Class MSTensor

Defined in File types.h

Class Documentation

class MSTensor

The MSTensor class defines a tensor in MindSpore.

Public Functions

inline std::string Name() const

Obtains the name of the MSTensor.

Returns: The name of the MSTensor.

enum DataType DataType() const

Obtains the data type of the MSTensor.

Returns: The data type of the MSTensor.

const std::vector<int64_t> &Shape() const

Obtains the shape of the MSTensor.

Returns: The shape of the MSTensor.

int64_t ElementNum() const

Obtains the number of elements of the MSTensor.

Returns: The number of elements of the MSTensor.

std::shared_ptr<const void> Data() const

Obtains a shared pointer to the copy of data of the MSTensor. The data can be read on host.

Returns: A shared pointer to the copy of data of the MSTensor.

void *MutableData()

Obtains the pointer to the data of the MSTensor. If the MSTensor is a device tensor, the data cannot be accessed directly on host.

Returns: A pointer to the data of the MSTensor.

size_t DataSize() const

Obtains the length of the data of the MSTensor, in bytes.

Returns: The length of the data of the MSTensor, in bytes.

bool IsConst() const

Get whether the MSTensor data is const data.

Returns: Const flag of MSTensor

bool IsDevice() const

Gets the boolean value that indicates whether the memory of MSTensor is on device.

Returns: The boolean value that indicates whether the memory of MSTensor is on device.

MSTensor *Clone() const

Gets a deep copy of the MSTensor, must be used in pair with DestroyTensorPtr.

Returns: A pointer points to a deep copy of the MSTensor.

void SetShape(const std::vector<int64_t> &shape)

Set the shape of for the MSTensor. Only valid for Lite.

Parameters: shape – [in] Shape of the MSTensor, a vector of int64_t.

void SetDataType(enum DataType data_type)

Set the data type for the MSTensor. Only valid for Lite.

Parameters: data_type – [in] The data type of the MSTensor.

inline void SetTensorName(const std::string &name)

Set the name for the MSTensor. Only valid for Lite.

Parameters: name – [in] The name of the MSTensor.

void SetAllocator(std::shared_ptr<Allocator> allocator)

Set the Allocator for the MSTensor. Only valid for Lite.

Parameters: allocator – [in] A pointer to Allocator.

std::shared_ptr<Allocator> allocator() const

Obtain the Allocator of the MSTensor. Only valid for Lite.

Returns: A pointer to Allocator.

void SetFormat(mindspore::Format format)

Set the format for the MSTensor. Only valid for Lite.

Parameters: format – [in] The format of the MSTensor.

mindspore::Format format() const

Obtain the format of the MSTensor. Only valid for Lite.

Returns: The format of the MSTensor.

void SetData(void *data)

Set the data for the MSTensor. Only valid for Lite.

Note

Deprecated, this interface will be removed in the next iteration

Note

A pointer to the data should be created by malloc interface

Note

The memory pointed to origin data pointer of MSTensor needs to be managed by the user

Parameters: data – [in] A pointer to the data of the MSTensor.

std::vector<QuantParam> QuantParams() const

Get the quantization parameters of the MSTensor. Only valid for Lite.

Returns: The quantization parameters of the MSTensor.

void SetQuantParams(std::vector<QuantParam> quant_params)

Set the quantization parameters for the MSTensor. Only valid for Lite.

Parameters: quant_params – [in] The quantization parameters of the MSTensor.

Public Static Functions

static inline MSTensor *CreateTensor(const std::string &name, DataType type, const std::vector<int64_t> &shape, const void *data, size_t data_len) noexcept

Creates a MSTensor object, whose data need to be copied before accessed by Model, must be used in pairs with DestroyTensorPtr.

Parameters

name – [in] The name of the MSTensor.
type – [in] The data type of the MSTensor.
shape – [in] The shape of the MSTensor.
data – [in] The data pointer that points to allocated memory.
data_len – [in] The length of the memory, in bytes.

Returns

A pointer of MSTensor.

static inline MSTensor *CreateRefTensor(const std::string &name, DataType type, const std::vector<int64_t> &shape, const void *data, size_t data_len) noexcept

Creates a MSTensor object, whose data can be directly accessed by Model, must be used in pairs with DestroyTensorPtr.

Parameters

name – [in] The name of the MSTensor.
type – [in] The data type of the MSTensor.
shape – [in] The shape of the MSTensor.
data – [in] The data pointer that points to allocated memory.
data_len – [in] The length of the memory, in bytes.

Returns

A pointer of MSTensor.

static inline MSTensor *CreateDevTensor(const std::string &name, DataType type, const std::vector<int64_t> &shape, const void *data, size_t data_len) noexcept

Creates a MSTensor object, whose device data can be directly accessed by Model, must be used in pairs with DestroyTensorPtr.

Parameters

name – [in] The name of the MSTensor.
type – [in] The data type of the MSTensor.
shape – [in] The shape of the MSTensor.
data – [in] The data pointer that points to device memory.
data_len – [in] The length of the memory, in bytes.

Returns

A pointer of MSTensor.

static inline MSTensor *CreateTensorFromFile(const std::string &file, DataType type = DataType::kNumberTypeUInt8, const std::vector<int64_t> &shape = {}) noexcept

Creates a MSTensor object from local file, must be used in pairs with DestroyTensorPtr.

Parameters

file – [in] Path of file to be read.
type – [in] The data type of the MSTensor.
shape – [in] The shape of the MSTensor.

Returns

A pointer of MSTensor.

static inline MSTensor *StringsToTensor(const std::string &name, const std::vector<std::string> &str)

Create a string type MSTensor object whose data can be accessed by Model only after being copied, must be used in pair with DestroyTensorPtr.

Parameters

name – [in] The name of the MSTensor.
str – [in] A vector container containing several strings.

Returns

A pointer of MSTensor.

static inline std::vector<std::string> TensorToStrings(const MSTensor &tensor)

Parse the string type MSTensor object into strings.

Parameters: tensor – [in] A MSTensor object.
Returns: A vector container containing several strings.

static void DestroyTensorPtr(MSTensor *tensor) noexcept

Destroy an object created by Clone, StringsToTensor, CreateRefTensor, CreateDevTensor or CreateTensor. Do not use it to destroy MSTensor from other sources.

Parameters: tensor – [in] A MSTensor object.