fluid.dataset¶

DatasetFactory is a factory which create dataset by its name, you can create “QueueDataset” or “InMemoryDataset”, or “FileInstantDataset”, the default is “QueueDataset”.

Example

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")

create_dataset(datafeed_class='QueueDataset')

Create “QueueDataset” or “InMemoryDataset”, or “FileInstantDataset”, the default is “QueueDataset”.

Parameters

datafeed_class (str) – datafeed class name, QueueDataset or InMemoryDataset. Default is QueueDataset.

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()

InMemoryDataset, it will load data into memory and shuffle data before training. This class should be created by DatasetFactory

Example

dataset = paddle.fluid.DatasetFactory().create_dataset(“InMemoryDataset”)

load_into_memory()

Load data into memory

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.load_into_memory()

local_shuffle()

Local shuffle

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.load_into_memory()
dataset.local_shuffle()

global_shuffle(fleet=None)

Global shuffle. Global shuffle can be used only in distributed mode. i.e. multiple processes on single machine or multiple machines training together. If you run in distributed mode, you should pass fleet instead of None.

Examples

import paddle.fluid as fluid
from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.load_into_memory()
dataset.global_shuffle(fleet)

Parameters

fleet (Fleet) – fleet singleton. Default None.

release_memory()

Release InMemoryDataset memory data, when data will not be used again.

Examples

import paddle.fluid as fluid
from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.load_into_memory()
dataset.global_shuffle(fleet)
exe = fluid.Executor(fluid.CPUPlace())
exe.run(fluid.default_startup_program())
exe.train_from_dataset(fluid.default_main_program(), dataset)
dataset.release_memory()

get_memory_data_size(fleet=None)

Get memory data size, user can call this function to know the num of ins in all workers after load into memory.

Note

This function may cause bad performance, because it has barrier

Parameters

fleet (Fleet) – Fleet Object.

Returns

The size of memory data.

Examples

import paddle.fluid as fluid
from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.load_into_memory()
print dataset.get_memory_data_size(fleet)

get_shuffle_data_size(fleet=None)

Get shuffle data size, user can call this function to know the num of ins in all workers after local/global shuffle.

Note

This function may cause bad performance to local shuffle, because it has barrier. It does not affect global shuffle.

Parameters

fleet (Fleet) – Fleet Object.

Returns

The size of shuffle data.

Examples

import paddle.fluid as fluid
from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.load_into_memory()
dataset.global_shuffle(fleet)
print dataset.get_shuffle_data_size(fleet)

desc()

Returns a protobuf message for this DataFeedDesc

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
print(dataset.desc())

Returns

A string message

set_batch_size(batch_size)

Set batch size. Will be effective during training

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_batch_size(128)

Parameters

batch_size (int) – batch size

set_filelist(filelist)

Set file list in current worker.

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_filelist(['a.txt', 'b.txt'])

Parameters

filelist (list) – file list

set_hdfs_config(fs_name, fs_ugi)

Set hdfs config: fs name ad ugi

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_hdfs_config("my_fs_name", "my_fs_ugi")

Parameters

• fs_name (str) – fs name

• fs_ugi (str) – fs ugi

set_pipe_command(pipe_command)

Set pipe command of current dataset A pipe command is a UNIX pipeline command that can be used only

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_pipe_command("python my_script.py")

Parameters

pipe_command (str) – pipe command

set_thread(thread_num)

Set thread num, it is the num of readers.

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
 dataset.set_thread(12)

Parameters

thread_num (int) – thread num

set_use_var(var_list)

Set Variables which you will use.

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_use_var([data, label])

Parameters

var_list (list) – variable list

QueueDataset, it will process data streamly.

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("QueueDataset")

local_shuffle()

Local shuffle data.

Local shuffle is not supported in QueueDataset NotImplementedError will be raised

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("QueueDataset")
dataset.local_shuffle()

global_shuffle(fleet=None)

Global shuffle data.

Global shuffle is not supported in QueueDataset NotImplementedError will be raised

Examples

import paddle.fluid as fluid
from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
dataset = fluid.DatasetFactory().create_dataset("QueueDataset")
dataset.global_shuffle(fleet)

desc()

Returns a protobuf message for this DataFeedDesc

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
print(dataset.desc())

Returns

A string message

set_batch_size(batch_size)

Set batch size. Will be effective during training

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_batch_size(128)

Parameters

batch_size (int) – batch size

set_filelist(filelist)

Set file list in current worker.

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_filelist(['a.txt', 'b.txt'])

Parameters

filelist (list) – file list

set_hdfs_config(fs_name, fs_ugi)

Set hdfs config: fs name ad ugi

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_hdfs_config("my_fs_name", "my_fs_ugi")

Parameters

• fs_name (str) – fs name

• fs_ugi (str) – fs ugi

set_pipe_command(pipe_command)

Set pipe command of current dataset A pipe command is a UNIX pipeline command that can be used only

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_pipe_command("python my_script.py")

Parameters

pipe_command (str) – pipe command

set_thread(thread_num)

Set thread num, it is the num of readers.

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
 dataset.set_thread(12)

Parameters

thread_num (int) – thread num

set_use_var(var_list)

Set Variables which you will use.

Examples

import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_use_var([data, label])

Parameters

var_list (list) – variable list