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

import torch

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


def median_absolute_percentage_error_compute_fn(y_pred, y):
    e = torch.abs(y.view_as(y_pred) - y_pred) / torch.abs(y.view_as(y_pred))
    return 100.0 * torch.median(e).item()


[docs]class MedianAbsolutePercentageError(_BaseRegressionEpoch): r""" Calculates the Median Absolute Percentage Error: :math:`\text{MdAPE} = 100 \cdot \text{MD}_{j=1,n} \left( \frac{|A_j - P_j|}{|A_j|} \right)`, 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)`` or ``{'y_pred': y_pred, 'y': y}``. - `y` and `y_pred` must be of same shape `(N, )` or `(N, 1)` and of type `float32`. .. warning:: Current implementation stores all input data (output and target) in as tensors before computing a metric. This can potentially lead to a memory error if the input data is larger than available RAM. __ https://arxiv.org/abs/1809.03006 """ def __init__(self, output_transform=lambda x: x): super(MedianAbsolutePercentageError, self).__init__( median_absolute_percentage_error_compute_fn, output_transform )

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