### `tf.train.get_global_step(graph=None)` {#get_global_step}

Get the global step tensor.

The global step tensor must be an integer variable. We first try to find it
in the collection `GLOBAL_STEP`, or by name `global_step:0`.

##### Args:


*  <b>`graph`</b>: The graph to find the global step in. If missing, use default graph.

##### Returns:

  The global step variable, or `None` if none was found.

##### Raises:


*  <b>`TypeError`</b>: If the global step tensor has a non-integer type, or if it is not
    a `Variable`.

