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Verifies that a global step tensor is valid or gets one if None is given.

If global_step_tensor is not None, check that it is a valid global step tensor (using assert_global_step). Otherwise find a global step tensor using get_global_step and return it.

graph The graph to find the global step tensor for.
global_step_tensor The tensor to check for suitability as a global step. If None is given (the default), find a global step tensor.

A tensor suitable as a global step, or None if none was provided and none was found.