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如何选择机器学习算法 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...交叉验证中表现最好的。倘若你只是想针对你的问题寻找一个“足够好”的算法，或者一个起步点，这里给出了一些我觉得这些年用着还不错的常规指南。
How large is your training set?
训练集有多大？
If your training set is sm...
Redirect stdout to a file in Python?
...pt on Windows using just script's name
– Piotr Dobrogost
Oct 4 '12 at 11:00
7
It doesn't work wit...
一分钟读懂低功耗蓝牙(BLE) MTU交换数据包 - 创客硬件开发 - 清泛IT社区，...
... * MTU: 最大传输单元（MAXIMUM TRANSMISSION UNIT） ， 指在一个PDU （Protocol Data Unit： 协议数据单元，在一个传输单元中的有效传输数据）能够传输的最大数据量（多少字节可以一次性传输到对方）。
* MTU 交换是为了在...
Python: Get relative path from comparing two absolute paths
...
os.path.commonprefix() and os.path.relpath() are your friends:
>>> print os.path.commonprefix(['/usr/var/log', '/usr/var/security'])
'/usr/var'
>>> print os.path.commonprefix(['/tmp', '/usr/var']) # No com...
How can I create directories recursively? [duplicate]
...
os.makedirs is what you need. For chmod or chown you'll have to use os.walk and use it on every file/dir yourself.
share
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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...交叉验证中表现最好的。倘若你只是想针对你的问题寻找一个“足够好”的算法，或者一个起步点，这里给出了一些我觉得这些年用着还不错的常规指南。
How large is your training set?
训练集有多大？
If your training set is sm...
How do I check if I'm running on Windows in Python? [duplicate]
...e platform module but it says it returns 'Windows' and it's returning 'Microsoft' on my machine. I notice in another thread here on stackoverflow it returns 'Vista' sometimes.
...
How to get the filename without the extension from a path in Python?
...
Getting the name of the file without the extension:
import os
print(os.path.splitext("/path/to/some/file.txt")[0])
Prints:
/path/to/some/file
Documentation for os.path.splitext.
Important Note: If the filename has multiple dots, only the extension after the last one is removed....
What to do on TransactionTooLargeException
...t of operations pending
How to handle when you get this exception
If possible, split the big operation in to small chunks, for example, instead of calling applyBatch() with 1000 operations, call it with 100 each.
Do not exchange huge data (>1MB) between services and application
I dont know...
Python subprocess/Popen with a modified environment
...
I think os.environ.copy() is better if you don't intend to modify the os.environ for the current process:
import subprocess, os
my_env = os.environ.copy()
my_env["PATH"] = "/usr/sbin:/sbin:" + my_env["PATH"]
subprocess.Popen(my_comm...