### `tf.contrib.graph_editor.add_control_inputs(op, cops)` {#add_control_inputs}

Add the control inputs cops to co.

Warning: this function is directly manipulating the internals of the tf.Graph.

##### Args:


*  <b>`op`</b>: a tf.Operation to which the control inputs are added.
*  <b>`cops`</b>: an object convertible to a list of `tf.Operation`.

##### Raises:


*  <b>`TypeError`</b>: if op is not a tf.Operation
*  <b>`ValueError`</b>: if any cop in cops is already a control input of op.

