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Fix memory leak in LTRTrainer._update_stats(). #313

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Fix memory leak in LTRTrainer._update_stats(). #313

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Capricorn231
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The method _update_stats() is called with val, which is a Tensor with gradients. When use with AverageMeter, the gradient graph will be accumulated during training and won't be released and collected by GC, causing significant memory leak.

@martin-danelljan
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val is not necessarily always a tensor. So we need to have a check if its actually a tensor first.

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@Capricorn231 @martin-danelljan