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In Vim, I'd like to go back a word. The opposite of `w`
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edited Mar 17 '19 at 5:41
daaawx
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How do I create test and train samples from one dataframe with pandas?
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I would just use numpy's randn:
In [11]: df = pd.DataFrame(np.random.randn(100, 2))
In [12]: msk = np.random.rand(len(df)) < 0.8
In [13]: train = df[msk]
In [14]: test = df[~msk]
And just to see this has worked:
In [15]: len(test)
Out[15]: 21
In [16]:...
Create a custom event in Java
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You probably want to look into the observer pattern.
Here's some sample code to get yourself st...
Javascript !instanceof If Statement
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Enclose in parentheses and negate on the outside.
if(!(obj instanceof Array)) {
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}
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Unexpected character encountered while parsing value
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15 Answers
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call a static method inside a class?
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edited Oct 30 '13 at 1:40
answered Feb 4 '10 at 23:33
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What's wrong with nullable columns in composite primary keys?
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Primary keys are for uniquely identifying rows. This is done by comparing all parts of a key to ...
write a shell script to ssh to a remote machine and execute commands
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There are multiple remote linux machines, and I need to write a shell script which will exe...
Does a finally block run even if you throw a new Exception?
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Yes, the finally blocks always runs... except when:
The thread running the try-catch-finally...
What is the difference between git clone and checkout?
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edited Oct 27 '17 at 9:36
WesternGun
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answered Sep 4...