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撸起袖子加油干

最近学习人工智能，看到了玩具程序用到了binary = np.unpackbits(np.array([range(largest_number)], dtype=np.uint8).T, axis=1)这样的代码。
我想请教各位这里unpackbits的作用是什么呀。最好能举例说明下unpackbit的用法，万分感谢。

最佳答案

月排行榜 / 总排行榜

chakyam

2017-12-6 19:49:19

1. >>> help(numpy.unpackbits)
   
2. Help on built-in function unpackbits in module numpy.core.multiarray:
   
3. 
   
4. unpackbits(...)
   
5.     unpackbits(myarray, axis=None)
   
6.    
   
7.     Unpacks elements of a uint8 array into a binary-valued output array.
   
8.    
   
9.     Each element of `myarray` represents a bit-field that should be unpacked
   
10.     into a binary-valued output array. The shape of the output array is either
    
11.     1-D (if `axis` is None) or the same shape as the input array with unpacking
    
12.     done along the axis specified.
    
13.    
    
14.     Parameters
    
15.     ----------
    
16.     myarray : ndarray, uint8 type
    
17.        Input array.
    
18.     axis : int, optional
    
19.        Unpacks along this axis.
    
20.    
    
21.     Returns
    
22.     -------
    
23.     unpacked : ndarray, uint8 type
    
24.        The elements are binary-valued (0 or 1).
    
25.    
    
26.     See Also
    
27.     --------
    
28.     packbits : Packs the elements of a binary-valued array into bits in a uint8
    
29.                array.
    
30.    
    
31.     Examples
    
32.     --------
    
33.     >>> a = np.array([[2], [7], [23]], dtype=np.uint8)
    
34.     >>> a
    
35.     array([[ 2],
    
36.            [ 7],
    
37.            [23]], dtype=uint8)
    
38.     >>> b = np.unpackbits(a, axis=1)
    
39.     >>> b
    
40.     array([[0, 0, 0, 0, 0, 0, 1, 0],
    
41.            [0, 0, 0, 0, 0, 1, 1, 1],
    
42.            [0, 0, 0, 1, 0, 1, 1, 1]], dtype=uint8)
    

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yjsx86

都开始玩ai了啊 不会哦

像番茄加两个蛋

我刚刚入门，ai很牛逼的样子

chakyam

1. >>> help(numpy.unpackbits)
   
2. Help on built-in function unpackbits in module numpy.core.multiarray:
   
3. 
   
4. unpackbits(...)
   
5.     unpackbits(myarray, axis=None)
   
6.    
   
7.     Unpacks elements of a uint8 array into a binary-valued output array.
   
8.    
   
9.     Each element of `myarray` represents a bit-field that should be unpacked
   
10.     into a binary-valued output array. The shape of the output array is either
    
11.     1-D (if `axis` is None) or the same shape as the input array with unpacking
    
12.     done along the axis specified.
    
13.    
    
14.     Parameters
    
15.     ----------
    
16.     myarray : ndarray, uint8 type
    
17.        Input array.
    
18.     axis : int, optional
    
19.        Unpacks along this axis.
    
20.    
    
21.     Returns
    
22.     -------
    
23.     unpacked : ndarray, uint8 type
    
24.        The elements are binary-valued (0 or 1).
    
25.    
    
26.     See Also
    
27.     --------
    
28.     packbits : Packs the elements of a binary-valued array into bits in a uint8
    
29.                array.
    
30.    
    
31.     Examples
    
32.     --------
    
33.     >>> a = np.array([[2], [7], [23]], dtype=np.uint8)
    
34.     >>> a
    
35.     array([[ 2],
    
36.            [ 7],
    
37.            [23]], dtype=uint8)
    
38.     >>> b = np.unpackbits(a, axis=1)
    
39.     >>> b
    
40.     array([[0, 0, 0, 0, 0, 0, 1, 0],
    
41.            [0, 0, 0, 0, 0, 1, 1, 1],
    
42.            [0, 0, 0, 1, 0, 1, 1, 1]], dtype=uint8)
    

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payton24

楼上大牛，支持

撸起袖子加油干

感谢，忘了help啦