ValueError:操作数不能与形状一起广播-inverse_transform- Python [英] ValueError: operands could not be broadcast together with shapes - inverse_transform- Python
问题描述
我知道 ValueError
问题已经问过许多。我仍在努力寻找答案,因为我在代码中使用了 inverse_transform
。
I know ValueError
question has been asked many times. I am still struggling to find an answer because I am using inverse_transform
in my code.
说我有一个数组 a
a.shape
> (100,20)
和另一个数组 b
b.shape
> (100,3)
当我执行 np.concatenate
,
hat = np.concatenate((a, b), axis=1)
现在 hat
的形状是
hat.shape
(100,23)
之后,我尝试执行此操作
After this, I tried to do this,
inversed_hat = scaler.inverse_transform(hat)
执行此操作时,出现错误:
When I do this, I am getting an error:
ValueError:操作数不能与形状(100,23)(25,)(100,23)一起广播
ValueError: operands could not be broadcast together with shapes (100,23) (25,) (100,23)
此广播错误是否在 inverse_transform
中?任何建议都会有所帮助。
Is this broadcast error in inverse_transform
? Any suggestion will be helpful. Thanks in advance!
推荐答案
尽管您未指定,但我假设您使用的是<$ c $ scikit Learn的中的c> inverse_transform()。您需要先拟合数据。 StandardScaler
Although you didn't specify, I'm assuming you are using . You need to fit the data first.inverse_transform()
from scikit learn's StandardScaler
import numpy as np
from sklearn.preprocessing import MinMaxScaler
In [1]: arr_a = np.random.randn(5*3).reshape((5, 3))
In [2]: arr_b = np.random.randn(5*2).reshape((5, 2))
In [3]: arr = np.concatenate((arr_a, arr_b), axis=1)
In [4]: scaler = MinMaxScaler(feature_range=(0, 1)).fit(arr)
In [5]: scaler.inverse_transform(arr)
Out[5]:
array([[ 0.19981115, 0.34855509, -1.02999482, -1.61848816, -0.26005923],
[-0.81813499, 0.09873672, 1.53824716, -0.61643731, -0.70210801],
[-0.45077786, 0.31584348, 0.98219019, -1.51364126, 0.69791054],
[ 0.43664741, -0.16763207, -0.26148908, -2.13395823, 0.48079204],
[-0.37367434, -0.16067958, -3.20451107, -0.76465428, 1.09761543]])
In [6]: new_arr = scaler.inverse_transform(arr)
In [7]: new_arr.shape == arr.shape
Out[7]: True
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