Depends an awful lot on how you define that term *assault rifle.*
Initially Fedorov wanted to call the class of weapons to which his new gun belonged ручное ружьё-пулемет (lit. "handheld light-machine-gun", i.e. a lighter class than ружьё-пулемет which denoted light machine guns like the Madsen), which reflected his tactical thinking behind the development of the weapon. This designation appeared in a September 1916 article in the journal of the Artillery Commission. Fedorov's superior, General N.M. Filatov (Н.М. Филатов), is credited for introducing the much shorter term "avtomat" for the gun—a neologism derived from the Greek word 'automaton' and synonymous with the English word "automatic", this is the one that stuck. Written records of this new term being applied to the gun date to 1919.
In contemporary Russian terminology, the word "avtomat" denotes assault rifle, although historically the term has had a broader meaning.
Interesting. Had never heard of those. The article doesn’t indicate they were deployed a whole lot, but it would seem the classic assault rifle definition of lower powered cartridge firing with select fire option.