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Returns an Op to check if variables are initialized.



NOTE: This function is obsolete and will be removed in 6 months. Please change your implementation to use report_uninitialized_variables().

When run, the returned Op will raise the exception FailedPreconditionError if any of the variables has not yet been initialized.


  • var_list: List of Variable objects to check. Defaults to the value of global_variables().


An Op, or None if there are no variables.

NOTE The output of this function should be used. If it is not, a warning will be logged. To mark the output as used, call its .mark_used() method.