torch张量中随机取2个数
时间: 2024-04-30 11:23:45 浏览: 149
可以使用torch.randperm(n)函数从0到n-1中随机选择n个不同的整数,并取前两个作为索引,然后从张量中取出对应位置的值。示例如下:
```python
import torch
x = torch.tensor([1, 2, 3, 4, 5])
indices = torch.randperm(len(x))[:2]
print(x[indices])
```
输出结果可能为:
```
tensor([2, 4])
```
相关问题
随机生成torch张量
要随机生成torch张量,可以使用torch.randn()函数生成服从标准正态分布的随机数张量。该函数可以指定生成张量的形状,例如torch.randn(2,3)会生成一个形状为(2,3)的张量,其中的元素服从标准正态分布。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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- *3* [PyTorch-1.10(三)--torch张量随机生成、采样](https://blog.csdn.net/weixin_43145427/article/details/124683835)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
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torch生成随机张量
在PyTorch中,你可以使用以下两种方式来生成随机张量:
1. 使用`torch.rand()`[^2]函数:
```python
import torch
random_tensor = torch.rand(2, 3) # 创建一个2行3列的张量,元素在[0, 1)之间均匀分布
print(random_tensor)
```
2. 使用`torch.randn()`:
```python
random.randn_()函数会生成一个具有正态分布(平均值0,标准差1)的随机张量。例如:
data = torch.randn(2, 3) # 创建2行3列张量,元素服从标准正态分布
print(data)
```
如果你想指定分布的均值和方差,可以传递额外参数给`torch.randn()`,如`torch.randn(2, 3, mean=0.0, std=1.0)`。
3. 控制随机数生成的种子:
```python
# 设置随机数种子以获得可重复的结果
torch.random.seed(100) # 或者使用torch.random.manual_seed()
print('随机数种子:', torch.random.get_rng_state().seed)
```
注意,`initial_seed()`返回的是一个表示当前随机状态的种子,而`get_rng_state().seed`则是实际应用后的随机数种子。
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