# BNNSGraphCompileFromFile(_:_:_:) Compiles a source mlmodelc file to a graph object. ``` func BNNSGraphCompileFromFile(_ filename: UnsafePointer, _ function: UnsafePointer?, _ options: bnns_graph_compile_options_t) -> bnns_graph_t ``` ## Parameters `filename` The path to the source mlmodelc file. `function` The name of the function that this operation compiles. Pass `nil` to specify that the operation compiles all the functions in the source file. `options` The compilation options. Pass `nil` to specify that the operation uses the default set of options. ## Return Value A compiled graph object. If the operation fails, the graph object’s [`data`](/documentation/Accelerate/bnns_graph_t/data) property is `nil`. ## Discussion Xcode automatically compiles a Core ML model package (files with an `.mlpackage` file extension) into an mlmodelc file. The following code compiles a [`bnns_graph_t`](/documentation/Accelerate/bnns_graph_t) instance from a file named `myModel.mlpackage` that you copy into the project. ```swift let options = BNNSGraphCompileOptionsMakeDefault() defer { BNNSGraphCompileOptionsDestroy(options) } guard let fileName = Bundle.main.url( forResource: "myModel", withExtension: "mlmodelc")?.path() else { fatalError() } let graph = BNNSGraphCompileFromFile(fileName, nil, options) if graph.size == 0 { fatalError() } ``` ## See Also --- 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)