librosa是处理音频库里的opencv,使用python脚本研究音频，先安装三方库librosa。

如下通过清华镜像源安装librosa；

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple librosa

D:\D00_Python3\D00A2_python3.7.3\install>pip install -i https://pypi.tuna.tsinghua.edu.cn/simple librosa
 
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Processing c:\users\administrator\appdata\local\pip\cache\wheels\6e\d3\47\7582e7e63ee9127f4773adeb8dcd8490771c063e2607354ba0\librosa-0.7.2-py3-none-any.whl
Requirement already satisfied: numba>=0.43.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (0.50.0)
Requirement already satisfied: joblib>=0.12 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (0.15.1)
Requirement already satisfied: resampy>=0.2.2 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (0.2.2)
Requirement already satisfied: numpy>=1.15.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (1.18.5)
Requirement already satisfied: audioread>=2.0.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (2.1.8)
Requirement already satisfied: scipy>=1.0.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (1.4.1)
Requirement already satisfied: soundfile>=0.9.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (0.10.3.post1)
Requirement already satisfied: scikit-learn!=0.19.0,>=0.14.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (0.23.1)
Requirement already satisfied: six>=1.3 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (1.15.0)
Requirement already satisfied: decorator>=3.0.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from librosa) (4.4.2)
Requirement already satisfied: setuptools in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from numba>=0.43.0->librosa) (47.1.1)
Requirement already satisfied: llvmlite<0.34,>=0.33.0.dev0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from numba>=0.43.0->librosa) (0.33.0)
Requirement already satisfied: cffi>=1.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from soundfile>=0.9.0->librosa) (1.14.0)
Requirement already satisfied: threadpoolctl>=2.0.0 in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from scikit-learn!=0.19.0,>=0.14.0->librosa) (2.1.0)
Requirement already satisfied: pycparser in d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages (from cffi>=1.0->soundfile>=0.9.0->librosa) (2.20)
Installing collected packages: librosa
Successfully installed librosa-0.7.2
 
D:\D00_Python3\D00A2_python3.7.3\install>

pip list查看三方包：

D:\D00_Python3\D00A2_python3.7.3\install>pip list
Package       Version
-------------------- ------------
absl-py       0.9.0
astor        0.8.1
audioread      2.1.8
cffi         1.14.0
decorator      4.4.2
defusedxml      0.6.0
gast         0.3.3
google-pasta     0.2.0
grpcio        1.29.0
h5py         2.10.0
importlib-metadata  1.6.1
joblib        0.15.1
Keras-Applications  1.0.8
Keras-Preprocessing 1.1.2
librosa       0.7.2
llvmlite       0.33.0
Markdown       3.2.2
networkx       2.2
numba        0.50.0
numpy        1.18.5
pip         20.1.1
protobuf       3.12.2
pycparser      2.20
resampy       0.2.2
scikit-learn     0.23.1
scipy        1.4.1
setuptools      47.1.1
six         1.15.0
SoundFile      0.10.3.post1
tensorboard     1.14.0
tensorflow      1.14.0
tensorflow-estimator 1.14.0
termcolor      1.1.0
threadpoolctl    2.1.0
Werkzeug       1.0.1
wheel        0.34.2
wrapt        1.12.1
zipp         3.1.0
 
D:\D00_Python3\D00A2_python3.7.3\install>

如上

librosa ---- 0.7.2

numba-----0.50.0

下面使用librosa，报的是numba的错误！

D:\D00_Python3\D00A2_python3.7.3\install>python -c "import librosa"
Traceback (most recent call last):
 File "<string>", line 1, in <module>
 File "D:\D00_Python3\D00A2_python3.7.3\install\lib\site-packages\librosa\__init__.py", line 12, in <module>
  from . import core
 File "D:\D00_Python3\D00A2_python3.7.3\install\lib\site-packages\librosa\core\__init__.py", line 125, in <module>
  from .time_frequency import * # pylint: disable=wildcard-import
 File "D:\D00_Python3\D00A2_python3.7.3\install\lib\site-packages\librosa\core\time_frequency.py", line 11, in <module>
  from ..util.exceptions import ParameterError
 File "D:\D00_Python3\D00A2_python3.7.3\install\lib\site-packages\librosa\util\__init__.py", line 77, in <module>
  from .utils import * # pylint: disable=wildcard-import
 File "D:\D00_Python3\D00A2_python3.7.3\install\lib\site-packages\librosa\util\utils.py", line 15, in <module>
  from .decorators import deprecated
 File "D:\D00_Python3\D00A2_python3.7.3\install\lib\site-packages\librosa\util\decorators.py", line 9, in <module>
  from numba.decorators import jit as optional_jit
ModuleNotFoundError: No module named 'numba.decorators'
 
D:\D00_Python3\D00A2_python3.7.3\install>

解决办法：

卸载numba后，重新安装降版本的numba，安装numba==0.48.0

pip uninstall numba

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple numba==0.48.0

python -c "import librosa;print(librosa.__version__) "

可以看到成功安装了正确可使用的librosa库！

D:\D00_Python3\D00A2_python3.7.3\install>pip uninstall numba
Found existing installation: numba 0.50.0
Uninstalling numba-0.50.0:
 Would remove:
  d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages\numba-0.50.0.dist-info\*
  d:\d00_python3\d00a2_python3.7.3\install\lib\site-packages\numba\*
  d:\d00_python3\d00a2_python3.7.3\install\scripts\numba
  d:\d00_python3\d00a2_python3.7.3\install\scripts\pycc
Proceed (y/n)"import librosa;print(librosa.__version__) "
0.7.2

总结