# BNNSGraphContextSetStreamingAdvanceCount(_:_:) Sets the streaming advancement amount for cases with dynamically shaped inputs. ``` func BNNSGraphContextSetStreamingAdvanceCount(_ context: bnns_graph_context_t, _ advance_count: Int) -> Int32 ``` ## Parameters `context` The graph context. `advance_count` An integer value that specifies the number of elements by which the function advances the internal state pointer. ## Discussion BNNS can’t unambiguously determine the streaming advancement size for models you compile with the `BNNSOption` attribute `StateMode=Streaming` in an enabled state, where `slice_update` operations use an update parameter of dynamic shape. Call this function before calling [`BNNSGraphContextExecute(_:_:_:_:_:_:)`](/documentation/Accelerate/BNNSGraphContextExecute(_:_:_:_:_:_:)) to set the advancement size for each frame. This function advances the internal state pointer by `advance_count` elements in the streaming dimension before returning from [`BNNSGraphContextExecute(_:_:_:_:_:_:)`](/documentation/Accelerate/BNNSGraphContextExecute(_:_:_:_:_:_:)). > Note: The BNNS streaming APIs do not support models that require different advancement amounts for different states. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)