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Experiment Loop Palico helps you setup this iterative loop for you and your team with Experiments.

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Setting up Experiments

1

Setup your test-cases

Create a list of test-cases that models the expected behavior of your application. Add these test-cases to src/evals/<test-group>/index.ts file.
src/evals/history/index.ts
const testCases: TestDatasetFN = async () => {
  return [
    {
      input: { // input to your LLM Application
        userMessage: "What is the capital of France?",
      },
      tags: { // tags to help you categorize your test-cases
        intent: "question",
      },
      metrics: [
        // example metrics
        containsEvalMetric({
          substring: "Paris",
        }),
        levensteinEvalMetric({
          expected: "Paris",
        }),
        rougeSkipBigramSimilarityEvalMetric({
          expected: "Paris",
        }),
      ],
    },
  ];
};
You can setup test-cases by creating a static list or fetching from external data-sources. You have access to various metrics to measure the performance of your LLM Application but you can also create your own custom metrics. Learn more about setting up test-cases.
2

Run an evaluation

Run evaluations against different variation of your application in Studio using App Config. Navigate to the Studio > Experiments, create a new experiment, and run evaluations against different versions of your application.
3

Analyze results

Analyze result across different evaluations in Studio > Experiments > Notebooks. Notebook gives you various data analysis tools to help you analyze the results.

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Defining Test Cases

Create test groups by creating a folder within evals directory. Each test group should have an index.ts file that exports a TestDatasetFN function. This function should return an array of test-cases. Here’s an example of statically defining test-cases:
src/evals/history/index.ts
const testCases: TestDatasetFN = async () => {
  return [
    {
      input: {
        userMessage: "What is the capital of France?",
      },
      tags: {
        intent: "question",
      },
      metrics: [
        containsEvalMetric({
          substring: "Paris",
        }),
        levensteinEvalMetric({
          expected: "Paris",
        }),
        rougeSkipBigramSimilarityEvalMetric({
          expected: "Paris",
        }),
      ],
    },
  ];
};

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Test Cases from External Data-Source

You can also fetch test-cases from external data-sources. Here’s an example fetching test-cases from a database:
src/evals/history/index.ts
import {
  containsAllEvalMetric,
  levensteinEvalMetric,
  testFromDataset,
} from "@palico-ai/app";

export default testFromDataset({
  fetchDataset: async () => {
    // get dataset from external data-source
    return dataset;
  },
  testCase: (item) => {
    // return a test case for each item in the dataset
    return {
      input: {
        // input to your agent
        userMessage: item.userMessage,
      },
      tags: {
        // tags to help categorize the test case
        intent: item.tags.intent,
      },
      metrics: [
        // different metrics to evaluate the response
        containsAllEvalMetric({
          substrings: item.evals.containsAny,
        }),
        levensteinEvalMetric({
          expected: item.evals.similarityReference,
        }),
      ],
    };
  },
});

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Metrics

We provide a set of metrics out of the box but you can also create your own custom metrics. Here’s a list of metrics we provide:
Metric NameDescription
containsAllEvalMetricChecks if the response contains the provided substring
containsAnyEvalMetricChecks if the response contains any of the provided substrings
exactMatchEvalMetricCheck if the response is contains the exact string
levensteinEvalMetricNLP Similarity based metrics that checks the Levenstein distance
rougeLCSSimilarityEvalMetricSimilarity metrics for sentence structure (Learn more)
rougeNGramSimilarityEvalMetricSimilarity metrics at words and phrase levels (Learn more)
rougeSkipBigramSimilarityEvalMetricCaptures more flexible phrase structures, reflecting coherence in non-contiguous word patterns (Learn more)

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System Metrics

You can measure system metrics such as latency, cost, and more. To measure a specific metrics, you need to add the metric to your agent’s response.metadata. Here’s an example tracking total cost: 
const handler: Chat = async (params) => {
  // your LLM application logic
  return {
    message: response.message,
    metadata: {
      [ResponseMetadataKey.TotalCost]: response.usage?.total_tokens,
    },
  };
};
You can add the following system metrics as part of your Chat handler:
  • ResponseMetadataKey.TotalCost
  • ResponseMetadataKey.InputTokens
  • ResponseMetadataKey.OutputTokens
  • ResponseMetadataKey.TotalTokens
The following system metrics are automatically tracked:
  • Execution Time

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Custom Metrics

You can create your own metrics by providing an EvalMetric object. Here’s an example of a custom metric that checks if the response length is within a specific range: 
import { EvalMetric } from "@palico-ai/app";

export const strLengthEvalMetric = (min: number, max: number) => {
  return {
    label: "Str Length",
    async evaluate(request: AgentRequestContent, response: AgentResponse): Promise<number> {
      const length = response.length;
      if (length >= min && length <= max) {
        return {
          score: 1,
        }
      }
      return {
        score: 0,
        reason: `Expected length between ${min} and ${max} but got ${length}`,
      }
    },
  }
}
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