---
title: "makeContext(options:_:)"
framework: accelerate
role: symbol
role_heading: Type Method
path: "accelerate/bnnsgraph/makecontext(options:_:)"
---

# makeContext(options:_:)

Returns a new context that wraps a graph object that the given closure defines.

## Declaration

```swift
static func makeContext(options: BNNSGraph.CompileOptions = CompileOptions(), _ block: (inout BNNSGraph.Builder) -> [any BNNSGraph.TensorDescriptor]) throws -> BNNSGraph.Context
```

## Parameters

- `options`: The compilation options.
- `block`: A closure with a BNNSGraph.Builder parameter that points to the BNNS Graph builder.

## Discussion

Discussion Use this function to specify the operations that define a BNNS graph. For example, the following code creates a graph that performs element-wise multiplication of two eight-element vectors:    let context = try BNNSGraph.makeContext ({        builder in

let x = builder.argument(name: "x",                                 dataType: Float.self,                                 shape: [8])        let y = builder.argument(name: "y",                                 dataType: Float.self,                                 shape: [8])

let z = x * y

return [z]    }) The following code defines the arguments and executes the graph:    var args = context.argumentNames().map {        name in

return context.tensor(argument: name,                              fillKnownDynamicShapes: false)!    }

defer {        args.forEach {            $0.deallocate()        }    }

args[context.argumentPosition(argument: "x")]        .allocate(initializingFrom: [1, 2, 3, 4, 5, 6, 7, 8] as [Float])

args[context.argumentPosition(argument: "y")]        .allocate(initializingFrom: [8, 7, 6, 5, 4, 3, 2, 1] as [Float])

// Output argument    args[0].allocate(as: Float.self, count: 8)

try context.executeFunction(arguments: &args) On return, args[0] contains the values [8.0, 14.0, 18.0, 20.0, 20.0, 18.0, 14.0, 8.0].

## See Also

### Building graphs in Swift

- [BNNSGraph.Builder](accelerate/bnnsgraph/builder.md)
- [BNNSGraph.Builder.Tensor](accelerate/bnnsgraph/builder/tensor.md)
- [Supporting real-time ML inference on the CPU](accelerate/supporting-real-time-ml-inference-on-the-cpu.md)