NameError：未定义全局名称“numpy”

我正在尝试通过收集 essentia（一个 MIR 库）函数来编写一个特征提取器。 流程图如下：单独的特征提取，池化，PoolAggregator，使用poolAggregator连接形成整个特征列表np.concatenate

即使不导入 numpy，该脚本也可以在 ipython 笔记本下运行良好。我只是聚合从上一阶段获得的数组或浮点数，但错误消息："NameError: global name 'numpy' is not defined" shows.

我尝试将“import numpy as np”放在模块的顶部：

import numpy as np
def featureExtractor(path):

或在函数中：

def featureExtractor(path):
    import numpy as np

或者在主文件的模块之外：

import numpy as np
from featureExtractor import featureExtractor

这些都不能解决问题，请帮帮我。

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

然后我在主文件中命令：

path = "/~/Downloads/~.wav"
from featureExtractor import featureExtractor
featureExtractor(path)

我收到错误：

---------------------------------------------------------------------------
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

无论我将命令放在哪里，我都会遇到相同的错误（如上所述）

import numpy as np

简单地尝试一下

import numpy

在文件顶部/~/ipython_notebook/featureExtractor.py

看来你的代码期望numpy并不是np作为模块名称。