Fix the default value doc string of global_step in contrib.slim #18313
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This PR is to fix the default value doc string of global_step in contrib.slim.
As contrib.slim.learning.L428 shown, If global_step was left as
_USE_GLOBAL_STEP
, thentf.contrib.framework.global_step()
is used instead ofslim.variables.global_step()
according to contrib.training.training.L386As contrib.slim.learning.L657 shown, If global_step was left as
None
, thentraining_util.get_or_create_global_step()
is used instead ofslim.variables.get_or_create_global_step()
;