Specify execution a Composition in interpreted or one of ithe compiled modes.
These are used to specify the execution_mode argument of a Composition’s execute,
run, and learn methods. See Compiled Modes under Compilation for additional details concerning
use of each mode by a Composition.
For clarity, this mode should only be used when executing an AutodiffComposition; using it
with a standard Composition is possible, but it will not have the expected effect of executing
its learn method using PyTorch.