Source code for review.scalar

# Copyright (c) 2016-2017 Junpei Kawamoto
# This file is part of rgmining-review.
# rgmining-review is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# rgmining-review is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with Foobar.  If not, see <>.
"""Implementations of scalar review and summary classes.
from __future__ import absolute_import
import numbers
import numpy as np

from review.base import Review
from review.base import Summary

[docs]class AverageReview(Review): """Scalar review. Args: v: a float value representing review score. The review score is a scalar value. """ __slots__ = ("_v") def __init__(self, v, date=None): """Construct average review class. Args: v: a float value representing review score. date: the date when this review was posted (default: None). """ super(AverageReview, self).__init__(date) if not isinstance(v, numbers.Number): raise TypeError("v ({0}) is not a scalar value.".format(type(v))) self._v = float(v) @property def score(self): """A float value representing score of this review. """ return self._v def __eq__(self, other): if not isinstance(other, AverageReview): return False return self.score == other.score def __add__(self, other): if not isinstance(other, AverageReview): raise TypeError( "other is {0}, not AverageReview".format(type(other))) return AverageReview(self.score + other.score) def __rmul__(self, other): if not isinstance(other, numbers.Number): raise TypeError( "other is {0}, not numbers.Number".format(type(other))) return AverageReview(other * self.score) def __str__(self): return str(self.score) def __hash__(self): return hash(self.score)
[docs]class AverageSummary(Summary): """Scalar summary. The summary is an average of given reviews. """ __slots__ = ("_v") # _v : an instance of AgerageReview def __init__(self, scores): if hasattr(scores, "__iter__"): v = np.mean(list(scores)) if isinstance(v, AverageReview): self._v = v else: self._v = AverageReview(v) elif isinstance(scores, AverageReview): self._v = scores else: self._v = AverageReview(scores)
[docs] def difference(self, r): """Difference between this summary and a given review. Args: r: a review. Returns: a non-negative float value or 0 representing the difference between this summary and the given value. """ if not isinstance(r, AverageReview): raise TypeError("r is {0}, not AverageReview".format(type(r))) return abs(self._v.score - r.score)
@property def score(self): """Float value representing this summary. """ return self._v.score @property def v(self): """Summary score. """ return self._v.score def __str__(self): return str(self._v) @classmethod
[docs] def review_class(cls): """A review class associated with this summary. """ return AverageReview