synthefy 2.0.5

Python client for the Synthefy API forecasting service

Synthefy Python Client

A Python client for the Synthefy API forecasting service. This package provides an easy-to-use interface for making time series forecasting requests with both synchronous and asynchronous support.

Features

• Sync & Async Support: Separate clients for synchronous and asynchronous operations
• Professional Error Handling: Comprehensive exception hierarchy with detailed error messages
• Retry Logic: Built-in exponential backoff for transient errors (rate limits, server errors)
• Context Managers: Automatic resource cleanup with with and async with statements
• Pandas Integration: Built-in support for pandas DataFrames
• Type Safety: Full type hints and Pydantic validation

Installation

pip install synthefy

Quick Start

Basic Usage

from synthefy import SynthefyAPIClient, SynthefyAsyncAPIClient
import pandas as pd

# Synchronous client
with SynthefyAPIClient(api_key="your_api_key_here") as client:
    # Make requests...
    pass

# Asynchronous client
async with SynthefyAsyncAPIClient() as client:  # Uses SYNTHEFY_API_KEY env var
    # Make async requests...
    pass

Making a Forecast Request

from synthefy import SynthefyAPIClient
import pandas as pd
import numpy as np

# Create sample data with numeric metadata
history_data = {
    'date': pd.date_range('2024-01-01', periods=100, freq='D'),
    'sales': np.random.normal(100, 10, 100),
    'store_id': 1,
    'category_id': 101,
    'promotion_active': 0
}

target_data = {
    'date': pd.date_range('2024-04-11', periods=30, freq='D'),
    'sales': np.nan,  # Values to forecast
    'store_id': 1,
    'category_id': 101,
    'promotion_active': 1  # Promotion active in forecast period
}

history_df = pd.DataFrame(history_data)
target_df = pd.DataFrame(target_data)

# Synchronous forecast
with SynthefyAPIClient() as client:
    forecast_dfs = client.forecast_dfs(
        history_dfs=[history_df],
        target_dfs=[target_df],
        target_col='sales',
        timestamp_col='date',
        metadata_cols=['store_id', 'category_id', 'promotion_active'],
        leak_cols=[],
        model='sfm-moe-v1'
    )

# Result is a list of DataFrames with forecasts
forecast_df = forecast_dfs[0]
print(forecast_df[['timestamps', 'sales']].head())

Asynchronous Usage

import asyncio
from synthefy.api_client import SynthefyAsyncAPIClient

async def main():
    async with SynthefyAsyncAPIClient() as client:
        # Single async forecast
        forecast_dfs = await client.forecast_dfs(
            history_dfs=[history_df],
            target_dfs=[target_df],
            target_col='sales',
            timestamp_col='date',
            metadata_cols=['store_id', 'category_id', 'promotion_active'],
            leak_cols=[],
            model='sfm-moe-v1'
        )

        # Concurrent forecasts for multiple datasets
        tasks = []
        for i in range(3):
            # Create variations of your data
            modified_history = history_df.copy()
            modified_target = target_df.copy()
            modified_history['store_id'] = i + 1
            modified_target['store_id'] = i + 1

            task = client.forecast_dfs(
                history_dfs=[modified_history],
                target_dfs=[modified_target],
                target_col='sales',
                timestamp_col='date',
                metadata_cols=['store_id', 'category_id', 'promotion_active'],
                leak_cols=[],
                model='sfm-moe-v1'
            )
            tasks.append(task)

        # Execute all forecasts concurrently
        results = await asyncio.gather(*tasks)

        for i, forecast_dfs in enumerate(results):
            print(f"Forecast for store {i+1}: {len(forecast_dfs[0])} predictions")

# Run the async function
asyncio.run(main())

Backtesting

import asyncio
import pandas as pd
import numpy as np
from synthefy.data_models import ForecastV2Request
from synthefy.api_client import SynthefyAsyncAPIClient

async def main():

    # Create sample time series data
    dates = pd.date_range('2023-01-01', '2023-12-31', freq='D')
    data = {
        'date': dates,
        'sales': np.random.normal(100, 10, len(dates)),
        'store_id': 1,
        'category_id': 101,
        'promotion_active': np.random.choice([0, 1], len(dates), p=[0.7, 0.3])
    }
    df = pd.DataFrame(data)

    print(f"Created dataset with {len(df)} rows from {df['date'].min()} to {df['date'].max()}")

