, --tags stringArray     @tags() to be injected into CUE code
  -v, --verbosity int        set the verbosity of output
      --with-context         add extra context for data files, usable in the -l/path flag

Use "hof chat [command] --help" for more information about a command.

where we are going

We see Hof + LLM as better than either on their own.

LLMs provide for natural language interfaces to all things Hof

We are building a future where LLM powered Hof is your coding assistant, allowing you to use the best interface (LLM, IDE, low-code) for the task at hand.

Hof simplifies code gen with LLMs

Hof’s deterministic code gen means that the LLMs only have to generate the data models and extra configuration needed for generators. This has many benefits.

  • The task for the LLM is much easier and they can do a much better job.
  • The code generation is backed by human written code, so no hallucinations.
  • The same benefits for generating code at scale with Hof.

Other places we see LLMs helping Hof

  • importing existing code to CUE & Hof
  • automatically transforming existing code to hof generators
  • filling in the details and gaps in generated code
  • in our premium user interfaces for low-code (these are more the multi-modal models, which come after LLMs, think Google Gemini)