Add progress hook (and example usage in test) for calibrate
#445
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This small PR addresses a comment in #444 by @fivegrant about how the progress hook for
calibrate
went missing after the refactoring PR in #431 . Here, we implement a progress hook by calling a user-provided function of the iteration idi
and theloss
, which the user can make stateful. In the tests we show an example of a progress hook that logs the iteration ids and losses, and stores them as an attribute.