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paddle.fluid / dataset / InMemoryDataset
InMemoryDataset¶
InMemoryDataset会向内存中加载数据并在训练前缓冲数据。此类由DatasetFactory创建。
代码示例:
dataset = paddle.fluid.DatasetFactory().create_dataset(“InMemoryDataset”)
-
set_queue_num
( queue_num ) ¶
设置 Dataset
输出队列数量,训练进程会从队列中获取数据。
- 参数:
-
queue_num (int) - dataset输出队列数量
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
dataset.set_queue_num(12)
-
set_fleet_send_batch_size
( fleet_send_batch_size ) ¶
设置发送batch的大小
- 参数:
-
fleet_send_batch_size (int) - 设置发送batch的大小。
代码示例
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
dataset.set_fleet_send_batch_size(800)
-
set_merge_by_lineid
( var_list, erase_duplicate_feas=True, min_merge_size=2, keep_unmerged-ins=True ) ¶
通过样本id来设置合并,一些线id的实例将会在shuffle之后进行合并,你应该在一个data生成器里面解析样本id。
- 参数:
-
var_list (list) - 可以被合并的特征列表,其中的每一个元素都是一个
Variable
。一些类特征我们通常不把它们合并为同样的样本id,所以用户应当指定哪个类特征可以被合并。erase_duplicate_feas (bool) - 合并的时候是否删除重复的特征值。默认为True。
min_merge_size (int) - 合并的最小数量。默认为2。
keep_unmerged_ins (bool) - 是否保留没有合并的样本,比如有着独特id的样本,或者重复id的数量小于
min_merge_size
的样本。
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
dataset.set_merge_by_lineid()
-
load_into_memory
( ) ¶
向内存中加载数据。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.load_into_memory()
-
preload_into_memory
( ) ¶
向内存中以异步模式加载数据。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.preload_into_memory()
dataset.wait_preload_done()
-
wait_preload_done
( ) ¶
等待 preload_into_memory
完成。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset("InMemoryDataset")
filelist = ["a.txt", "b.txt"]
dataset.set_filelist(filelist)
dataset.preload_into_memory()
dataset.wait_preload_done()
-
local_shuffle
( ) ¶
局域shuffle。
代码示例:
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 ) ¶
全局shuffle。
只能用在分布式模式(单机多进程或多机多进程)中。您如果在分布式模式中运行,应当传递fleet而非None。
代码示例:
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)
- 参数:
-
fleet (Fleet) – fleet单例。默认为None。
-
release_memory
( ) ¶
当数据不再使用时,释放InMemoryDataset内存数据。
代码示例:
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 ) ¶
用户可以调用此函数以了解加载进内存后所有workers中的样本数量。
注解
该函数可能会导致性能不佳,因为它具有barrier。
- 参数:
-
fleet (Fleet) – fleet对象。
返回:内存数据的大小。
代码示例:
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 ) ¶
获取shuffle数据大小,用户可以调用此函数以了解局域/全局shuffle后所有workers中的样本数量。
注解
该函数可能会导致局域shuffle性能不佳,因为它具有barrier。但其不影响局域shuffle。
- 参数:
-
fleet (Fleet) – fleet对象。
返回:shuffle数据的大小。
代码示例:
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)
-
set_batch_size
( batch_size ) ¶
设置batch size。在训练期间生效。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_batch_size(128)
- 参数:
-
batch_size (int) - batch size
-
set_fea_eval
( record_candidate_size, fea_eval=True ) ¶
设置特征打乱特征验证模式,来修正特征level的重要性, 特征打乱需要 fea_eval
被设置为True。
- 参数:
-
record_candidate_size (int) - 打乱一个特征的候选实例大小
fea_eval (bool) - 是否设置特征验证模式来打乱特征,默认为True。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset(“InMemoryDataset”)
dataset.set_fea_eval(1000000, True)
-
desc
( ) ¶
为 DataFeedDesc
返回一个缓存信息。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
print(dataset.desc())
返回:一个字符串信息
-
set_filelist
( filelist ) ¶
在当前的worker中设置文件列表。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_filelist(["a.txt", "b.txt"])
- 参数:
-
filelist (list) - 文件列表
-
set_hdfs_config
( fs_name, fs_ugi ) ¶
设置hdfs配置:fs名称与ugi。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_hdfs_config("my_fs_name", "my_fs_ugi")
- 参数:
-
fs_name (str) - fs名称
fs_ugi (str) - fs ugi
-
set_pipe_command
( pipe_coommand ) ¶
在当前的 dataset
中设置pipe命令。pipe命令只能使用UNIX的pipe命令
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_pipe_command("python my_script.py")
- 参数:
-
pipe_command (str) - pipe命令
-
set_thread
( thread_num ) ¶
设置进程数量,等于readers的数量。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_thread(12)
- 参数:
-
thread_num (int) - 进程数量
-
set_use_var
( var_list ) ¶
设置将要使用的 Variable
。
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset()
dataset.set_use_var([data, label])
- 参数:
-
var_list (list) - variable 列表
-
slots_shuffle
( slots ) ¶
该方法是在特征层次上的一个打乱方法,经常被用在有着较大缩放率实例的稀疏矩阵上,为了比较metric,比如auc,在一个或者多个有着baseline的特征上做特征打乱来验证特征level的重要性。
- 参数:
-
slots (list[string]) - 要打乱特征的集合
代码示例:
import paddle.fluid as fluid
dataset = fluid.DatasetFactory().create_dataset(“InMemoryDataset”)
dataset.set_merge_by_lineid()
#支持slot 0
dataset.slots_shuffle([‘0’])
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