# setDynamicShapes(_:forFunction:) Specifies the dynamic shapes for a graph and, if possible, infers the output shapes. ``` func setDynamicShapes(_ shapes: [BNNSGraph.Shape], forFunction function: String? = nil) async throws -> [BNNSGraph.Shape] ``` ## Parameters `shapes` An array of input shapes in the same order as you pass to [`BNNSGraphContextExecute(_:_:_:_:_:_:)`](/documentation/Accelerate/BNNSGraphContextExecute(_:_:_:_:_:_:)). This function reads input shapes with a nonzero rank, and uses the constant or default value from the source model for input shapes with a zero rank. The function generates an error for shapes with a nonzero value that doesn’t match the source model. `function` The function. Specify as `nil` if the graph only contains one function. ## See Also [`func BNNSGraphContextSetDynamicShapes(bnns_graph_context_t, UnsafePointer?, Int, UnsafeMutablePointer) -> Int32`](/documentation/Accelerate/BNNSGraphContextSetDynamicShapes(_:_:_:_:)) Specifies the dynamic shapes for a graph and, if possible, infers, the output shapes. --- 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)