### `tf.contrib.util.stripped_op_list_for_graph(graph_def)` {#stripped_op_list_for_graph}
Collect the stripped OpDefs for ops used by a graph.
This function computes the `stripped_op_list` field of `MetaGraphDef` and
similar protos. The result can be communicated from the producer to the
consumer, which can then use the C++ function
`RemoveNewDefaultAttrsFromGraphDef` to improve forwards compatibility.
##### Args:
* `graph_def`: A `GraphDef` proto, as from `graph.as_graph_def()`.
##### Returns:
An `OpList` of ops used by the graph.
##### Raises:
* `ValueError`: If an unregistered op is used.