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如何选择机器学习算法 - 大数据 & AI - 清泛网 - 专注C++内核技术
...here you have class A at the low end of some feature x, class B in the mid-range of feature x, and A again at the high end). One disadvantage is that they don’t support online learning, so you have to rebuild your tree when new examples come on. Another disadvantage is that they easily overfit...
How do shift operators work in Java? [duplicate]
... Java defines shift to mask (wrap around) the count down to the 0-31 range, rather than saturate to 32 (if shift by 32 left only zeroes). (using 32bit types for example, obviously.) I assume this decision was made to match the behaviour of the x86 shift & rotate instructions. By compari...
How do I read CSV data into a record array in NumPy?
...rror: 'ascii' codec can't decode byte 0xc3 in position 155: ordinal not in range(128). I have umlauts such as ä and ö in the input data.
– hhh
Jun 18 '17 at 12:00
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What is the most effective way to get the index of an iterator of an std::vector?
...pes. If the efficiency with non-random-access iterators is still in usable range, then you should use distance and document the fact that the algorithm works better with random-access iterators.
share
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HTML Form: Select-Option vs Datalist-Option
...ase you've used it with <input type="text" but you can also use it with ranges, colors, dates etc. http://demo.agektmr.com/datalist/
If using it with text input, as a type of autocomplete, then the question really is: Is it better to use a free-form text input, or a predetermined list of options...
Create a git patch from the uncommitted changes in the current working directory
...h readable if you open it with a text editor? it should be clean with no strange characters, for example if the color.diff setting is set your patch will have some 'color characters' that can make 'git apply' fail, in that case try git diff --no-color. Otherwise, it looks like an encoding problem.
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Create a GUID in Java
...lly-strong random number generator. Given that, and given the astronomical range given by so many bits in a UUID, you can generate many millions of such values in your app and still sleep well. Using one of the other variants further reduces the possibility of collisions even closer to zero because ...
Why use iterators instead of array indices?
... which is why I advocate using them even when you don't have to! Half-open ranges are a common concept, and sentinels which are never meant to be accessed directly are about as old as programming itself.
– Mark Ransom
Jan 21 '16 at 6:25
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Delete the first three rows of a dataframe in pandas
... works but returns duplicate columns in the index df=pd.DataFrame({'v':np.arange(10).tolist()*2,'g':['a']*10+['b']*10});df.groupby('g').apply(lambda x: x.iloc[3:])
– citynorman
Aug 6 '17 at 22:24
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How to set a single, main title above all the subplots with Pyplot?
...ort matplotlib.pyplot as plt
import numpy as np
fig=plt.figure()
data=np.arange(900).reshape((30,30))
for i in range(1,5):
ax=fig.add_subplot(2,2,i)
ax.imshow(data)
fig.suptitle('Main title') # or plt.suptitle('Main title')
plt.show()
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