The meaning of hard

NP-hard, as opposed to NP, can solve a problem in a straightforward deterministic way, without a non-deterministic method.

The IT department is not only satisfied with the answer but also very pleased that you took the time to explain why AWS was necessary and did not just say, "The boss said so."

AI requires clear explanations and scientific proof of its necessity.

The last question comes up: what are mini-batches and how are they used?