---
title: "Small experiment with LLMR"
output: rmarkdown::html_vignette
vignette: >
  %\VignetteIndexEntry{Small experiment with LLMR}
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteEncoding{UTF-8}
---

```{r}
knitr::opts_chunk$set(
  collapse = TRUE, comment = "#>",
  eval = identical(tolower(Sys.getenv("LLMR_RUN_VIGNETTES", "false")), "true") )
```  

## Overview

This vignette demonstrates:

1. Building factorial experiment designs with `build_factorial_experiments()`
2. Running experiments in parallel with `call_llm_par()`
3. Comparing unstructured vs. structured output across providers

The workflow is: **design → parallel execution → analysis**

We will compare three configurations on two prompts, once unstructured and once with structured output. In choosing models, note that at the time of writing this vignette, Gemini models are not guaranteeing the schema output and is more likely to run into trouble. 

```{r}
library(LLMR)
library(dplyr)
cfg_openai <- llm_config("openai",   "gpt-5-nano")
cfg_cld    <- llm_config("anthropic","claude-sonnet-4-6", max_tokens = 512)
cfg_groq   <- llm_config("groq",     "openai/gpt-oss-20b")
```

## Build a factorial design
```{r}
experiments <- build_factorial_experiments(
  configs       = list(cfg_openai, cfg_cld, cfg_groq),
  user_prompts  = c("Summarize in one sentence: The Apollo program.",
                    "List two benefits of green tea."),
  system_prompts = c("Be concise.")
)
experiments
```

## Run unstructured
```{r}
setup_llm_parallel(workers = 10)
res_unstructured <- call_llm_par(experiments, progress = TRUE)
reset_llm_parallel()
res_unstructured |>
  select(provider, model, user_prompt_label, response_text, finish_reason) |>
  head()
```

**Understanding the results:**

The `finish_reason` column shows why each response ended:

- `"stop"`: normal completion
- `"length"`: hit token limit (increase `max_tokens`)
- `"filter"`: content filter triggered

The `user_prompt_label` helps track which experimental condition produced each response.

## Structured version
```{r}
schema <- list(
  type = "object",
  properties = list(
    answer = list(type="string"),
    keywords = list(type="array", items = list(type="string"))
  ),
  required = list("answer","keywords"),
  additionalProperties = FALSE
)

experiments2 <- experiments
experiments2$config <- lapply(experiments2$config, enable_structured_output, schema = schema)

setup_llm_parallel(workers = 10)
res_structured <- call_llm_par_structured(experiments2 , .fields = c("answer","keywords") )
reset_llm_parallel()

res_structured |>
  select(provider, model, user_prompt_label, structured_ok, answer) |>
  head()


```


