[英]I'm trying to implement strassen's algorithm using python and I'm getting a error
[英]I´m trying to implement: np.maximum.outer in Python 3x but I´m getting this error: NotImplementedError
我有一個這樣的矩陣:
RCA = pd.DataFrame(
data=[
(1,0,0,0),
(1,1,1,0),
(0,0,1,0),
(0,1,0,1),
(1,0,1,0)],
columns=['ct1','ct2','ct3','ct4'],
index=['ind_1','ind_2','ind_3','ind_4','ind_5'])
我正在嘗試計算:
norms = RCA.sum()
norm = np.maximum.outer(norms, norms)
我收到了這個錯誤:
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call last)
<ipython-input-9-4fd04a55ad8c> in <module>
4
5 norms = RCA.sum()
----> 6 norm = np.maximum.outer(norms, norms)
7 proximity = RCA.T.dot(RCA).div(norm)
8
~/opt/anaconda3/envs/py37/lib/python3.7/site-packages/pandas/core/series.py in __array_ufunc__(self, ufunc, method, *inputs, **kwargs)
746 return None
747 else:
--> 748 return construct_return(result)
749
750 def __array__(self, dtype=None) -> np.ndarray:
~/opt/anaconda3/envs/py37/lib/python3.7/site-packages/pandas/core/series.py in construct_return(result)
735 if method == "outer":
736 # GH#27198
--> 737 raise NotImplementedError
738 return result
739 return self._constructor(result, index=index, name=name, copy=False)
NotImplementedError:
這在 Python 2.7 中完美運行,但我需要在 Python 3.x 中運行它
我需要找到解決這個問題的方法。 非常感謝。
In [181]: RCA
Out[181]:
ct1 ct2 ct3 ct4
ind_1 1 0 0 0
ind_2 1 1 1 0
ind_3 0 0 1 0
ind_4 0 1 0 1
ind_5 1 0 1 0
In [182]: norms = RCA.sum()
In [183]: norms
Out[183]:
ct1 3
ct2 2
ct3 3
ct4 1
dtype: int64
In [184]: np.maximum.outer(norms,norms)
Traceback (most recent call last):
File "<ipython-input-184-d24a173874f6>", line 1, in <module>
np.maximum.outer(norms,norms)
File "/usr/local/lib/python3.8/dist-packages/pandas/core/generic.py", line 2032, in __array_ufunc__
return arraylike.array_ufunc(self, ufunc, method, *inputs, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/pandas/core/arraylike.py", line 381, in array_ufunc
result = reconstruct(result)
File "/usr/local/lib/python3.8/dist-packages/pandas/core/arraylike.py", line 334, in reconstruct
raise NotImplementedError
NotImplementedError
有時將數據幀(或系列)傳遞給 numpy 函數可以正常工作,但顯然在這里我們需要顯式使用數組值:
In [185]: norms.values
Out[185]: array([3, 2, 3, 1])
In [186]: np.maximum.outer(norms.values,norms.values)
Out[186]:
array([[3, 3, 3, 3],
[3, 2, 3, 2],
[3, 3, 3, 3],
[3, 2, 3, 1]])
實際上查看回溯,顯然pandas
ufunc
適應其自身的用途。 np.maximum(norms,norms)
有效,但顯然熊貓還沒有適應outer
方法。 [186] 是純numpy
,返回一個數組。
普通np.maximum
返回一個系列:
In [192]: np.maximum(norms,norms)
Out[192]:
ct1 3
ct2 2
ct3 3
ct4 1
dtype: int64
outer
返回一個二維數組,用pandas
術語來說,它是一個數據框,而不是一個系列。 這可以解釋為什么 pandas 沒有實現outer
。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.