birdgame 0.2.1

Utilities to help play the Bird Game at crunchdao.com

birdgame

Utilities for the Bird Game at crunchdao.com. Your task is to track the dove location.

Install

pip install birdgame

Visualize the challenge

Run animatebirds.py to get a quick sense.

Create your Tracker

To create your tracker, you need to define a class that implements the TrackerBase interface. Specifically, your class must implement the following methods:

1. tick(self, payload, performance_metrics)
   This method is called at every time step to process new payloads. Use this method to update your internal state or logic as needed.

   Payload Example:

    {
      "falcon_location": 21.179864629354732,
      "time": 230.96231205799998,
      "dove_location": 19.164986723324326,
      "falcon_wingspan": 0.28467,
      "falcon_id": 1
    }
   

2. predict(self)
   This method should return your prediction of the dove's location at a future time step. Ensure that the return format complies with the density_pdf specification.

You can refer to the Tracker examples for guidance.

Check your Tracker performance

Add in an optional parameter called performance_metrics to your tick method to obtain a dictionary of your performance metrics at each tick. This dictionary contains your wealth, likelihood_ewa, and recent_likelihood_ewa at the time of the current tick.

Usage Example

def tick(self, payload, performance_metrics):
    print(f"performance_metrics: {performance_metrics}")

You can find this implemented in the Quickstarter Notebooks and in the Example Models

Warm up your Tracker

You can implement a warm up period for your Tracker. During this period, your model is trained on the data without changing wealth.

The warm up period can also be triggered by checking a field in the performance metrics as shown below:

Usage Example:

class MyTracker(TrackerBase):

    def __init__(self, warmup=0):
        self.warmup_cutoff = warmup
        self.tick_count = 0
    
    def tick(self, payload, performance_metrics):
        # Process the payload and update internal state

        # To trigger a warm up based on a specific performance metric:
        recent_likelihood_ewa = performance_metrics['recent_likelihood_ewa']
        total_wealth = performance_metrics['wealth']
        if (recent_likelihood_ewa < 1.1 or total_wealth < 1000):
            self.tick_count = 0

        self.tick_count += 1
    
    def predict(self):
        # Return the predicted dove location
        if self.tick_count < self.warmup_cutoff:
            return None
        pass

To see this integrated into the example models, you can refer to the (commented out code in) Quickstarter Notebooks and the Example Models.

Challenge your Tracker against the benchmark

To compare your Tracker's performance against the benchmark Tracker, use the test_run method provided in the TrackerBase class. This method evaluates your Tracker's efficiency over a series of time steps using density_pdf scoring. A higher score reflects more accurate predictions.

Usage Example:

from birdgame.tracker import TrackerBase

class MyTracker(TrackerBase):
    def tick(self, payload, performance_metrics):
        # Process the payload and update internal state
        pass
   
    def predict(self):
        # Return the predicted dove location
        pass
   
# Instantiate your Tracker
tracker = MyTracker()

# Run the test to compare against the benchmark Tracker
tracker.test_run(
    live=True, # Set to True to use live streaming data; set to False to use data from a CSV file
    step_print=1000 # Print the score and progress every 1000 steps
)

Tracker examples

See Tracker examples. There are:

• Quickstarter Notebooks
• Self-contained examples
• Examples that build on provided classes

or Trackers (Self-contained trackers)

Take your pick!

General Bird Game Advice

The Bird Game challenges you to predict the dove's location using probabilistic forecasting.

Probabilistic Forecasting

Probabilistic forecasting provides a distribution of possible future values rather than a single point estimate, allowing for uncertainty quantification. Instead of predicting only the most likely outcome, it estimates a range of potential outcomes along with their probabilities by outputting a probability distribution.

A probabilistic forecast models the conditional probability distribution of a future value $(Y_t)$ given past observations $(\mathcal{H}_{t-1})$. This can be expressed as:

$$P(Y_t \mid \mathcal{H}_{t-1})$$

where $(\mathcal{H}_{t-1})$ represents the historical data up to time $(t-1)$. Instead of a single prediction $(\hat{Y}t)$, the model estimates a full probability distribution $(f(Y_t \mid \mathcal{H}{t-1}))$, which can take different parametric forms, such as a Gaussian:

$$Y_t \mid \mathcal{H}_{t-1} \sim \mathcal{N}(\mu_t, \sigma_t^2)$$

where $(\mu_t)$ is the predicted mean and $(\sigma_t^2)$ represents the uncertainty in the forecast.

Probabilistic forecasting can be handled through various approaches, including variance forecasters, quantile forecasters, interval forecasters or distribution forecasters, each capturing uncertainty differently.

For example, you can try to forecast the target location by a gaussian density function (or a mixture), thus the model output follows the form:

{"density": {
                "name": "normal",
                "params": {"loc": y_mean, "scale": y_var}
            },
 "weight": weight
}

A mixture density, such as the gaussion mixture $\sum_{i=1}^{K} w_i \mathcal{N}(Y_t | \mu_i, \sigma_i^2)$ allows for capturing multi-modal distributions and approximate more complex distributions.

Additional Resources

• Literature
• Useful Python packages

Column Names and Tool Tips

Column	Description
Model
Active Wealth	The wealth that is currently at risk.
Cumulative Prize	Active Wealth is prevented from growing too large by withdrawals (prizes).
Total Wealth	The sum of cumulative prizes and active wealth, and thus a measure of overall success.
Longevity	The number of observations since a player entered the game.
Log Likelihood	An exponentially weighted average of ex-post log-likelihood.