size() → torch.Size使用举例

参考链接: size() → torch.Size
实验代码举例:

Microsoft Windows [版本 10.0.18363.1256]
(c) 2019 Microsoft Corporation。保留所有权利。C:\Users\chenxuqi>conda activate ssd4pytorch1_2_0(ssd4pytorch1_2_0) C:\Users\chenxuqi>python
Python 3.7.7 (default, May  6 2020, 11:45:54) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> import torch
>>>
>>> torch.manual_seed(seed=20200910)
<torch._C.Generator object at 0x00000256EC7DD330>
>>>
>>> torch.empty(3, 4, 5)
tensor([[[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.]],[[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.]],[[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.]]])
>>> a = torch.randn(2,3,4)
>>> a
tensor([[[ 0.5816,  2.0060,  1.6013, -0.6379],[-1.1943,  0.1426,  1.3612, -1.4171],[ 0.2797, -0.5316,  0.6480,  2.6538]],[[ 1.1088,  1.2914, -1.4494, -1.7273],[-0.2370, -1.7016, -0.2565,  1.4568],[ 0.7152,  1.1784,  0.0806,  0.7787]]])
>>> a.size()
torch.Size([2, 3, 4])
>>> a.size()[0]
2
>>> a.size(0)
2
>>> a.size()[1]
3
>>> a.size(1)
3
>>> a.size()[2]
4
>>> a.size(2)
4
>>> a.size()[3]
Traceback (most recent call last):File "<stdin>", line 1, in <module>
IndexError: tuple index out of range
>>> a.size(3)
Traceback (most recent call last):File "<stdin>", line 1, in <module>
IndexError: Dimension out of range (expected to be in range of [-3, 2], but got 3)
>>>
>>>

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