Torch:如何按行对张量进行洗牌?

问题描述

我目前正在使用 Torch 对一些输入数据实现随机洗牌(在本例中为第一维).我是 Torch 的新手，所以我在弄清楚排列如何工作时遇到了一些麻烦..

以下应该对数据进行洗牌:

if argshuffle then本地烫发 = torch.randperm(sids:size(1)):long()print("\n\n\n之前的 X 和 y 的大小")打印(X:视图(-1、1000、128):大小())打印(y:大小())打印(sids:大小())打印(\n烫发大小是:")打印(烫发:大小())X = X:view(-1, 1000, 128)[{{perm},{},{}}]y = y[{{perm},{}}]打印(sids[{{1}, {}}])sids = sids[{{perm},{}}]打印(sids[{{1}, {}}])打印(X:大小())打印(y:大小())打印(sids:大小())操作系统退出(69)结尾

打印出来

之前X和y的大小991000128[尺寸 3 的torch.LongStorage]991[大小 2 的torch.LongStorage]991[大小 2 的torch.LongStorage]烫发尺寸为:99[大小 1 的torch.LongStorage]5[大小为 1x1 的torch.LongStorage]5[大小为 1x1 的torch.LongStorage]991000128[尺寸 3 的torch.LongStorage]991[大小 2 的torch.LongStorage]991[大小 2 的torch.LongStorage]

在值之外，我可以暗示该函数没有对数据进行混洗.我怎样才能让它正确洗牌，lua/torch 中的常见解决方案是什么?

解决方案

我也遇到了类似的问题.在文档中，张量没有 shuffle 函数(有用于 数据集加载器).我使用 torch.randperm 找到了解决该问题的方法.

>>>a=torch.rand(3,5)>>>打印(一)张量([[0.4896, 0.3708, 0.2183, 0.8157, 0.7861],[0.0845, 0.7596, 0.5231, 0.4861, 0.9237],[0.4496, 0.5980, 0.7473, 0.2005, 0.8990]])>>># 行洗牌...>>>a=a[torch.randperm(a.size()[0])]>>>打印(一)张量([[0.4496, 0.5980, 0.7473, 0.2005, 0.8990],[0.0845, 0.7596, 0.5231, 0.4861, 0.9237],[0.4896, 0.3708, 0.2183, 0.8157, 0.7861]])>>># 列洗牌...>>>a=a[:,torch.randperm(a.size()[1])]>>>打印(一)张量([[0.2005, 0.7473, 0.5980, 0.8990, 0.4496],[0.4861, 0.5231, 0.7596, 0.9237, 0.0845],[0.8157, 0.2183, 0.3708, 0.7861, 0.4896]])

我希望它回答了这个问题！

I am currently working in torch to implement a random shuffle (on the rows, the first dimension in this case) on some input data. I am new to torch, so I have some troubles figuring out how permutation works..

The following is supposed to shuffle the data:

if argshuffle then
    local perm = torch.randperm(sids:size(1)):long()
    print("\n\n\nSize of X and y before")
    print(X:view(-1, 1000, 128):size())
    print(y:size())
    print(sids:size())
    print("\nPerm size is: ")
    print(perm:size())
    X = X:view(-1, 1000, 128)[{{perm},{},{}}]
    y = y[{{perm},{}}]
    print(sids[{{1}, {}}])
    sids = sids[{{perm},{}}]
    print(sids[{{1}, {}}])
    print(X:size())
    print(y:size())
    print(sids:size())
    os.exit(69)
end

This prints out

Size of X and y before
99
1000
128
[torch.LongStorage of size 3]

99
1
[torch.LongStorage of size 2]

99
1
[torch.LongStorage of size 2]

Perm size is:
99
[torch.LongStorage of size 1]
5
[torch.LongStorage of size 1x1]
5
[torch.LongStorage of size 1x1]


99
1000
128
[torch.LongStorage of size 3]

99
1
[torch.LongStorage of size 2]

99
1
[torch.LongStorage of size 2]

Out of the value, I can imply that the function did not shuffle the data. How can I make it shuffle correctly, and what is the common solution in lua/torch?

解决方案

I also faced a similar issue. In the documentation, there is no shuffle function for tensors (there are for dataset loaders). I found a workaround to the problem using torch.randperm.

>>> a=torch.rand(3,5)
>>> print(a)
tensor([[0.4896, 0.3708, 0.2183, 0.8157, 0.7861],
        [0.0845, 0.7596, 0.5231, 0.4861, 0.9237],
        [0.4496, 0.5980, 0.7473, 0.2005, 0.8990]])
>>> # Row shuffling
...
>>> a=a[torch.randperm(a.size()[0])]
>>> print(a)
tensor([[0.4496, 0.5980, 0.7473, 0.2005, 0.8990],
        [0.0845, 0.7596, 0.5231, 0.4861, 0.9237],
        [0.4896, 0.3708, 0.2183, 0.8157, 0.7861]])
>>> # column shuffling
...
>>> a=a[:,torch.randperm(a.size()[1])]
>>> print(a)
tensor([[0.2005, 0.7473, 0.5980, 0.8990, 0.4496],
        [0.4861, 0.5231, 0.7596, 0.9237, 0.0845],
        [0.8157, 0.2183, 0.3708, 0.7861, 0.4896]])

I hope it answers the question!

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