Control concurrency of evals

[filip-michalsky]

running 10+ evals on different browsers in parallel locally can become computationally challenging.

Braintrust offers a concurrency semaphor:
https://www.braintrust.dev/docs/guides/evals/run

import { Factuality, Levenshtein } from "autoevals";
import { Eval } from "braintrust";
 
Eval("Say Hi Bot", {
  data: () =>
    Array.from({ length: 100 }, (_, i) => ({
      input: `${i}`,
      expected: `${i + 1}`,
    })),
  task: (input) => {
    return input + 1;
  },
  scores: [Factuality, Levenshtein],
  maxConcurrency: 5, // Run 5 tests concurrently
});