我正在玩弄PyTorch,目的是學習它,而且我有一個非常愚蠢的問題:如何將矩陣乘以單個矢量?如何用PyTorch中的矢量乘以矩陣
這是我已經試過:
>>> 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)
然後我第一次嘗試,a.mm(b)
,做工精細。所以問題只是我乘以一個矢量而不是一個矩陣---但我該怎麼做呢?
謝謝!爲了未來的訪問者,我寫了一些自我回答和一些補充信息。 – Nathaniel