I'm going to expose my ignorance here, but I thought mAh/Ah was not a good measure for comparing storage of quite different devices, because it doesn't take into account voltage. This is fine for comparing Li-ion devices, because they use the same voltage, but I understood that using watt-hours was therefore more appropriate for apples-to-apples comparisons for devices with different wattages.

Am I missing something? Does the CPU/GPU/APU doing this calculation on servers/PCs run the same wattage as mobile devices?

Don’t you ignore the energy used to train the models? I don’t know how much is that “per image”, but it should be included (and if it shouldn’t, we should know why it is negligible).

I’m not sure it will be as high as a full charge of a phone, but it’s incomplete without the resources needed for collecting data and training the model.

Current over time (ampere hours) and power over time (watt hours) are two different things.

You should be using KWh.