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Bugfix: handle case where 'losses' is a list of tensors #1357

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TeodorChiaburu
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Description

This PR fixes an issue I came across when applying NHiTS and TFT on my use case, namely that losses can be tensors within a list. In that case, the function mask_losses will fail. It is just a one-liner in base_metrics.py.

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Think this might need some rework. selecting the first loss might make the function work but if a list goes in, a list should go out

@@ -822,6 +822,9 @@ def mask_losses(self, losses: torch.Tensor, lengths: torch.Tensor, reduction: st
"""
if reduction is None:
reduction = self.reduction

if isinstance(losses, list): losses = losses[0]
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Should that not be something like
losses = [self.mask_losses(loss, lengths, reduction=reduction) for loss in losses]?

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jdb78 commented Sep 10, 2023

BTW: Would be great to have a test for this!

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