pyFTS/pyFTS/seasonal/SeasonalIndexer.py

import numpy as np
import pandas as pd
from enum import Enum
from pyFTS.seasonal import common


class SeasonalIndexer(object):
    """
    Seasonal Indexer. Responsible to find the seasonal index of a data point inside its data set
    """
    def __init__(self,num_seasons, **kwargs):
        self.num_seasons = num_seasons
        self.name = kwargs.get("name","")

    def get_season_of_data(self,data):
        pass

    def get_season_by_index(self,inde):
        pass

    def get_data_by_season(self, data, indexes):
        pass

    def get_index_by_season(self, indexes):
        pass

    def get_data(self, data):
        pass

    def get_index(self, data):
        pass


class LinearSeasonalIndexer(SeasonalIndexer):
    def __init__(self,seasons,units,ignore=None, **kwargs):
        super(LinearSeasonalIndexer, self).__init__(len(seasons), **kwargs)
        self.seasons = seasons
        self.units = units
        self.ignore = ignore

    def get_season_of_data(self,data):
        return self.get_season_by_index(np.arange(0, len(data)).tolist())

    def get_season_by_index(self,index):
        ret = []
        if not isinstance(index, (list, np.ndarray)):
            if self.num_seasons == 1:
                season = (index // self.units[0]) % self.seasons[0]
            else:
                season = []
                for ct, seasonality in enumerate(self.seasons, start=0):
                    tmp = (index // self.units[ct]) % self.seasons[ct]
                    if not self.ignore[ct]:
                        season.append(tmp)
            ret.append(season)
        else:
            for ix in index:
                if self.num_seasons == 1:
                    season = (ix  // self.units[0]) % self.seasons[0]
                else:
                    season = []
                    for ct, seasonality in enumerate(self.seasons, start=0):
                        tmp = (ix  // self.units[ct]) % self.seasons[ct]
                        if not self.ignore[ct]:
                            season.append(tmp)
                ret.append(season)

        return ret

    def get_index_by_season(self, indexes):
        ix = 0;

        for count,season in enumerate(self.seasons):
            ix += season*(indexes[count])

        #ix += indexes[-1]

        return ix

    def get_data(self, data):
        return data


class DataFrameSeasonalIndexer(SeasonalIndexer):
    def __init__(self,index_fields,index_seasons, data_fields,**kwargs):
        super(DataFrameSeasonalIndexer, self).__init__(len(index_seasons), **kwargs)
        self.fields = index_fields
        self.seasons = index_seasons
        self.data_fields = data_fields

    def get_season_of_data(self,data):
        #data = data.copy()
        ret = []
        for ix in data.index:
            season = []
            for c, f in enumerate(self.fields, start=0):
                if self.seasons[c] is None:
                    season.append(data[f][ix])
                else:
                    a = data[f][ix]
                    season.append(a // self.seasons[c])
            ret.append(season)
        return ret

    def get_season_by_index(self,index):
        raise Exception("Operation not available!")

    def get_data_by_season(self, data, indexes):
        for season in indexes:
            for c, f in enumerate(self.fields, start=0):
                if self.seasons[c] is None:
                    data = data[data[f]== season[c]]
                else:
                    data = data[(data[f] // self.seasons[c]) == season[c]]
        return data[self.data_fields]

    def get_index_by_season(self, indexes):
        raise Exception("Operation not available!")

    def get_data(self, data):
        return data[self.data_fields].tolist()

    def set_data(self, data, value):
        data.loc[:,self.data_fields] = value
        return data


class DateTimeSeasonalIndexer(SeasonalIndexer):
    def __init__(self,date_field, index_fields, index_seasons, data_fields,**kwargs):
        super(DateTimeSeasonalIndexer, self).__init__(len(index_seasons), **kwargs)
        self.fields = index_fields
        self.seasons = index_seasons
        self.data_fields = data_fields
        self.date_field = date_field

    def get_season_of_data(self, data):

        ret = []

        if isinstance(data, pd.DataFrame):
            for ix in data.index:
                date = data[self.date_field][ix]
                season = []
                for c, f in enumerate(self.fields, start=0):
                    tmp = common.strip_datepart(date, f)
                    if self.seasons[c] is not None:
                        tmp = tmp // self.seasons[c]
                    season.append(tmp)
                ret.append(season)

        elif isinstance(data, pd.Series):
            date = data[self.date_field]
            season = []
            for c, f in enumerate(self.fields, start=0):
                season.append(self.strip_datepart(date, f, self.seasons[c]))
            ret.append(season)

        return ret

    def get_season_by_index(self, index):
        raise Exception("Operation not available!")

    def get_data_by_season(self, data, indexes):
        raise Exception("Operation not available!")

    def get_index_by_season(self, indexes):
        raise Exception("Operation not available!")

    def get_data(self, data):
        return data[self.data_fields].tolist()

    def get_index(self, data):
        return data[self.date_field].tolist() if isinstance(data, pd.DataFrame) else data[self.date_field]

    def set_data(self, data, value):
        raise Exception("Operation not available!")