Create an Exact Match Metric

Creates a metric function that checks for exact string match between predicted and expected values. Can optionally extract a specific field from structured outputs.

Usage

metric_exact_match(field = NULL, ignore_case = FALSE, normalize = TRUE)

Arguments

field

Optional field name to extract from structured outputs

ignore_case

Logical, whether to ignore case when comparing

normalize

Logical, whether to normalize whitespace

Value

A function with signature function(prediction, expected) -> logical

Examples

# Simple exact match
metric <- metric_exact_match()
metric("hello", "hello")  # TRUE
#> [1] TRUE
metric("hello", "world")  # FALSE
#> [1] FALSE

# Field extraction for structured outputs
metric <- metric_exact_match(field = "sentiment")
metric(list(sentiment = "positive"), list(sentiment = "positive"))  # TRUE
#> [1] TRUE

# Case insensitive matching
metric <- metric_exact_match(ignore_case = TRUE)
metric("Hello", "hello")  # TRUE
#> [1] TRUE