如何在 PyTorch 中对张量执行逐元素除法?
在本文中,我们将了解如何在 PyTorch 中执行两个张量的元素除法。要执行张量的元素划分,我们可以应用torch.div()方法。它以两个张量(除数和除数)作为输入,并返回一个具有元素除法结果的新张量。我们可以使用下面的语法来计算元素除法-
Syntax: torch.div(input, other, rounding_mode=None)
Parameters:
- input: the first input tensor (dividend).
- other: the second input tensor (divisor).
- rounding_mode: The type of rounding applied to the result.
Return: it returns a new tensor with element-wise division of the tensor input by the tensor other.
例子:
Inputs:
tensor([10., 25., 30.])
tensor([2., -5., 10.])
Output:
tensor([5., -5., 3.])
Inputs:
tensor([3., 0., 23.])
tensor([2., -5., 0.])
Output:
tensor([1.5, -0., inf])
让我们借助一些Python示例来了解张量的元素划分是如何工作的。
示例 1:
在下面的示例中,我们使用 PyTorch 方法torch.div()执行两个一维张量的元素除法。
Python3
# Python program to divide two 1D tensors
# element-wise using torch.div() method
# importing torch
import torch
# creating first tensor
A = torch.tensor([0.0312, 0.3401, 0.1645, -1.0781])
print("Tensor A:\n", A)
# creating second tensor
B = torch.tensor([-1.8584, 0.5706, -0.8994, 2.2492])
print("\nTensor B:\n", B)
# divide A by B
result = torch.div(A, B)
print("\nElement-wise Division Output:\n", result)
Python3
# Python program to divide two
# 2D tensors element-wise
# importing torch
import torch
# defining first 2D tensor
a = torch. tensor([[-1.8665, 0.6341, 0.8920],
[-0.1712, 0.3949, 1.9414],
[-1.2088, -1.0375, -1.3087],
[0.9161, -0.2972, 1.5289]])
print("Tensor a:\n", a)
# defining second 2D tensor
# b = torch.randn(4,3)
b = torch. tensor([[-0.2187, 0.5252, -0.5840],
[1.5293, -0.4514, 1.8490],
[-0.7269, -0.1561, -0.0629],
[-0.5379, -0.9751, 0.6541]])
print("\nTensor b:\n", b)
# computing element-wise division
print("\nElement-wise Division:")
result1 = torch.div(a, b)
print("\nResult:\n", result1)
result2 = torch.div(a, b, rounding_mode='trunc')
print("\nResult with rounding_mode='trunc':\n", result2)
result3 = torch.div(a, b, rounding_mode='floor')
print("\nResult with rounding_mode='floor':\n", result3)
Python3
# Python program to divide a 3D tensor by
# a 1D tensor element-wise
# Importing torch
import torch
# defining tensors
a = torch.randn(3, 2, 2)
b = torch.randn(2)
# printing the matrices
print("Tensor a :\n", a)
print("\nTensor b :\n", b)
# divide tensor a by b
result = torch.div(a, b)
print("\nElementwise Division Output :\n", result)
输出:
Tensor A:
tensor([ 0.0312, 0.3401, 0.1645, -1.0781])
Tensor B:
tensor([-1.8584, 0.5706, -0.8994, 2.2492])
Element-wise Division Output:
tensor([-0.0168, 0.5960, -0.1829, -0.4793])
示例 2:
在下面的示例中,我们使用 PyTorch 方法torch.div()执行 2D 张量与 2D 张量的元素划分。我们还应用了不同的舍入模式。
Python3
# Python program to divide two
# 2D tensors element-wise
# importing torch
import torch
# defining first 2D tensor
a = torch. tensor([[-1.8665, 0.6341, 0.8920],
[-0.1712, 0.3949, 1.9414],
[-1.2088, -1.0375, -1.3087],
[0.9161, -0.2972, 1.5289]])
print("Tensor a:\n", a)
# defining second 2D tensor
# b = torch.randn(4,3)
b = torch. tensor([[-0.2187, 0.5252, -0.5840],
[1.5293, -0.4514, 1.8490],
[-0.7269, -0.1561, -0.0629],
[-0.5379, -0.9751, 0.6541]])
print("\nTensor b:\n", b)
# computing element-wise division
print("\nElement-wise Division:")
result1 = torch.div(a, b)
print("\nResult:\n", result1)
result2 = torch.div(a, b, rounding_mode='trunc')
print("\nResult with rounding_mode='trunc':\n", result2)
result3 = torch.div(a, b, rounding_mode='floor')
print("\nResult with rounding_mode='floor':\n", result3)
输出:
Tensor a:
tensor([[-1.8665, 0.6341, 0.8920],
[-0.1712, 0.3949, 1.9414],
[-1.2088, -1.0375, -1.3087],
[ 0.9161, -0.2972, 1.5289]])
Tensor b:
tensor([[-0.2187, 0.5252, -0.5840],
[ 1.5293, -0.4514, 1.8490],
[-0.7269, -0.1561, -0.0629],
[-0.5379, -0.9751, 0.6541]])
Element-wise Division:
Result:
tensor([[ 8.5345, 1.2073, -1.5274],
[-0.1119, -0.8748, 1.0500],
[ 1.6630, 6.6464, 20.8060],
[-1.7031, 0.3048, 2.3374]])
Result with rounding_mode='trunc':
tensor([[ 8., 1., -1.],
[-0., -0., 1.],
[ 1., 6., 20.],
[-1., 0., 2.]])
Result with rounding_mode='floor':
tensor([[ 8., 1., -2.],
[-1., -1., 1.],
[ 1., 6., 20.],
[-2., 0., 2.]])
示例 3:
在下面的示例中,我们使用 PyTorch 方法torch.div()执行 3-D 张量与 1-D 张量的元素除法。
Python3
# Python program to divide a 3D tensor by
# a 1D tensor element-wise
# Importing torch
import torch
# defining tensors
a = torch.randn(3, 2, 2)
b = torch.randn(2)
# printing the matrices
print("Tensor a :\n", a)
print("\nTensor b :\n", b)
# divide tensor a by b
result = torch.div(a, b)
print("\nElementwise Division Output :\n", result)
输出:
Tensor a :
tensor([[[-0.7549, 1.8301],
[-0.5545, 1.3180]],
[[ 0.1159, 0.8394],
[ 0.0452, -1.2860]],
[[ 0.3850, -0.9654],
[-1.5530, -0.8627]]])
Tensor b :
tensor([-1.2378, 0.2153])
Elementwise Division Output :
tensor([[[ 0.6098, 8.5011],
[ 0.4480, 6.1226]],
[[-0.0937, 3.8991],
[-0.0365, -5.9739]],
[[-0.3110, -4.4844],
[ 1.2546, -4.0074]]])