Python NameError：未定义全局名称“numpy”
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NameError: global name 'numpy' is not defined
提问by Francis
I am trying to write a feature extractor by gathering essentia's (a MIR library) functions.
The flow chart is like: individual feature extraction, pool, PoolAggregator, concatenate to form the whole feature list from poolAggregator using np.concatenate
我正在尝试通过收集 essentia 的（一个 MIR 库）函数来编写一个特征提取器。流程图是这样的：单个特征提取，池化，PoolAggregator，使用poolAggregator从poolAggregator连接形成整个特征列表np.concatenate
The script runs well under ipython notebook even without importing numpy.I'm just congregating the array or float number I got from the previous stage but the error message: "NameError: global name 'numpy' is not defined"shows.
即使不导入 numpy，该脚本也能在 ipython notebook 下运行良好。我只是聚集了我从上一阶段得到的数组或浮点数，但错误消息："NameError: global name 'numpy' is not defined"显示。
I've tried to put "import numpy as np" at the top of the module:
我试图将“import numpy as np”放在模块的顶部：
import numpy as np
def featureExtractor(path):
or in the function:
或在函数中：
def featureExtractor(path):
import numpy as np
or outside the module in the main file:
或在主文件中的模块之外：
import numpy as np
from featureExtractor import featureExtractor
None of these can solve it, please help me.
这些都不能解决，请帮帮我。
The following is the script:
以下是脚本：
from essentia.standard import *
import essentia
def featureExtractor(path):
loader = MonoLoader(filename = path)
x = loader()
pool = essentia.Pool()
spectrum = Spectrum()
w = Windowing(type = 'hann')
# Create needed objects
mfcc = MFCC()
centroid = Centroid()
for frame in FrameGenerator(x, frameSize = 1024, hopSize = 512):
mfcc_bands, mfcc_coeffs = mfcc(spectrum(w(frame))) # output: vector_real
spec_centroid = centroid(spectrum(w(frame))) # output: real
pool.add('lowlevel.mfcc', mfcc_coeffs)
pool.add('lowlevel.centroid', spec_centroid)
aggrPool = PoolAggregator(defaultStats = [ 'mean', 'var' ])(pool)
# calculate mean and var for each feature
# build a feature vector of type array
list = ['lowlevel.centroid.mean', 'lowlevel.centroid.var',
'lowlevel.mfcc.mean', 'lowlevel.mfcc.var']
feature_vec = []
for name in list:
feature = aggrPool[name]
if type(feature) != float: # for those type == array
feature_vec = np.concatenate([feature_vec,feature], axis = 0)
else: # for those type == float
feature_vec.append(feature)
return feature_vec
Then I command in the main file:
然后我在主文件中命令：
path = "/~/Downloads/~.wav"
from featureExtractor import featureExtractor
featureExtractor(path)
I got the error:
我得到了错误：
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-109-40b5bbac9b17> in <module>()
1 from featureExtractor import featureExtractor
2
----> 3 featureExtractor(path)
/~/ipython_notebook/featureExtractor.py in featureExtractor(path)
66 for name in list:
67 feature = aggrPool[name]
---> 68 if type(feature) != float: # for those type == array
69 feature_vec = np.concatenate([feature_vec,feature], axis = 0)
70 else: # for those type == float
NameError: global name 'numpy' is not defined
And I got the same error no matter where I put the command (as described in above)
无论我把命令放在哪里，我都会遇到同样的错误（如上所述）
import numpy as np
采纳答案by Pierre de Buyl
Try simply
简单尝试
import numpy
at the top of the file /~/ipython_notebook/featureExtractor.py
在文件顶部 /~/ipython_notebook/featureExtractor.py
It seems that your code expect numpyand not npas the module name.
似乎您的代码期望numpy而不是np作为模块名称。
