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Source code for ignite.contrib.metrics.regression.geometric_mean_relative_absolute_error

from __future__ import division

import torch

from ignite.contrib.metrics.regression._base import _BaseRegression


[docs]class GeometricMeanRelativeAbsoluteError(_BaseRegression): r""" Calculates the Geometric Mean Relative Absolute Error: :math:`\text{GMRAE} = \exp(\frac{1}{n}\sum_{j=1}^n \ln\frac{|A_j - P_j|}{|A_j - \bar{A}|})` where :math:`A_j` is the ground truth and :math:`P_j` is the predicted value. More details can be found in `Botchkarev 2018`__. - `update` must receive output of the form `(y_pred, y)`. - `y` and `y_pred` must be of same shape `(N, )` or `(N, 1)`. __ https://arxiv.org/abs/1809.03006 """ def reset(self): self._sum_y = 0.0 self._num_examples = 0 self._sum_of_errors = 0.0 def _update(self, output): y_pred, y = output self._sum_y += y.sum() self._num_examples += y.shape[0] y_mean = self._sum_y / self._num_examples numerator = torch.abs(y.view_as(y_pred) - y_pred) denominator = torch.abs(y.view_as(y_pred) - y_mean) self._sum_of_errors += torch.log(numerator / denominator).sum() def compute(self): if self._num_examples == 0: raise NotComputableError('GeometricMeanRelativeAbsoluteError must have at least ' 'one example before it can be computed.') return torch.exp(torch.mean(self._sum_of_errors / self._num_examples)).item()

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