Hi there,
This is a fairly common question. The Pynq-Z2 has a 32-bit arm processor on it, so if you need to run tensorflow on it you need to compile it from source or find a project that ships these binaries for that architecture. I assume if you want something that works for a raspberry pi, for example, shouldn’t be too far fetched to port into the Pynq-Z2.
Here are some relevant posts from the past Tensorflow and keras on pynq z2. Hopefully one of the links in there will prove to be useful.
Thanks
Shawn