【开源数据下载全步骤】利用Pytorch下载开源数据到本地，以Speech Command为例

找开源数据来练练手，虽然可以直接通过pytorch或TensorFlow加载使用，但感觉太麻烦了，所以想直接下载到本地使用。上网直接搜数据集没有那种直接下载的链接，最后发现可以直接通过pytorch或是TensorFlow下载。下面以pytorch下载Speech Command数据集为例。

如Speech Command数据集

 拖到下面的Dataset Loader，根据需要选择对应的下载路径。本例使用pytorch。

 2、找到对应的代码仓

root (str or Path) – 
Path to the directory where the dataset is found or downloaded.

url (str, optional) – 
The URL to download the dataset from, or the type of the dataset to download. 
Allowed type values are "speech_commands_v0.01" and "speech_commands_v0.02" 
(default: "speech_commands_v0.02")

folder_in_archive (str, optional) – 
The top-level directory of the dataset. 
(default: "SpeechCommands")

download (bool, optional) – 
Whether to download the dataset if it is not found at root path. 
(default: False).

subset (str or None, optional) – 
Select a subset of the dataset [None, “training”, “validation”, “testing”]. 
None means the whole dataset. 
“validation” and “testing” are defined in “validation_list.txt” and “testing_list.txt”, respectively, and “training” is the rest. 
Details for the files “validation_list.txt” and “testing_list.txt” are explained in the README of the dataset and in the introduction of Section 7 of the original paper and its reference 12. 
(Default: None)

根据上面所说的调用，即可下载

下载数据
from torchaudio import datasets

datasets.SPEECHCOMMANDS(
    root="./data",                         # 你保存数据的路径
    url = 'speech_commands_v0.02',         # 下载数据版本URL
    folder_in_archive = 'SpeechCommands',  
    download = True                        # 这个记得选True 
)

然后就等下载就行了（要等一段时间，不行就科学上网）