Source code for dowhy.do_samplers.weighting_sampler

from dowhy.do_sampler import DoSampler
from dowhy.utils.propensity_score import propensity_of_treatment_score, state_propensity_score
import numpy as np


[docs]class WeightingSampler(DoSampler): def __init__(self, data, *args, params=None, variable_types=None, num_cores=1, keep_original_treatment=False, causal_model=None, **kwargs): """ g, df, data_types """ super().__init__(data, params=params, variable_types=variable_types, num_cores=num_cores, keep_original_treatment=keep_original_treatment, causal_model=causal_model) self.logger.info("Using WeightingSampler for do sampling.") self.logger.info("Caution: do samplers assume iid data.") self.point_sampler = False
[docs] def make_treatment_effective(self, x): to_sample = self._df.copy() if not self.keep_original_treatment: for treatment, value in x.items(): to_sample = to_sample[to_sample[treatment] == value] self._df = to_sample
[docs] def disrupt_causes(self): self._df['propensity_score'] = state_propensity_score(self._data, self._target_estimand.backdoor_variables, self._treatment_names, variable_types=self._variable_types) self._df['weight'] = self.compute_weights()
[docs] def sample(self): self._df = self._df.sample(len(self._data), replace=True, weights=self._df['weight']) self._df.index = self._data.index
[docs] def compute_weights(self): weights = 1. / self._df['propensity_score'] return weights