level module¶

A level $ell$ for the MLMC algorithm.

class gemseo_umdo.statistics.multilevel.mlmc.level.Level(model, cost=None, n_cost_estimation_samples=1, n_initial_samples=10, sampling_ratio=2.0)[source]

Bases: object

A level $ell$ for the MLMC algorithm.

Parameters:

model (MDOFunction) –
cost (float | None) –
n_cost_estimation_samples (int) –

By default it is set to 1.
n_initial_samples (int) –

By default it is set to 10.
sampling_ratio (float) –

By default it is set to 2.0.

cost: float | None = None: The cost $mathcal{C}_ell$ to evaluate $f_ell$, if known.

model: MDOFunction

The model $f_ell$ to sample.

This model can be set from any callable taking a NumPy array of float numbers as input and outputting either a float number or a NumPy array of float numbers.

n_cost_estimation_samples: int = 1

The number of $f_ell$ calls to estimate $mathcal{C}_ell$.

It will be used only if cost is None.

n_initial_samples: int = 10: The number of samples $n_ell$ at the first iteration of the algorithm.

sampling_ratio: float = 2.0: The number $r_ell$ by which $n_ell$ is increased.