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### `tf.assert_variables_initialized(var_list=None)` {#assert_variables_initialized}
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NOTE: This function is obsolete and will be removed in 6 months.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.
Note: This function is implemented by trying to fetch the values of the
variables. If one of the variables is not initialized a message may be
logged by the C++ runtime. This is expected.
##### Args:
* <b>`var_list`</b>: List of `Variable` objects to check. Defaults to the
value of `all_variables().`
##### Returns:
An Op, or None if there are no variables.
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