Class Iterator

Defined in File iterator.h

Nested Relationships

Nested Types

Class Iterator::_Iterator

Inheritance Relationships

Derived Type

public mindspore::dataset::PullIterator (Class PullIterator)

Class Documentation

class Iterator

Subclassed by mindspore::dataset::PullIterator

Public Functions

Iterator(): Constructor.

virtual ~Iterator(): Destructor.

Status BuildAndLaunchTree(const std::shared_ptr<Dataset> &ds, int32_t num_epochs)

Method for building and launching the pipeline.

Parameters

ds – [in] The last DatasetOp in the dataset pipeline.
num_epochs – [in] Number of epochs passed down to EpochCtrlNode (default=-1, which means infinite epochs).

Returns

Status error code, returns OK if no error encountered.

inline Status GetNextRow(MSTensorMap *row)

Function to get the next row from the data pipeline.

Note

Type of return data is a unordered_map(with column name).

Parameters

row – [out] The output tensor row.

Returns

Status error code, returns OK if no error encountered.

样例

/* dataset is an instance of Dataset object */
std::shared_ptr<Iterator> = dataset->CreateIterator();
std::unordered_map<std::string, mindspore::MSTensor> row;
iter->GetNextRow(&row);

Status GetNextRowCharIF(MSTensorMapChar *row): Char interface(CharIF) of GetNextRow.

Note

The reason for using this API is that std::string will be constrained by the compiler option ‘_GLIBCXX_USE_CXX11_ABI’ while char is free of this restriction.

virtual Status GetNextRow(MSTensorVec *row)

Function to get the next row from the data pipeline.

Note

Type of return data is a vector(without column name).

Parameters

row – [out] The output tensor row.

Returns

Status error code, returns OK if no error encountered.

样例

/* dataset is an instance of Dataset object */
std::shared_ptr<Iterator> = dataset->CreateIterator();
std::vector<mindspore::MSTensor> row;
iter->GetNextRow(&row);

void Stop(): Function to shut down the data pipeline.

inline _Iterator begin(): Function to return the iterator points to the begin of Iterator.

inline _Iterator end(): Function to return the iterator points to the end of Iterator.

class _Iterator

Inter class as iterator of Iterator.

Public Functions

explicit _Iterator(Iterator *lt): Constructor.

inline ~_Iterator(): Destructor.