Phoenix Integration

import { openai } from "@ai-sdk/openai";import { createFaithfulnessEvaluator } from "@arizeai/phoenix-evals";import { createDataset } from "@arizeai/phoenix-client/datasets";import {  asExperimentEvaluator,  runExperiment,} from "@arizeai/phoenix-client/experiments";await createDataset({  name: "support-eval",  description: "Support questions with expected answers",  examples: [    {      input: {        question: "Is Phoenix open source?",        context: "Phoenix is open source.",      },      output: {        answer: "Phoenix is open source.",      },    },  ],});const faithfulness = createFaithfulnessEvaluator({  model: openai("gpt-4o-mini"),});await runExperiment({  dataset: { datasetName: "support-eval" },  task: async ({ question, context }) =>    `${question} Answer using only this context: ${context}`,  evaluators: [    asExperimentEvaluator({      name: "faithfulness",      kind: "LLM",      evaluate: async ({ input, output }) =>        faithfulness.evaluate({          input: String(input.question ?? ""),          context: String(input.context ?? ""),          output: String(output ?? ""),        }),    }),  ],});