Class TextureTensorData

Represents the data storage for a 'Tensor' as a render texture, for backends that use GPU pixel shaders.

Sentis packs the tensor data into the pixels of an RGBA float4 texture.

Sentis chooses a single tensor dimension as the blocked axis, across which data is chunked in float4 blocks.

Tensor dimensions don't map directly to texture dimensions. Sentis creates the texture with dimensions large enough to fit all the data and pixel shaders index the data based on both the tensor and texture dimensions (see example below).

Inheritance

object

TextureTensorData

Implements

ITensorData

IDisposable

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

Namespace: Unity.Sentis

Assembly: Unity.Sentis.dll

Syntax

public class TextureTensorData : ITensorData, IDisposable

Constructors

TextureTensorData(DataType, TensorShape, int, bool)

Initializes and returns an instance of TextureTensorData with given shape and blocked axis. A RenderTexture is allocated to the correct size.

Declaration

public TextureTensorData(DataType dataType, TensorShape shape, int axis, bool clearOnInit = false)

Parameters

Type	Name	Description
DataType	dataType	The data type of the tensor.
TensorShape	shape	The (unblocked) shape of the tensor.
int	axis	The axis on which to block the shape.
bool	clearOnInit	Whether to zero the data on allocation. The default value is false.

Properties

backendType

On what backend are the data elements stored.

Declaration

public BackendType backendType { get; }

Property Value

Type	Description
BackendType

blockAxis

Returns the axis of the tensor which is blocked.

It is possible to block on negative axes by considering a tensor of shape (d0, d1 ... dn) as one of shape (1, 1, .... 1, d0, d1 ... dn).

Thus negative axis values do not count from the back of the shape as elsewhere.

Declaration

public int blockAxis { get; }

Property Value

Type	Description
int

blockedAxisDiv4RemainderMask

A 4 int mask with 1 or 0 in each component to indicate whether the last blocked slice along the blocked axis has a valid entry or not. eg. if dimAxis % 4 = ceil(dimAxis/4)*4 - dimAxis = 3, blockedAxisDiv4RemainderMask = {1, 1, 1, 0};

Declaration

public int[] blockedAxisDiv4RemainderMask { get; }

Property Value

Type	Description
int[]

blockedShape

Returns the shape of the tensor with the blocked axis divided by 4.

Declaration

public TensorShape blockedShape { get; }

Property Value

Type	Description
TensorShape

bufferAsTexture

Returns the backing texture storing the tensor data.

Declaration

public RenderTexture bufferAsTexture { get; }

Property Value

Type	Description
RenderTexture

dataType

Returns the data type of the associated tensor.

Declaration

public DataType dataType { get; }

Property Value

Type	Description
DataType

dimAxis

The size of the blocked axis in the original tensor shape (when not blocked).

Declaration

public int dimAxis { get; }

Property Value

Type	Description
int

dimAxisDiv4

The size of the blocked axis in the blocked tensor shape, i.e. dimAxisDiv4 = ceil(dimAxis / 4).

Declaration

public int dimAxisDiv4 { get; }

Property Value

Type	Description
int

maxCapacity

The maximum count of the stored data elements.

Declaration

public int maxCapacity { get; }

Property Value

Type	Description
int

shape

Returns the shape of the associated tensor.

Declaration

public TensorShape shape { get; }

Property Value

Type	Description
TensorShape

strideAxis

The size of the stride of the blocked axis.

Declaration

public int strideAxis { get; }

Property Value

Type	Description
int

widthMask

Returns the width of the texture - 1 for efficient masking in shaders.

Declaration

public int widthMask { get; }

Property Value

Type	Description
int

widthShift

Returns the power in the power of two width of the backing texture.

Declaration

public int widthShift { get; }

Property Value

Type	Description
int

Methods

Clone()

Returns a deep copy of the internal storage.

Declaration

public ITensorData Clone()

Returns

Type	Description
ITensorData	Cloned internal storage.

CompleteAllPendingOperations()

Blocking call to make sure that internal data is correctly written to and available for CPU read back.

Declaration

public void CompleteAllPendingOperations()

Dispose()

Disposes of the TextureTensorData and any associated memory.

Declaration

public void Dispose()

DownloadAsync<T>(int)

Awaitable contiguous block of data from internal storage.

Declaration

public Awaitable<NativeArray<T>> DownloadAsync<T>(int dstCount) where T : unmanaged

Parameters

Type	Name	Description
int	dstCount	The number of elements to download.

Returns

Type	Description
Awaitable<NativeArray<T>>	A awaitable native array of downloaded elements.

Type Parameters

Name	Description
T	The data type of the elements.

Download<T>(int)

Returns a contiguous block of data from internal storage.

Declaration

public NativeArray<T> Download<T>(int dstCount) where T : unmanaged

Parameters

Type	Name	Description
int	dstCount	The number of elements to download.

Returns

Type	Description
NativeArray<T>	A native array of downloaded elements.

Type Parameters

Name	Description
T	The data type of the elements.

~TextureTensorData()

Finalizes the TextureTensorData.

Declaration

protected ~TextureTensorData()

IsReadbackRequestDone()

Checks if asynchronous readback request is done.

Declaration

public bool IsReadbackRequestDone()

Returns

Type	Description
bool	Whether async readback is successful.

Pin(Tensor, int, bool)

Moves the tensor into GPU memory on the GPUPixel back end device.

Declaration

public static TextureTensorData Pin(Tensor X, int blockAxis, bool clearOnInit = false)

Parameters

Type	Name	Description
Tensor	X	The tensor to move to the compute backend.
int	blockAxis	Which axis to block the tensor shape on.
bool	clearOnInit	Whether to zero the data on pinning. The default value is false.

Returns

Type	Description
TextureTensorData	The pinned TextureTensorData.

ReadbackRequest()

Schedules asynchronous readback of the internal data.

Declaration

public void ReadbackRequest()

ReadbackRequestAsync()

Declaration

public Task<bool> ReadbackRequestAsync()

Returns

Type	Description
Task<bool>

ToString()

Returns a string that represents the TextureTensorData.

Declaration

public override string ToString()

Returns

Type	Description
string	The summary string of the TextureTensorData.

Overrides

object.ToString()

Upload<T>(NativeArray<T>, int)

Uploads a contiguous block of tensor data to internal storage.

Declaration

public void Upload<T>(NativeArray<T> data, int srcCount) where T : unmanaged

Parameters

Type	Name	Description
NativeArray<T>	data	The data to upload.
int	srcCount	The number of elements to upload.

Type Parameters

Name	Description
T	The type of data to upload.

Implements

ITensorData

IDisposable