Get the aggregated gradients for op. Args: grads: The map of memoized gradients. op: The op to get gradients for. loop_state: An object for maintaining the state of the while loops in the graph. It is of type ControlFlowState. None if the graph contains
(grads, op, loop_state, aggregation_method=None)
source not stored for this graph (policy: none)
no test coverage detected