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# BNNSTileBackward(_:_:_:)

Applies a tile filter backward to generate an input gradient.

```
func BNNSTileBackward(_ in_delta: UnsafeMutablePointer<BNNSNDArrayDescriptor>, _ out_delta: UnsafePointer<BNNSNDArrayDescriptor>, _ filter_params: UnsafePointer<BNNSFilterParameters>?) -> Int32
```

## Parameters

`in_delta`

A pointer to the input delta descriptor.

`out_delta`

A pointer to the output delta descriptor.

`filter_params`

The filter runtime parameters.

## Discussion

---

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