Save the date! Google I/O returns May 18-20 Register now

tf.LMDBReader

View source on GitHub

A Reader that outputs the records from a LMDB file.

Inherits From: ReaderBase

See ReaderBase for supported methods.

name A name for the operation (optional).
options A LMDBRecordOptions object (optional).

Eager Compatibility

Readers are not compatible with eager execution. Instead, please use tf.data to get data into your model.

reader_ref Op that implements the reader.
supports_serialize Whether the Reader implementation can serialize its state.

Methods

num_records_produced

View source

Returns the number of records this reader has produced.

This is the same as the number of Read executions that have succeeded.

Args
name A name for the operation (optional).

Returns
An int64 Tensor.

num_work_units_completed

View source

Returns the number of work units this reader has finished processing.

Args
name A name for the operation (optional).

Returns
An int64 Tensor.

read

View source

Returns the next record (key, value) pair produced by a reader.

Will dequeue a work unit from queue if necessary (e.g. when the Reader needs to start reading from a new file since it has finished with the previous file).

Args
queue A Queue or a mutable string Tensor representing a handle to a Queue, with string work items.
name A name for the operation (optional).

Returns
A tuple of Tensors (key, value).
key A string scalar Tensor.
value A string scalar Tensor.

read_up_to

View source

Returns up to num_records (key, value) pairs produced by a reader.

Will dequeue a work unit from queue if necessary (e.g., when the Reader needs to start reading from a new file since it has finished with the previous file). It may return less than num_records even before the last batch.

Args
queue A Queue or a mutable string Tensor representing a handle to a Queue, with string work items.
num_records Number of records to read.
name A name for the operation (optional).

Returns
A tuple of Tensors (keys, values).
keys A 1-D string Tensor.
values A 1-D string Tensor.

reset

View source

Restore a reader to its initial clean state.

Args
name A name for the operation (optional).

Returns
The created Operation.

restore_state

View source

Restore a reader to a previously saved state.

Not all Readers support being restored, so this can produce an Unimplemented error.

Args
state A string Tensor. Result of a SerializeState of a Reader with matching type.
name A name for the operation (optional).

Returns
The created Operation.

serialize_state

View source

Produce a string tensor that encodes the state of a reader.

Not all Readers support being serialized, so this can produce an Unimplemented error.

Args
name A name for the operation (optional).

Returns
A string Tensor.