    # Use from_dfs_pre_split for backtesting with date-based windows
    request = ForecastV2Request.from_dfs_pre_split(
        dfs=[df],
        timestamp_col='date',
        target_cols=['sales'],
        model='sfm-moe-v1',
        cutoff_date='2023-06-01',  # Start backtesting from June 1st
        forecast_window='7D',      # 7-day forecast windows
        stride='14D',              # Move forward 14 days between windows
        metadata_cols=['store_id', 'category_id', 'promotion_active'],
        leak_cols=['promotion_active']  # Promotion data may leak into target
    )

    print(f"Created {len(request.samples)} forecast windows for backtesting")
    print("Window details:")
    for i, sample in enumerate(request.samples):
        history_start = sample[0].history_timestamps[0]
        history_end = sample[0].history_timestamps[-1]
        target_start = sample[0].target_timestamps[0]
        target_end = sample[0].target_timestamps[-1]
        print(f"  Window {i+1}: History {history_start} to {history_end}, Target {target_start} to {target_end}")

    # Make async forecast request
    async with SynthefyAsyncAPIClient() as client:
        response = await client.forecast(request)

        print(f"\nBacktesting completed with {len(response.samples)} forecast windows")

        # Process results for each window
        for i, sample in enumerate(response.samples):
            print(f"Window {i+1}: {len(sample.history_timestamps)} history points, "
                f"{len(sample.target_timestamps)} target points")

            # Access forecast values
            if hasattr(sample, 'forecast_values') and sample.forecast_values:
                print(f"  Forecast values: {sample.forecast_values[:3]}...")  # First 3 values
asyncio.run(main())

Advanced Configuration

from synthefy import SynthefyAPIClient
from synthefy.api_client import BadRequestError, RateLimitError

# Client with custom configuration
with SynthefyAPIClient(
    api_key="your_key",
    timeout=600.0,  # 10 minutes
    max_retries=3,
    organization="your_org_id",
    base_url="https://custom.synthefy.com"  # For enterprise customers
) as client:
    try:
        # Per-request configuration
        forecast_dfs = client.forecast_dfs(
            history_dfs=[history_df],
            target_dfs=[target_df],
            target_col='sales',
            timestamp_col='date',
            metadata_cols=['store_id'],
            leak_cols=[],
            model='sfm-moe-v1',
            timeout=120.0,  # Override client timeout for this request
            idempotency_key="unique-request-id",  # Prevent duplicate processing
            extra_headers={"X-Custom-Header": "value"}
        )
    except BadRequestError as e:
        print(f"Invalid request: {e}")
        print(f"Status code: {e.status_code}")
        print(f"Request ID: {e.request_id}")
    except RateLimitError as e:
        print(f"Rate limited: {e}")
        # Client automatically retries with exponential backoff
    except Exception as e:
        print(f"Unexpected error: {e}")

API Reference

SynthefyAPIClient (Synchronous)

The synchronous client class for interacting with the Synthefy API.

Constructor Parameters

• api_key: Your Synthefy API key (can also be set via SYNTHEFY_API_KEY environment variable)
• timeout: Request timeout in seconds (default: 300.0 / 5 minutes)
• max_retries: Number of retries for transient errors (default: 2)
• base_url: API base URL (default: "https://prod.synthefy.com")
• organization: Optional organization ID for multi-tenant setups
• user_agent: Custom user agent string

Methods

• forecast(request, *, timeout=None, idempotency_key=None, extra_headers=None) -> ForecastV2Response
  • Make a direct forecast request with a ForecastV2Request object
• forecast_dfs(history_dfs, target_dfs, target_col, timestamp_col, metadata_cols, leak_cols, model) -> List[pd.DataFrame]
  • Convenience method for working directly with pandas DataFrames
• close(): Manually close the HTTP client
• Context manager support: Use with with SynthefyAPIClient() as client:

SynthefyAsyncAPIClient (Asynchronous)

The asynchronous client class for non-blocking operations and concurrent requests.

Constructor Parameters

Same as SynthefyAPIClient.

Methods

• async forecast(request, *, timeout=None, idempotency_key=None, extra_headers=None) -> ForecastV2Response
  • Async version of forecast method
• async forecast_dfs(history_dfs, target_dfs, target_col, timestamp_col, metadata_cols, leak_cols, model) -> List[pd.DataFrame]
  • Async version of forecast_dfs method
• async aclose(): Manually close the async HTTP client
• Async context manager support: Use with async with SynthefyAsyncAPIClient() as client:

Exception Hierarchy

All exceptions inherit from SynthefyError:

• APITimeoutError: Request timed out
• APIConnectionError: Network/connection issues
• APIStatusError: Base class for HTTP status errors
  • BadRequestError (400, 422): Invalid request data
  • AuthenticationError (401): Invalid API key
  • PermissionDeniedError (403): Access denied
  • NotFoundError (404): Resource not found
  • RateLimitError (429): Rate limit exceeded
  • InternalServerError (5xx): Server errors

Each status error includes:

• status_code: HTTP status code
• request_id: Request ID for debugging (if available)
• error_code: API-specific error code (if available)
• response_body: Raw response body

Configuration

Environment Variables

• SYNTHEFY_API_KEY: Your Synthefy API key

Support

For support and questions:

• Email: [e-mail]

License

MIT License - see LICENSE file for details.