@ptrblck thank you for your quick response!
The model was initially set to Inception v3 when the error first arose (after having it run successfully a number of times), but upon inspection the error also arises when running ResNet, VGG-Net, and AlexNet (all of which had also been run successfully).
I have tried to reduce batch size from 64 down to 32,16,8,4, etc… however the error persists; weirdly enough, while the ‘tried to allocate’ amount goes down (from 98.00MiB to, say, 16.00MiB) when the batch size is smaller, so does the amount of memory which is supposedly free (from 61.64MiB to, say, 12.00MiB), meaning there is still not enough free memory even when the batch size is reduced.