Python (AI) SDK reference

Overview

This topic documents how to get started with the Python (AI) SDK, and links to reference information on all of the supported features.

Get started

LaunchDarkly AI SDKs interact with AI configs. AI configs are the LaunchDarkly resources that manage your AI prompts and model configurations.

You can use the Python (AI) SDK to customize your AI config based on the context that you provide. This means both the prompt and the model evaluation in your generative AI application are specific to each end user, at runtime. You can also use the AI SDKs to record metrics from your AI model generation, including duration and tokens.

Follow these instructions to start using the Python (AI) SDK in your Python application.

Understand version compatibility

The LaunchDarkly Python (AI) SDK is compatible with Python 3.8.0 and higher.

Install the SDK

First, install the AI SDK as a dependency in your application using your application's dependency manager. If you want to depend on a specific version, refer to the SDK releases page to identify the latest version.

Here's how:

pip install launchdarkly-server-sdk-ai
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Next, import the LaunchDarkly LDAIClient into your application code:

import ldclient
from ldclient import Context
from ldclient.config import Config
from ldai.client import LDAIClient
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Initialize the client

After you install and import the AI SDK, create a single, shared instance of LDAIClient. Specify your SDK key here to authorize your application to connect to a particular environment within LaunchDarkly.

Here's how:

ldclient.set_config(Config("sdk-key-123abc"))
aiclient = LDAIClient(ldclient.get())
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Configure the context

Next, configure the context that will use the AI config, that is, the context that will encounter generated AI content in your application. The context attributes determine which version of the AI config LaunchDarkly serves to the end user, based on the targeting rules in your AI config. If you are using template variables in the prompt in your AI config's versions, the context attributes also fill in values for the template variables.

Here's how:

context = Context.builder("context-key-123abc") \
    .set("firstName", "Sandy") \
    .set("lastName", "Smith") \
    .set("email", "sandy@example.com") \
    .set("groups", ["Google", "Microsoft"]) \
    .build()
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Customize an AI config

Then, use model_config to customize the AI config. This function returns the customized prompt and model. Customization means that any variables you include in the prompt when you define the AI config version have their values set to the context attributes and variables you pass to model_config. Then, you can pass the customized prompt directly to your AI.

The customization process within the AI SDK is similar to evaluating flags in one of LaunchDarkly's client-side, server-side, or edge SDKs, in that the SDK completes the customization without a separate network call.

Here's how:

fallback_value = {
  'model': { 'modelId': 'my-default-model', },
  'enabled': True,
}
config_value = aiclient.model_config('ai-config-key-123abc', context, fallback_value, { 'example_custom_variable': 'example_custom_value'})
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To learn more, read Customizing AI configs.

Record metrics from AI model generation

Finally, use one of the track_[model] functions to record metrics from your AI model generation.

Here's how:

tracker = config_value.tracker
completion = tracker.track_openai(
  # Pass in the result of the OpenAI operation.
  # When calling the OpenAI operation, use details from config_value.
  # For instance, you can pass config_value.config['model']['modelId']
  # and config_value.config['prompt'] to your specific OpenAI operation.
)
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Alternatively, you can use the SDK's other track* functions to record these metrics manually. You may need to do this if you are using a model for which the SDK does not provide a convenience track_[model] function. The track_[model] functions are expecting a response, so you may also need to do this if your application requires streaming.

To learn more, read Tracking AI metrics.

Supported features

This SDK supports the following features:

• Anonymous contexts
• Context configuration
• Customizing AI configs
• Private attributes
• Tracking AI metrics