"classify without" is correct and usable in written English.
For example, you can use it in a sentence such as, "We must classify the items without bias."
As a result, documents are routinely classified without any explanation of how or why their disclosure would be harmful.
People were asked about their income and then classified (without their knowledge) as either poor or rich.
All sub-strategies could be classified without ambiguity.
Plants and algae were classified without a reference.
Figure 3 suggests that our test sets can be clustered according to motif discovery success, with one 8-test-set cluster consisting of promoters that were correctly classified without conservation, with the aid of alignment-free conservation, and by de novo motif discovery.
A surprising finding was that pre-exposure to a mild stressor was required to reveal susceptibility: when rats were classified without first exposing them to cat hair, only 1 of 71 animals met the susceptibility criteria, compared to 10 after such exposure (Figure 4).
As expected, MSS tumours could thus be classified without the need to refer to profiles from matching normal DNA.
After the above exclusion criteria were applied, 12,375 patients were classified without diabetes and were entered into the follow-up period.
