history.py 文件源码

def get_nr_particles_per_population(self) -> pd.Series:
        """

        Returns
        -------
        nr_particles_per_population: pd.DataFrame
            A pandas DataFrame containing the number
            of particles for each population

        """
        query = (self._session.query(Population.t)
                 .join(ABCSMC)
                 .join(Model)
                 .join(Particle)
                 .filter(ABCSMC.id == self.id))
        df = pd.read_sql_query(query.statement, self._engine)
        nr_particles_per_population = df.t.value_counts().sort_index()
        return nr_particles_per_population