qbrix 0.1.5

Python SDK for the qbrix multi-armed bandit platform

Python SDK for the qbrix platform.

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Typed sync and async clients for Qbrix — pool/experiment/gate management and the agent select/feedback loop.

Installation

pip install qbrix

Quick Start

Set your credentials as environment variables and call resources directly — no client instantiation needed:

export QBRIX_API_KEY="optiq_xxx"
export QBRIX_BASE_URL="https://api.qbrix.io"

import qbrix

# 1. Create a pool of arms (variants)
pool = qbrix.pool.create(
    name="homepage-buttons",
    arms=[{"name": "blue"}, {"name": "green"}, {"name": "red"}],
)

# 2. Create an experiment with a bandit policy
exp = qbrix.experiment.create(
    name="button-color-test",
    pool_id=pool.id,
    policy="BetaTSPolicy",
)

# 3. Select an arm for a user
result = qbrix.agent.select(
    experiment_id=exp.id,
    context={"id": "user-123", "metadata": {"country": "US"}},
)
print(result.arm.name)       # "green"
print(result.is_default)     # False (bandit selected)

# 4. Send feedback (reward) after observing the outcome
qbrix.agent.feedback(request_id=result.request_id, reward=1.0)

The system learns from every reward and adjusts future selections automatically.

Explicit Client

For full control over configuration or lifecycle (e.g. closing the HTTP connection, using a context manager), instantiate the client directly:

from qbrix import Qbrix

with Qbrix(api_key="optiq_xxx", base_url="https://api.qbrix.io") as client:
    pool = client.pool.create(
        name="homepage-buttons",
        arms=[{"name": "blue"}, {"name": "green"}, {"name": "red"}],
    )
    result = client.agent.select(experiment_id="exp-uuid", context={"id": "user-123"})
    client.agent.feedback(request_id=result.request_id, reward=1.0)

Async

from qbrix import AsyncQbrix

async with AsyncQbrix(api_key="optiq_xxx") as client:
    result = await client.agent.select(
        experiment_id="exp-uuid",
        context={"id": "user-456"},
    )
    await client.agent.feedback(request_id=result.request_id, reward=1.0)

Configuration

Constructor kwargs take priority over environment variables, which take priority over defaults.

export QBRIX_API_KEY="optiq_xxx"
export QBRIX_BASE_URL="https://api.qbrix.io"

from qbrix import Qbrix

client = Qbrix()  # picks up env vars automatically

Env Var	Default	Description
QBRIX_API_KEY	None	API key (optiq_xxx)
QBRIX_BASE_URL	http://localhost:8080	Proxy service URL
QBRIX_TIMEOUT	30.0	Request timeout (seconds)
QBRIX_MAX_RETRIES	3	Retry count on 429/5xx

Feature Gates

Attach a feature gate to control rollout before the bandit kicks in:

import qbrix

qbrix.gate.create(
    experiment_id=exp.id,
    enabled=True,
    rollout_percentage=80.0,
    default_arm_id=pool.arms[0].id,
    rules=[
        {"key": "plan", "operator": "==", "value": "enterprise", "arm_id": pool.arms[1].id},
    ],
)

# Gate-matched selections return is_default=True
result = qbrix.agent.select(
    experiment_id=exp.id,
    context={"id": "user-789", "metadata": {"plan": "enterprise"}},
)
print(result.is_default)  # True

Error Handling

import qbrix
from qbrix import NotFoundError, RateLimitedError

try:
    exp = qbrix.experiment.get("nonexistent-id")
except NotFoundError as e:
    print(f"Not found: {e.detail}")
except RateLimitedError as e:
    print(f"Retry after {e.retry_after}s")

Supported Policies

Policy	Type	Best For
BetaTSPolicy	Stochastic	Binary rewards (clicks, conversions)
GaussianTSPolicy	Stochastic	Continuous rewards
UCB1TunedPolicy	Stochastic	Theoretical regret guarantees
KLUCBPolicy	Stochastic	Binary rewards with tight bounds
MOSSPolicy	Stochastic	Fixed horizon problems
LinUCBPolicy	Contextual	Linear reward models with features
LinTSPolicy	Contextual	Linear models with uncertainty
EXP3Policy	Adversarial	Non-stationary environments
FPLPolicy	Adversarial	Follow the perturbed leader

License

MIT