我正在玩弄PyTorch,目的是学习它,而且我有一个非常愚蠢的问题:如何将矩阵乘以单个矢量?如何用PyTorch中的矢量乘以矩阵
这是我已经试过:
>>> import torch
>>> a = torch.rand(4,4)
>>> a
0.3162 0.4434 0.9318 0.8752
0.0129 0.8609 0.6402 0.2396
0.5720 0.7262 0.7443 0.0425
0.4561 0.1725 0.4390 0.8770
[torch.FloatTensor of size 4x4]
>>> b = torch.rand(4)
>>> b
0.1813
0.7090
0.0329
0.7591
[torch.FloatTensor of size 4]
>>> a.mm(b)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
RuntimeError: invalid argument 2: dimension 1 out of range of 1D tensor at /Users/soumith/code/builder/wheel/pytorch-src/torch/lib/TH/generic/THTensor.c:24
>>> a.mm(b.t())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
RuntimeError: t() expects a 2D tensor, but self is 1D
>>> b.mm(a)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
RuntimeError: matrices expected, got 1D, 2D tensors at /Users/soumith/code/builder/wheel/pytorch-src/torch/lib/TH/generic/THTensorMath.c:1288
>>> b.t().mm(a)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
RuntimeError: t() expects a 2D tensor, but self is 1D
在另一方面,如果我做
>>> b = torch.rand(4,2)
然后我第一次尝试,a.mm(b)
,做工精细。所以问题只是我乘以一个矢量而不是一个矩阵---但我该怎么做呢?
谢谢!为了未来的访问者,我写了一些自我回答和一些补充信息。 – Nathaniel