utils.py [289:299]:
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            scale = 1.0
            if reduction == "mean":
                L = len(targets[b])
                scale = 1.0 / L if L > 0 else scale
            elif reduction != "none":
                raise ValueError("invalid value for reduction '" + str(reduction) + "'")

            # Save for backward:
            losses[b] = g_loss
            scales[b] = scale
            emissions_graphs[b] = g_emissions
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utils.py [398:408]:
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            scale = 1.0
            if reduction == "mean":
                L = len(targets[b])
                scale = 1.0 / L if L > 0 else scale
            elif reduction != "none":
                raise ValueError("invalid value for reduction '" + str(reduction) + "'")

            # Save for backward:
            losses[b] = g_loss
            scales[b] = scale
            emissions_graphs[b] = g_emissions
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