---
title: "allocateTensor(forFunction:argument:fillKnownDynamicShapes:)"
framework: accelerate
role: symbol
role_heading: Instance Method
path: "accelerate/bnnsgraph/context/allocatetensor(forfunction:argument:fillknowndynamicshapes:)"
---

# allocateTensor(forFunction:argument:fillKnownDynamicShapes:)

Returns an allocated tensor for a given function argument.

## Declaration

```swift
func allocateTensor(forFunction function: String? = nil, argument: String, fillKnownDynamicShapes: Bool) -> BNNSTensor?
```

## Parameters

- `function`: The specific function to create the tensor for. You may set this to nil if there is only one function.
- `argument`: The argument to create the tensor for.
- `fillKnownDynamicShapes`: If true, the function replaces any dynamic shapes with shapes that will be used on next execution of Context, either drawn from default shapes in the .mlmodelc function or supplied by a preceding call to setDynamicShapes(_:forFunction:) or setBatchSize(_:forFunction:). Otherwise the function represents dynamically-sized dimensions with a value of -1 in either shape or stride as appropriate.

## Discussion

Discussion note: This function supports Float, Float16, Bool, and Int32 datatypes only and returns nil for other types. note: BNNSGraphContextGetTensor