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# maxPooling2DGradient(withGradientTensor:sourceTensor:descriptor:name:)

Creates a max-pooling gradient operation and returns the result tensor.

```
func maxPooling2DGradient(withGradientTensor gradient: MPSGraphTensor, sourceTensor source: MPSGraphTensor, descriptor: MPSGraphPooling2DOpDescriptor, name: String?) -> MPSGraphTensor
```

## Parameters

`gradient`

A 2D input gradient tensor - must be of rank=4. The layout is defined by `descriptor.dataLayout`.

`source`

The input tensor for the forward pass.

`descriptor`

A pooling operation descriptor that specifies pooling window sizes, strides, dilation rates, paddings and layouts.

`name`

The name for the operation.

## Return Value

A valid MPSGraphTensor object

---

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