Use -only as a suffix to the attributively used noun.
- incremental-only learning
- batch-only learning
First of all, this is a somewhat strange question. In the area of computer science and artificial intelligence, there is a term called online machine learning. It includes several different types of algorithms for such learning, including incremental learning and batch learning.
The starting point of this question is that we can also use the words incrementable learning and batchable learning, to refer to the types of learning that are possible in certain situations.
But while incrementable is an understandably derived word using the normal rules of syntax, and Google Scholar shows 1,570 hits for it in scientific articles, it's not nearly as common as the simpler incremental. In comparison, Google Scholar shows 3,130,000 hits for incremental.
Comparing the two at Google Books Ngram Viewer, although incrementable exists, it is essentially a flat line at the bottom of a graph in comparison to incremental.
As uncommon as incrementable is, batchable is even less common.
Google Scholar shows only 329 hits for batchable in scientific articles as opposed to 4,150,000 hits for batch. Meanwhile, Google Books Ngram Viewer shows no results at all for batchable.
So, while both are understandable, and they have been used by some people, they are far from the common way of expressing such an idea.
It would be more common to rephrase the two:
- incrementable learning → capable of incremental learning
- batchable learning → capable of batch learning
The use of only as an adjective is well defined:
2 a : alone in a class or category : SOLE
// the only one left
// the only known species
// She's the only person you can really trust.
It can also be used as a modifier to an attribute noun that modifies another noun.
Depending on style and context, it can come before or after the main noun, and can be hyphenated, put in italics or quotes, or left just as it is:
- I am a dogs-only veterinarian surgeon.
- I am a "dogs only" veterinarian surgeon.
- I am a dogs only veterinarian surgeon.
- I am a veterinarian surgeon of dogs only.
But while using -only as a suffix for incremental and batch would technically work in the same way that incrementable and batchable would technically work (and I think it's the only reasonable way of satisfying what the question is looking for specifically), it suffers from the same problem as those other words: its use in this context is extremely uncommon.
I am unable to determine how to get Google Scholar to search only for hyphenated phrases (it ignores the hyphen), and I suspect it might not be possible. But, in a reversal of what I found with incrementable and batchable, Google Books Ngram Viewer shows no results at all for incremental-only, and it shows batch-only as a flat line at the bottom of a graph in comparison to batch.
As such, as with incrementable and batchable, it would be more common to reprhase the expressions:
- incremental-only learning → it can only learn incrementally
- batch-only learning → it can only learn in a batch