I am trying to figure out the concept of "input space" in the context of machine learning.
Wikipedia is using this term and does not give a definition or explanation of it.
This post gives a definition of "input space". (Please give a more appropriate definition or explanation if needed)
The "input space" is just all the possible inputs.
Consider the Iris flower data set, is the "input space" of this dataset $$R^4$$ or something like $$X^4, 0<X<R$$
