The limitations of chip-processing abilities and the data sets used in the artificial neural networks that ran them made Hinton's and his colleagues' theories impractical and ahead of their time.
Some doctors who attended the course thought the work sheets were fine in theory, but impractical: too time-consuming for doctors and too complicated for patients.
For instance, Suppes understands first-order predicate logic, with its "linguistic" rather than "set-theoretical" entities, as "utterly impractical" for the formalization of "theories with more complicated structures like probability theory" (Suppes 1957, 232, 248 9; cf. Suppes 2002).
Too many of the solutions currently offered, while sound in theory, are often impractical in reality: Smaller class size has been suggested as a way of providing better education, but this will not happen universally because of the high expense and because of the shortage of space to house new classes.
This subjective test is impractical for advancing scientific research, which requires theories, models and algorithms in addition to empirical evaluations.
(A gastric band is reversible; a gastric bypass can be undone – in theory – but "it's dangerous and impractical to do so", according to one surgeon).
Economists have proposed innovative instruments for nonpoint pollution that have good efficiency properties in theory, but which may be highly impractical in real-world settings.
For micro-/nanoscale systems, however, macroscopic theory is inadequate, whereas microscopic theory may be impractical because of computational load.
One side cannot prove or disprove the other theory to its opponents' satisfaction, rendering continued quarreling impractical and wasteful.
While the foregoing theory is simple, the lengthy explicit mathematical expressions become impractical if the total number of spring mass systems is larger than "two".
