caffe2::Blob Class Reference

Blob is a general container that hosts a typed pointer. More...

#include <blob.h>

Public Member Functions
	Blob ()
	Initializes an empty Blob.
	Blob (Blob &&other) noexcept
Blob &	operator= (Blob &&other) noexcept
template<class T >
bool	IsType () const
	Checks if the content stored in the blob is of type T.
const TypeMeta &	meta () const
	Returns the meta info of the blob.
const char *	TypeName () const
	Returns a printable typename of the blob.
template<class T >
const T &	Get () const
	Gets the const reference of the stored object. More...
const void *	GetRaw () const
void *	GetRaw ()
template<class T >
T *	GetMutable (bool *is_new_object=nullptr)
	Gets a mutable pointer to the stored object. More...
template<class T >
T *	Reset (T *allocated)
	Sets the underlying object to the allocated one. More...
template<class T >
std::remove_const< T >::type *	ShareExternal (typename std::remove_const< T >::type *allocated)
	Sets the underlying object to the allocated one, but does not take over the ownership of the passed in pointer. More...
void *	ShareExternal (void *allocated, const TypeMeta &meta)
void	Reset ()
	Resets the Blob to an empty one.
void	Serialize (const string &name, BlobSerializerBase::SerializationAcceptor acceptor, int chunk_size=kDefaultChunkSize) const
	Serializes the current blob, if possible. More...
string	Serialize (const string &name) const
	Convenience function to serialize a blob to a string. More...
void	swap (Blob &rhs)
	Swaps the underlying storage of two blobs.
void	Deserialize (const string &content)
	Deserializes from a string containing either BlobProto or TensorProto. More...
void	Deserialize (const BlobProto &proto)

Detailed Description

Blob is a general container that hosts a typed pointer.

A Blob hosts a pointer as well as its type, and takes charge of deleting it properly when the blob is deallocated or re-allocated with a new type. A blob could contain anything, although the most common case is to contain a Tensor.

Definition at line 25 of file blob.h.

Member Function Documentation

Deserialize()

void caffe2::Blob::Deserialize

(

const string &

content

)

Deserializes from a string containing either BlobProto or TensorProto.

If the deserialization fails, the content in the blob should no longer be trusted.

Definition at line 89 of file blob_serialization.cc.

Get()

template<class T >

const T& caffe2::Blob::Get ( ) const

inline

Gets the const reference of the stored object.

The code checks if the stored object is of the desired type.

Definition at line 73 of file blob.h.

GetMutable()

template<class T >

T* caffe2::Blob::GetMutable ( bool *  is_new_object = nullptr )

inline

Gets a mutable pointer to the stored object.

If the current object is not of the right type, a new object is created and the old object is freed. Note that type T should have a default constructor. Otherwise, create the object yourself first, and and use Reset().

Definition at line 96 of file blob.h.

Reset()

template<class T >

T* caffe2::Blob::Reset ( T *  allocated )

inline

Sets the underlying object to the allocated one.

The Blob then takes over the ownership of the passed in pointer. If there is already an object in the Blob, the old object is freed.

This is used when the underlying class T does not have a default ctor, or complex initializations needs to be done outside the blob.

Definition at line 116 of file blob.h.

Serialize() [1/2]

void caffe2::Blob::Serialize	(	const string &	name,
		BlobSerializerBase::SerializationAcceptor	acceptor,
		int	chunk_size = kDefaultChunkSize
	)		const

Serializes the current blob, if possible.

Note that this serialization uses the registration mechanism and one has to implement specific serialization approaches for specific classes. Acceptor should take care of writing data to the actual storage.

Definition at line 55 of file blob_serialization.cc.

Serialize() [2/2]

std::string caffe2::Blob::Serialize

(

const string &

name

)

const

Convenience function to serialize a blob to a string.

This is a conveinence function to serialize small Blobs that produce manageable serialized strings. To serialize big blobs such as large sparse tensors, use the fully-functional interface in blob_serializer_base.h.

NOTE: this function doesn't do chunking and might break with big tensors.

Definition at line 65 of file blob_serialization.cc.

ShareExternal()

template<class T >

std::remove_const<T>::type* caffe2::Blob::ShareExternal ( typename std::remove_const< T >::type *  allocated )

inline

Sets the underlying object to the allocated one, but does not take over the ownership of the passed in pointer.

If there is already an object in the Blob, the old object is freed.

Unlike Reset, this does not take over the ownership of the pointer and the caller is responsible for making sure that the lifetime of the allocated blob outlasts the lifetime of any access to this blob, until another Reset call is made or the blob is destructed.

Definition at line 137 of file blob.h.

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The documentation for this class was generated from the following files:

• caffe2/core/blob.h
• caffe2/core/blob_serialization.cc