ellmer
Call LLM APIs from R
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ellmer is a tool that facilitates the use of large language models (LLM) from R. It supports various LLM providers and offers features such as streaming outputs, tool/function calling, and structured data extraction. Users can interact with ellmer in different ways, including interactive chat console, interactive method call, and programmatic chat. The tool provides support for multiple model providers and offers recommendations for different use cases, such as exploration or organizational use.
README:
ellmer makes it easy to use large language models (LLM) from R. It supports a wide variety of LLM providers and implements a rich set of features including streaming outputs, tool/function calling, structured data extraction, and more.
(Looking for something similar to ellmer for python? Check out chatlas!)
You can install ellmer from CRAN with:
install.packages("ellmer")ellmer supports a wide variety of model providers:
- Anthropic’s Claude:
chat_claude(). - AWS Bedrock:
chat_bedrock(). - Azure OpenAI:
chat_azure(). - Databricks:
chat_databricks(). - GitHub model marketplace:
chat_github(). - Google Gemini:
chat_gemini(). - Groq:
chat_groq(). - Ollama:
chat_ollama(). - OpenAI:
chat_openai(). - perplexity.ai:
chat_perplexity(). - Snowflake Cortex:
chat_cortex(). - VLLM:
chat_vllm().
If you’re using ellmer inside your organisation, you’ll be limited to
what your IT department allows, which is likely to be one provided by a
big cloud provider, e.g. chat_azure(), chat_bedrock(),
chat_databricks(), or chat_snowflake(). If you’re using ellmer for
your own exploration, you’ll have a lot more freedom, so we have a few
recommendations to help you get started:
-
chat_openai()orchat_claude()are good places to start.chat_openai()defaults to GPT-4o, but you can usemodel = "gpt-4o-mini"for a cheaper, lower-quality model, ormodel = "o1-mini"for more complex reasoning.chat_claude()is also good; it defaults to Claude 3.5 Sonnet, which we have found to be particularly good at writing code. -
chat_gemini()is great for large prompts because it has a much larger context window than other models. It allows up to 1 million tokens, compared to Claude 3.5 Sonnet’s 200k and GPT-4o’s 128k. -
chat_ollama(), which uses Ollama, allows you to run models on your own computer. While the biggest models you can run locally aren’t as good as the state of the art hosted models, they don’t share your data and are effectively free.
You can work with ellmer in several different ways, depending on whether you are working interactively or programmatically. They all start with creating a new chat object:
library(ellmer)
chat <- chat_openai(
model = "gpt-4o-mini",
system_prompt = "You are a friendly but terse assistant.",
)Chat objects are stateful R6 objects: they
retain the context of the conversation, so each new query builds on the
previous ones. You call their methods with $.
The most interactive and least programmatic way of using ellmer is to
chat directly in your R console or browser with live_console(chat) or
live_browser():
live_console(chat)
#> ╔════════════════════════════════════════════════════════╗
#> ║ Entering chat console. Use """ for multi-line input. ║
#> ║ Press Ctrl+C to quit. ║
#> ╚════════════════════════════════════════════════════════╝
#> >>> Who were the original creators of R?
#> R was originally created by Ross Ihaka and Robert Gentleman at the University of
#> Auckland, New Zealand.
#>
#> >>> When was that?
#> R was initially released in 1995. Development began a few years prior to that,
#> in the early 1990s.Keep in mind that the chat object retains state, so when you enter the chat console, any previous interactions with that chat object are still part of the conversation, and any interactions you have in the chat console will persist after you exit back to the R prompt. This is true regardless of which chat function you use.
The second most interactive way to chat is to call the chat() method:
chat$chat("What preceding languages most influenced R?")
#> R was primarily influenced by the S programming language, particularly S-PLUS.
#> Other languages that had an impact include Scheme and various data analysis
#> languages.If you initialize the chat object in the global environment, the chat
method will stream the response to the console. When the entire response
is received, it’s also (invisibly) returned as a character vector. This
is useful when you want to see the response as it arrives, but you don’t
want to enter the chat console.
If you want to ask a question about an image, you can pass one or more
additional input arguments using content_image_file() and/or
content_image_url():
chat$chat(
content_image_url("https://www.r-project.org/Rlogo.png"),
"Can you explain this logo?"
)
#> The logo of R features a stylized letter "R" in blue, enclosed in an oval
#> shape that resembles the letter "O," signifying the programming language's
#> name. The design conveys a modern and professional look, reflecting its use
#> in statistical computing and data analysis. The blue color often represents
#> trust and reliability, which aligns with R's role in data science.The most programmatic way to chat is to create the chat object inside a
function. By doing so, live streaming is automatically suppressed and
$chat() returns the result as a string:
my_function <- function() {
chat <- chat_openai(
model = "gpt-4o-mini",
system_prompt = "You are a friendly but terse assistant.",
)
chat$chat("Is R a functional programming language?")
}
my_function()
#> [1] "Yes, R supports functional programming concepts. It allows functions to
#> be first-class objects, supports higher-order functions, and encourages the
#> use of functions as core components of code. However, it also supports
#> procedural and object-oriented programming styles."If needed, you can manually control this behaviour with the echo
argument. This is useful for programming with ellmer when the result is
either not intended for human consumption or when you want to process
the response before displaying it.
ellmer comes with a bunch of vignettes to help you learn more:
- Learn key vocabulary and see example use cases in
vignette("ellmer"). - Learn how to design your prompt in
vignette("prompt-design"). - Learn about tool/function calling in
vignette("tool-calling"). - Learn how to extract structured data in
vignette("structured-data"). - Learn about streaming and async APIs in
vignette("streaming-async").
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