Class: Experiment

An experiment is a collection of logged events, such as model inputs and outputs, which represent a snapshot of your application at a particular point in time. An experiment is meant to capture more than just the model you use, and includes the data you use to test, pre- and post- processing code, comparison metrics (scores), and any other metadata you want to include.

Experiments are associated with a project, and two experiments are meant to be easily comparable via their inputs. You can change the attributes of the experiments in a project (e.g. scoring functions) over time, simply by changing what you log.

You should not create Experiment objects directly. Instead, use the braintrust.init() method.

Hierarchy

ObjectFetcher<ExperimentEvent>

↳ Experiment

Accessors

id

• get id(): Promise<string>

Returns

Promise<string>

Overrides

ObjectFetcher.id

name

• get name(): Promise<string>

Returns

Promise<string>

project

• get project(): Promise<ObjectMetadata>

Returns

Promise<ObjectMetadata>

Constructors

constructor

• new Experiment(lazyMetadata, dataset?): Experiment

Parameters

Name	Type
`lazyMetadata`	`LazyValue`<`ProjectExperimentMetadata`>
`dataset?`	`AnyDataset`

Returns

Experiment

Overrides

ObjectFetcher<ExperimentEvent>.constructor

Methods

[asyncIterator]

▸ [asyncIterator](): AsyncIterator<WithTransactionId<ExperimentEvent>, any, undefined>

Returns

AsyncIterator<WithTransactionId<ExperimentEvent>, any, undefined>

Inherited from

ObjectFetcher.[asyncIterator]

clearCache

▸ clearCache(): void

Returns

void

Inherited from

ObjectFetcher.clearCache

close

▸ close(): Promise<string>

This function is deprecated. You can simply remove it from your code.

Returns

Promise<string>

fetch

▸ fetch(): AsyncGenerator<WithTransactionId<ExperimentEvent>, any, unknown>

Returns

AsyncGenerator<WithTransactionId<ExperimentEvent>, any, unknown>

Inherited from

ObjectFetcher.fetch

fetchBaseExperiment

▸ fetchBaseExperiment(): Promise<null | { id: any ; name: any }>

Returns

Promise<null | { id: any ; name: any }>

fetchedData

▸ fetchedData(): Promise<WithTransactionId<ExperimentEvent>[]>

Returns

Promise<WithTransactionId<ExperimentEvent>[]>

Inherited from

ObjectFetcher.fetchedData

flush

▸ flush(): Promise<void>

Flush any pending rows to the server.

Returns

Promise<void>

getState

▸ getState(): Promise<BraintrustState>

Returns

Promise<BraintrustState>

Overrides

ObjectFetcher.getState

log

▸ log(event, options?): string

Log a single event to the experiment. The event will be batched and uploaded behind the scenes.

Parameters

Name	Type	Description
`event`	`Readonly`<`ExperimentLogFullArgs`>	The event to log.
`options?`	`Object`	Additional logging options
`options.allowLogConcurrentWithActiveSpan?`	`boolean`	in rare cases where you need to log at the top level separately from an active span on the experiment, set this to true. :returns: The `id` of the logged event.

Returns

string

logFeedback

▸ logFeedback(event): void

Log feedback to an event in the experiment. Feedback is used to save feedback scores, set an expected value, or add a comment.

Parameters

Name	Type
`event`	`LogFeedbackFullArgs`

Returns

void

startSpan

▸ startSpan(args?): Span

Lower-level alternative to traced. This allows you to start a span yourself, and can be useful in situations where you cannot use callbacks. However, spans started with startSpan will not be marked as the "current span", so currentSpan() and traced() will be no-ops. If you want to mark a span as current, use traced instead.

See traced for full details.

Parameters

Name	Type
`args?`	`StartSpanArgs`

Returns

Span

summarize

▸ summarize(options?): Promise<ExperimentSummary>

Summarize the experiment, including the scores (compared to the closest reference experiment) and metadata.

Parameters

Name	Type	Description
`options`	`Object`	Options for summarizing the experiment.
`options.comparisonExperimentId?`	`string`	The experiment to compare against. If None, the most recent experiment on the origin's main branch will be used.
`options.summarizeScores?`	`boolean`	Whether to summarize the scores. If False, only the metadata will be returned.

Returns

Promise<ExperimentSummary>

A summary of the experiment, including the scores (compared to the closest reference experiment) and metadata.

traced

▸ traced<R>(callback, args?): R

Create a new toplevel span underneath the experiment. The name defaults to "root".

See Span.traced for full details.

Type parameters

Name
`R`

Parameters

Name	Type
`callback`	(`span`: `Span`) => `R`
`args?`	`StartSpanArgs` & `SetCurrentArg`

Returns

R

version

▸ version(): Promise<undefined | string | bigint>

Returns

Promise<undefined | string | bigint>

Inherited from

ObjectFetcher.version

Properties

dataset

• Optional Readonly dataset: AnyDataset

kind

• kind: "experiment"

Node.js Logger