Only log info about triggering once in the constructor.
Only log info about triggering once in the constructor.

This way, we don't see an overwhelming amount of info logs if the policy saver interval is set to -1.

PiperOrigin-RevId: 329398364
Change-Id: I3921960b6bd247eeaa3eaa7d4e935a466c703f5b

tensorflow/agents,tensorflow/agents